Octoprint (#796)

* Octoprint: GUI for CA file, improvements

* Octoprint: Add GUI for Bonjour lookup, bugfixes

* Octoprint: Bonjour browser: Cleanup Perl interaction

* Octoprint: Bonjour: Perform several broadcast, UI fixes

* Octoprint: Add files to localization list

* Http: Disable CA File setting on SSL backends that don't support it

15 files changed, 549 insertions, 199 deletions

diff --git a/xs/src/slic3r/GUI/BonjourDialog.cpp b/xs/src/slic3r/GUI/BonjourDialog.cpp
new file mode 100644
index 000000000..34fac9a91
--- /dev/null
+++ b/xs/src/slic3r/GUI/BonjourDialog.cpp
@@ -0,0 +1,200 @@
+#include "slic3r/Utils/Bonjour.hpp"   // On Windows, boost needs to be included before wxWidgets headers
+
+#include "BonjourDialog.hpp"
+
+#include <set>
+#include <mutex>
+
+#include <wx/sizer.h>
+#include <wx/button.h>
+#include <wx/listctrl.h>
+#include <wx/stattext.h>
+#include <wx/timer.h>
+
+#include "slic3r/GUI/GUI.hpp"
+#include "slic3r/Utils/Bonjour.hpp"
+
+
+namespace Slic3r {
+
+
+struct BonjourReplyEvent : public wxEvent
+{
+	BonjourReply reply;
+
+	BonjourReplyEvent(wxEventType eventType, int winid, BonjourReply &&reply) :
+		wxEvent(winid, eventType),
+		reply(std::move(reply))
+	{}
+
+	virtual wxEvent *Clone() const
+	{
+		return new BonjourReplyEvent(*this);
+	}
+};
+
+wxDEFINE_EVENT(EVT_BONJOUR_REPLY, BonjourReplyEvent);
+
+wxDECLARE_EVENT(EVT_BONJOUR_COMPLETE, wxCommandEvent);
+wxDEFINE_EVENT(EVT_BONJOUR_COMPLETE, wxCommandEvent);
+
+class ReplySet: public std::set<BonjourReply> {};
+
+struct LifetimeGuard
+{
+	std::mutex mutex;
+	BonjourDialog *dialog;
+
+	LifetimeGuard(BonjourDialog *dialog) : dialog(dialog) {}
+};
+
+
+BonjourDialog::BonjourDialog(wxWindow *parent) :
+	wxDialog(parent, wxID_ANY, _(L("Network lookup"))),
+	list(new wxListView(this, wxID_ANY, wxDefaultPosition, wxSize(800, 300))),
+	replies(new ReplySet),
+	label(new wxStaticText(this, wxID_ANY, "")),
+	timer(new wxTimer()),
+	timer_state(0)
+{
+	wxBoxSizer *vsizer = new wxBoxSizer(wxVERTICAL);
+
+	vsizer->Add(label, 0, wxEXPAND | wxTOP | wxLEFT | wxRIGHT, 10);
+
+	list->SetSingleStyle(wxLC_SINGLE_SEL);
+	list->SetSingleStyle(wxLC_SORT_DESCENDING);
+	list->AppendColumn(_(L("Address")), wxLIST_FORMAT_LEFT, 50);
+	list->AppendColumn(_(L("Hostname")), wxLIST_FORMAT_LEFT, 100);
+	list->AppendColumn(_(L("Service name")), wxLIST_FORMAT_LEFT, 200);
+	list->AppendColumn(_(L("OctoPrint version")), wxLIST_FORMAT_LEFT, 50);
+
+	vsizer->Add(list, 1, wxEXPAND | wxALL, 10);
+
+	wxBoxSizer *button_sizer = new wxBoxSizer(wxHORIZONTAL);
+	button_sizer->Add(new wxButton(this, wxID_OK, "OK"), 0, wxALL, 10);
+	button_sizer->Add(new wxButton(this, wxID_CANCEL, "Cancel"), 0, wxALL, 10);
+	// ^ Note: The Ok/Cancel labels are translated by wxWidgets
+
+	vsizer->Add(button_sizer, 0, wxALIGN_CENTER);
+	SetSizerAndFit(vsizer);
+
+	Bind(EVT_BONJOUR_REPLY, &BonjourDialog::on_reply, this);
+
+	Bind(EVT_BONJOUR_COMPLETE, [this](wxCommandEvent &) {
+		this->timer_state = 0;
+	});
+
+	Bind(wxEVT_TIMER, &BonjourDialog::on_timer, this);
+}
+
+BonjourDialog::~BonjourDialog()
+{
+	// Needed bacuse of forward defs
+}
+
+bool BonjourDialog::show_and_lookup()
+{
+	Show();   // Because we need GetId() to work before ShowModal()
+
+	timer->Stop();
+	timer->SetOwner(this);
+	timer_state = 1;
+	timer->Start(1000);
+	wxTimerEvent evt_dummy;
+	on_timer(evt_dummy);
+
+	// The background thread needs to queue messages for this dialog
+	// and for that it needs a valid pointer to it (mandated by the wxWidgets API).
+	// Here we put the pointer under a shared_ptr and protect it by a mutex,
+	// so that both threads can access it safely.
+	auto dguard = std::make_shared<LifetimeGuard>(this);
+
+	bonjour = std::move(Bonjour("octoprint")
+		.set_retries(3)
+		.set_timeout(4)
+		.on_reply([dguard](BonjourReply &&reply) {
+			std::lock_guard<std::mutex> lock_guard(dguard->mutex);
+			auto dialog = dguard->dialog;
+			if (dialog != nullptr) {
+				auto evt = new BonjourReplyEvent(EVT_BONJOUR_REPLY, dialog->GetId(), std::move(reply));
+				wxQueueEvent(dialog, evt);
+			}
+		})
+		.on_complete([dguard]() {
+			std::lock_guard<std::mutex> lock_guard(dguard->mutex);
+			auto dialog = dguard->dialog;
+			if (dialog != nullptr) {
+				auto evt = new wxCommandEvent(EVT_BONJOUR_COMPLETE, dialog->GetId());
+				wxQueueEvent(dialog, evt);
+			}
+		})
+		.lookup()
+	);
+
+	bool res = ShowModal() == wxID_OK && list->GetFirstSelected() >= 0;
+	{
+		// Tell the background thread the dialog is going away...
+		std::lock_guard<std::mutex> lock_guard(dguard->mutex);
+		dguard->dialog = nullptr;
+	}
+	return res;
+}
+
+wxString BonjourDialog::get_selected() const
+{
+	auto sel = list->GetFirstSelected();
+	return sel >= 0 ? list->GetItemText(sel) : wxString();
+}
+
+
+// Private
+
+void BonjourDialog::on_reply(BonjourReplyEvent &e)
+{
+	if (replies->find(e.reply) != replies->end()) {
+		// We already have this reply
+		return;
+	}
+
+	replies->insert(std::move(e.reply));
+
+	auto selected = get_selected();
+	list->DeleteAllItems();
+
+	// The whole list is recreated so that we benefit from it already being sorted in the set.
+	// (And also because wxListView's sorting API is bananas.)
+	for (const auto &reply : *replies) {
+		auto item = list->InsertItem(0, reply.full_address);
+		list->SetItem(item, 1, reply.hostname);
+		list->SetItem(item, 2, reply.service_name);
+		list->SetItem(item, 3, reply.version);
+	}
+
+	for (int i = 0; i < 4; i++) {
+		this->list->SetColumnWidth(i, wxLIST_AUTOSIZE);
+		if (this->list->GetColumnWidth(i) < 100) { this->list->SetColumnWidth(i, 100); }
+	}
+
+	if (!selected.IsEmpty()) {
+		// Attempt to preserve selection
+		auto hit = list->FindItem(-1, selected);
+		if (hit >= 0) { list->SetItemState(hit, wxLIST_STATE_SELECTED, wxLIST_STATE_SELECTED); }
+	}
+}
+
+void BonjourDialog::on_timer(wxTimerEvent &)
+{
+	const auto search_str = _(L("Searching for devices"));
+
+	if (timer_state > 0) {
+		const std::string dots(timer_state, '.');
+		label->SetLabel(wxString::Format("%s %s", search_str, dots));
+		timer_state = (timer_state) % 3 + 1;
+	} else {
+		label->SetLabel(wxString::Format("%s: %s", search_str, _(L("Finished."))));
+		timer->Stop();
+	}
+}
+
+
+}
diff --git a/xs/src/slic3r/GUI/BonjourDialog.hpp b/xs/src/slic3r/GUI/BonjourDialog.hpp
new file mode 100644
index 000000000..e3f53790b
--- /dev/null
+++ b/xs/src/slic3r/GUI/BonjourDialog.hpp
@@ -0,0 +1,49 @@
+#ifndef slic3r_BonjourDialog_hpp_
+#define slic3r_BonjourDialog_hpp_
+
+#include <memory>
+
+#include <wx/dialog.h>
+
+class wxListView;
+class wxStaticText;
+class wxTimer;
+class wxTimerEvent;
+
+
+namespace Slic3r {
+
+class Bonjour;
+class BonjourReplyEvent;
+class ReplySet;
+
+
+class BonjourDialog: public wxDialog
+{
+public:
+	BonjourDialog(wxWindow *parent);
+	BonjourDialog(BonjourDialog &&) = delete;
+	BonjourDialog(const BonjourDialog &) = delete;
+	BonjourDialog &operator=(BonjourDialog &&) = delete;
+	BonjourDialog &operator=(const BonjourDialog &) = delete;
+	~BonjourDialog();
+
+	bool show_and_lookup();
+	wxString get_selected() const;
+private:
+	wxListView *list;
+	std::unique_ptr<ReplySet> replies;
+	wxStaticText *label;
+	std::shared_ptr<Bonjour> bonjour;
+	std::unique_ptr<wxTimer> timer;
+	unsigned timer_state;
+
+	void on_reply(BonjourReplyEvent &);
+	void on_timer(wxTimerEvent &);
+};
+
+
+
+}
+
+#endif
diff --git a/xs/src/slic3r/GUI/Field.cpp b/xs/src/slic3r/GUI/Field.cpp
index aed7ba12f..c2fc5e4e4 100644
--- a/xs/src/slic3r/GUI/Field.cpp
+++ b/xs/src/slic3r/GUI/Field.cpp
@@ -261,7 +261,7 @@ void SpinCtrl::BUILD() {
 // 		# when it was changed from the text control, so the on_change callback
 // 		# gets the old one, and on_kill_focus resets the control to the old value.
 // 		# As a workaround, we get the new value from $event->GetString and store
-// 		# here temporarily so that we can return it from $self->get_value
+// 		# here temporarily so that we can return it from $self->get_value
 		std::string value = e.GetString().utf8_str().data();
 		if (is_matched(value, "^\\d+$"))
 			tmp_value = std::stoi(value);
@@ -365,9 +365,9 @@ void Choice::set_selection()
 	}
 }
 
-void Choice::set_value(const std::string value)  //! Redundant?
+void Choice::set_value(const std::string value, bool change_event)  //! Redundant?
 {
-	m_disable_change_event = true;
+	m_disable_change_event = !change_event;
 
 	size_t idx=0;
 	for (auto el : m_opt.enum_values)
@@ -384,9 +384,9 @@ void Choice::set_value(const std::string value)  //! Redundant?
 	m_disable_change_event = false;
 }
 
-void Choice::set_value(boost::any value)
+void Choice::set_value(boost::any value, bool change_event)
 {
-	m_disable_change_event = true;
+	m_disable_change_event = !change_event;
 
 	switch (m_opt.type){
 	case coInt:
@@ -429,7 +429,7 @@ void Choice::set_values(const std::vector<std::string> values)
 		return;
 	m_disable_change_event = true;
 
-// 	# it looks that Clear() also clears the text field in recent wxWidgets versions,
+// 	# it looks that Clear() also clears the text field in recent wxWidgets versions,
 // 	# but we want to preserve it
 	auto ww = dynamic_cast<wxComboBox*>(window);
 	auto value = ww->GetValue();
@@ -541,9 +541,9 @@ void PointCtrl::BUILD()
 	y_textctrl->SetToolTip(get_tooltip_text(X+", "+Y));
 }
 
-void PointCtrl::set_value(const Pointf value)
+void PointCtrl::set_value(const Pointf value, bool change_event)
 {
-	m_disable_change_event = true;
+	m_disable_change_event = !change_event;
 
 	double val = value.x;
 	x_textctrl->SetValue(val - int(val) == 0 ? wxString::Format(_T("%i"), int(val)) : wxNumberFormatter::ToString(val, 2, wxNumberFormatter::Style_None));
@@ -553,7 +553,7 @@ void PointCtrl::set_value(const Pointf value)
 	m_disable_change_event = false;
 }
 
-void PointCtrl::set_value(boost::any value)
+void PointCtrl::set_value(boost::any value, bool change_event)
 {
 	Pointf pt;
 	Pointf *ptf = boost::any_cast<Pointf>(&value);
@@ -579,7 +579,7 @@ void PointCtrl::set_value(boost::any value)
 // 			return;
 // 		}		
 // 	}	
-	set_value(pt);
+	set_value(pt, change_event);
 }
 
 boost::any PointCtrl::get_value()
diff --git a/xs/src/slic3r/GUI/Field.hpp b/xs/src/slic3r/GUI/Field.hpp
index db8ad4c9f..2ddb5d9f8 100644
--- a/xs/src/slic3r/GUI/Field.hpp
+++ b/xs/src/slic3r/GUI/Field.hpp
@@ -78,7 +78,7 @@ public:
     /// Sets a value for this control.
     /// subclasses should overload with a specific version
     /// Postcondition: Method does not fire the on_change event.
-    virtual void		set_value(boost::any value) = 0;
+    virtual void		set_value(boost::any value, bool change_event) = 0;
     
     /// Gets a boost::any representing this control.
     /// subclasses should overload with a specific version
@@ -134,13 +134,13 @@ public:
     void BUILD();
     wxWindow* window {nullptr};
 
-    virtual void	set_value(std::string value) {
-		m_disable_change_event = true;
+    virtual void	set_value(std::string value, bool change_event = false) {
+		m_disable_change_event = !change_event;
         dynamic_cast<wxTextCtrl*>(window)->SetValue(wxString(value));
 		m_disable_change_event = false;
     }
-    virtual void	set_value(boost::any value) {
-		m_disable_change_event = true;
+    virtual void	set_value(boost::any value, bool change_event = false) {
+		m_disable_change_event = !change_event;
 		dynamic_cast<wxTextCtrl*>(window)->SetValue(boost::any_cast<wxString>(value));
 		m_disable_change_event = false;
     }
@@ -161,13 +161,13 @@ public:
 	wxWindow*		window{ nullptr };
 	void			BUILD() override;
 
-	void			set_value(const bool value) {
-		m_disable_change_event = true;
+	void			set_value(const bool value, bool change_event = false) {
+		m_disable_change_event = !change_event;
 		dynamic_cast<wxCheckBox*>(window)->SetValue(value);
 		m_disable_change_event = false;
 	}
-	void			set_value(boost::any value) {
-		m_disable_change_event = true;
+	void			set_value(boost::any value, bool change_event = false) {
+		m_disable_change_event = !change_event;
 		dynamic_cast<wxCheckBox*>(window)->SetValue(boost::any_cast<bool>(value));
 		m_disable_change_event = false;
 	}
@@ -189,13 +189,13 @@ public:
 	wxWindow*		window{ nullptr };
 	void			BUILD() override;
 
-	void			set_value(const std::string value) {
-		m_disable_change_event = true;
+	void			set_value(const std::string value, bool change_event = false) {
+		m_disable_change_event = !change_event;
 		dynamic_cast<wxSpinCtrl*>(window)->SetValue(value);
 		m_disable_change_event = false;
 	}
-	void			set_value(boost::any value) {
-		m_disable_change_event = true;
+	void			set_value(boost::any value, bool change_event = false) {
+		m_disable_change_event = !change_event;
 		dynamic_cast<wxSpinCtrl*>(window)->SetValue(boost::any_cast<int>(value));
 		m_disable_change_event = false;
 	}
@@ -218,8 +218,8 @@ public:
 	void			BUILD() override;
 
 	void			set_selection();
-	void			set_value(const std::string value);
-	void			set_value(boost::any value);
+	void			set_value(const std::string value, bool change_event = false);
+	void			set_value(boost::any value, bool change_event = false);
 	void			set_values(const std::vector<std::string> values);
 	boost::any		get_value() override;
 
@@ -237,13 +237,13 @@ public:
 	wxWindow*		window{ nullptr };
 	void			BUILD()  override;
 
-	void			set_value(const std::string value) {
-		m_disable_change_event = true;
+	void			set_value(const std::string value, bool change_event = false) {
+		m_disable_change_event = !change_event;
 		dynamic_cast<wxColourPickerCtrl*>(window)->SetColour(value);
 		m_disable_change_event = false;
 	 	}
-	void			set_value(boost::any value) {
-		m_disable_change_event = true;
+	void			set_value(boost::any value, bool change_event = false) {
+		m_disable_change_event = !change_event;
 		dynamic_cast<wxColourPickerCtrl*>(window)->SetColour(boost::any_cast<wxString>(value));
 		m_disable_change_event = false;
 	}
@@ -267,8 +267,8 @@ public:
 
 	void			BUILD()  override;
 
-	void			set_value(const Pointf value);
-	void			set_value(boost::any value);
+	void			set_value(const Pointf value, bool change_event = false);
+	void			set_value(boost::any value, bool change_event = false);
 	boost::any		get_value() override;
 
 	void			enable() override {
diff --git a/xs/src/slic3r/GUI/GUI.cpp b/xs/src/slic3r/GUI/GUI.cpp
index 262d41a79..0410b7969 100644
--- a/xs/src/slic3r/GUI/GUI.cpp
+++ b/xs/src/slic3r/GUI/GUI.cpp
@@ -358,24 +358,17 @@ void open_preferences_dialog(int event_preferences)
 	dlg->ShowModal();
 }
 
-void create_preset_tabs(bool no_controller, bool is_disabled_button_browse, bool is_user_agent,
-						int event_value_change, int event_presets_changed,
-						int event_button_browse, int event_button_test)
+void create_preset_tabs(bool no_controller, int event_value_change, int event_presets_changed)
 {	
 	add_created_tab(new TabPrint	(g_wxTabPanel, no_controller));
 	add_created_tab(new TabFilament	(g_wxTabPanel, no_controller));
-	add_created_tab(new TabPrinter	(g_wxTabPanel, no_controller, is_disabled_button_browse, is_user_agent));
+	add_created_tab(new TabPrinter	(g_wxTabPanel, no_controller));
 	for (size_t i = 0; i < g_wxTabPanel->GetPageCount(); ++ i) {
 		Tab *tab = dynamic_cast<Tab*>(g_wxTabPanel->GetPage(i));
 		if (! tab)
 			continue;
 		tab->set_event_value_change(wxEventType(event_value_change));
 		tab->set_event_presets_changed(wxEventType(event_presets_changed));
-		if (tab->name() == "printer"){
-			TabPrinter* tab_printer = static_cast<TabPrinter*>(tab);
-			tab_printer->set_event_button_browse(wxEventType(event_button_browse));
-			tab_printer->set_event_button_test(wxEventType(event_button_test));
-		}
 	}
 }
 
@@ -591,19 +584,6 @@ wxString from_u8(const std::string &str)
 	return wxString::FromUTF8(str.c_str());
 }
 
-wxWindow *get_widget_by_id(int id)
-{
-    if (g_wxMainFrame == nullptr) {
-        throw std::runtime_error("Main frame not set");
-    }
-
-    wxWindow *window = g_wxMainFrame->FindWindow(id);
-    if (window == nullptr) {
-        throw std::runtime_error((boost::format("Could not find widget by ID: %1%") % id).str());
-    }
-
-    return window;
-}
 
 void add_frequently_changed_parameters(wxWindow* parent, wxBoxSizer* sizer, wxFlexGridSizer* preset_sizer)
 {
diff --git a/xs/src/slic3r/GUI/GUI.hpp b/xs/src/slic3r/GUI/GUI.hpp
index 2baa10cb9..084b6de46 100644
--- a/xs/src/slic3r/GUI/GUI.hpp
+++ b/xs/src/slic3r/GUI/GUI.hpp
@@ -86,9 +86,7 @@ void add_debug_menu(wxMenuBar *menu, int event_language_change);
 void open_preferences_dialog(int event_preferences);
 
 // Create a new preset tab (print, filament and printer),
-void create_preset_tabs(bool no_controller, bool is_disabled_button_browse,	bool is_user_agent,
-						int event_value_change, int event_presets_changed,
-						int event_button_browse, int event_button_test);
+void create_preset_tabs(bool no_controller, int event_value_change, int event_presets_changed);
 TabIface* get_preset_tab_iface(char *name);
 
 // add it at the end of the tab panel.
@@ -127,7 +125,6 @@ wxString	L_str(const std::string &str);
 // Return wxString from std::string in UTF8
 wxString	from_u8(const std::string &str);
 
-wxWindow *get_widget_by_id(int id);
 
 void add_frequently_changed_parameters(wxWindow* parent, wxBoxSizer* sizer, wxFlexGridSizer* preset_sizer);
 
diff --git a/xs/src/slic3r/GUI/OptionsGroup.hpp b/xs/src/slic3r/GUI/OptionsGroup.hpp
index 42db22225..aa0563866 100644
--- a/xs/src/slic3r/GUI/OptionsGroup.hpp
+++ b/xs/src/slic3r/GUI/OptionsGroup.hpp
@@ -97,9 +97,9 @@ public:
 							if (m_fields.find(id) == m_fields.end()) return nullptr;
 							return m_fields.at(id).get();
     }
-	bool			set_value(t_config_option_key id, boost::any value) {
+	bool			set_value(t_config_option_key id, boost::any value, bool change_event = false) {
 							if (m_fields.find(id) == m_fields.end()) return false;
-							m_fields.at(id)->set_value(value);
+							m_fields.at(id)->set_value(value, change_event);
 							return true;
     }
 	boost::any		get_value(t_config_option_key id) {
diff --git a/xs/src/slic3r/GUI/Tab.cpp b/xs/src/slic3r/GUI/Tab.cpp
index e2dfa6f27..d0f9f0ce3 100644
--- a/xs/src/slic3r/GUI/Tab.cpp
+++ b/xs/src/slic3r/GUI/Tab.cpp
@@ -3,6 +3,9 @@
 #include "PresetBundle.hpp"
 #include "PresetHints.hpp"
 #include "../../libslic3r/Utils.hpp"
+#include "slic3r/Utils/Http.hpp"
+#include "slic3r/Utils/OctoPrint.hpp"
+#include "BonjourDialog.hpp"
 
 #include <wx/app.h>
 #include <wx/button.h>
@@ -14,6 +17,7 @@
 #include <wx/treectrl.h>
 #include <wx/imaglist.h>
 #include <wx/settings.h>
+#include <wx/filedlg.h>
 
 #include <boost/algorithm/string/predicate.hpp>
 
@@ -1102,39 +1106,18 @@ void TabPrinter::build()
 		}
 
 		optgroup = page->new_optgroup(_(L("OctoPrint upload")));
-		// # append two buttons to the Host line
-		auto octoprint_host_browse = [this] (wxWindow* parent) {
+
+		auto octoprint_host_browse = [this, optgroup] (wxWindow* parent) {
 			auto btn = new wxButton(parent, wxID_ANY, _(L(" Browse "))+"\u2026", wxDefaultPosition, wxDefaultSize, wxBU_LEFT);
-//			btn->SetFont($Slic3r::GUI::small_font);
 			btn->SetBitmap(wxBitmap(from_u8(Slic3r::var("zoom.png")), wxBITMAP_TYPE_PNG));
 			auto sizer = new wxBoxSizer(wxHORIZONTAL);
 			sizer->Add(btn);
 
-			if (m_is_disabled_button_browse) 
-				btn->Disable();
-
-			btn->Bind(wxEVT_BUTTON, [this, parent](wxCommandEvent e){
-				if (m_event_button_browse > 0){
-					wxCommandEvent event(m_event_button_browse);
-					event.SetString("Button BROWSE was clicked!");
-					g_wxMainFrame->ProcessWindowEvent(event);
+			btn->Bind(wxEVT_BUTTON, [this, parent, optgroup](wxCommandEvent e) {
+				BonjourDialog dialog(parent);
+				if (dialog.show_and_lookup()) {
+					optgroup->set_value("octoprint_host", std::move(dialog.get_selected()), true);
 				}
-// 				// # look for devices
-// 				auto entries;
-// 				{
-// 					my $res = Net::Bonjour->new('http');
-// 					$res->discover;
-// 					$entries = [$res->entries];
-// 				}
-// 				if (@{$entries}) {
-// 					my $dlg = Slic3r::GUI::BonjourBrowser->new($self, $entries);
-// 					$self->_load_key_value('octoprint_host', $dlg->GetValue . ":".$dlg->GetPort)
-// 						if $dlg->ShowModal == wxID_OK;
-// 				}
-// 				else {
-// 					auto msg_window = new wxMessageDialog(parent, "No Bonjour device found", "Device Browser", wxOK | wxICON_INFORMATION);
-// 					msg_window->ShowModal();
-// 				}
 			});
 
 			return sizer;
@@ -1143,33 +1126,23 @@ void TabPrinter::build()
 		auto octoprint_host_test = [this](wxWindow* parent) {
 			auto btn = m_octoprint_host_test_btn = new wxButton(parent, wxID_ANY, _(L("Test")), 
 				wxDefaultPosition, wxDefaultSize, wxBU_LEFT | wxBU_EXACTFIT);
-//			btn->SetFont($Slic3r::GUI::small_font);
 			btn->SetBitmap(wxBitmap(from_u8(Slic3r::var("wrench.png")), wxBITMAP_TYPE_PNG));
 			auto sizer = new wxBoxSizer(wxHORIZONTAL);
 			sizer->Add(btn);
 
-			btn->Bind(wxEVT_BUTTON, [this, parent](wxCommandEvent e) {
-				if (m_event_button_test > 0){
-					wxCommandEvent event(m_event_button_test);
-					event.SetString("Button TEST was clicked!");
-					g_wxMainFrame->ProcessWindowEvent(event);
+			btn->Bind(wxEVT_BUTTON, [this](wxCommandEvent e) {
+				OctoPrint octoprint(m_config);
+				wxString msg;
+				if (octoprint.test(msg)) {
+					show_info(this, _(L("Connection to OctoPrint works correctly.")), _(L("Success!")));
+				} else {
+					const auto text = wxString::Format("%s: %s\n\n%s",
+						_(L("Could not connect to OctoPrint")), msg, _(L("Note: OctoPrint version at least 1.1.0 is required."))
+					);
+					show_error(this, text);
 				}
-// 				my $ua = LWP::UserAgent->new;
-// 				$ua->timeout(10);
-// 
-// 				my $res = $ua->get(
-// 					"http://".$self->{config}->octoprint_host . "/api/version",
-// 					'X-Api-Key' = > $self->{config}->octoprint_apikey,
-// 					);
-// 				if ($res->is_success) {
-// 					show_info(parent, "Connection to OctoPrint works correctly.", "Success!");
-// 				}
-// 				else {
-// 					show_error(parent, 
-// 						"I wasn't able to connect to OctoPrint (".$res->status_line . "). "
-// 						. "Check hostname and OctoPrint version (at least 1.1.0 is required).");
-// 				}
- 			});
+			});
+
 			return sizer;
 		};
 
@@ -1179,6 +1152,45 @@ void TabPrinter::build()
 		optgroup->append_line(host_line);
 		optgroup->append_single_option_line("octoprint_apikey");
 
+		if (Http::ca_file_supported()) {
+
+			Line cafile_line = optgroup->create_single_option_line("octoprint_cafile");
+
+			auto octoprint_cafile_browse = [this, optgroup] (wxWindow* parent) {
+				auto btn = new wxButton(parent, wxID_ANY, _(L(" Browse "))+"\u2026", wxDefaultPosition, wxDefaultSize, wxBU_LEFT);
+				btn->SetBitmap(wxBitmap(from_u8(Slic3r::var("zoom.png")), wxBITMAP_TYPE_PNG));
+				auto sizer = new wxBoxSizer(wxHORIZONTAL);
+				sizer->Add(btn);
+
+				btn->Bind(wxEVT_BUTTON, [this, optgroup] (wxCommandEvent e){
+					static const auto filemasks = _(L("Certificate files (*.crt, *.pem)|*.crt;*.pem|All files|*.*"));
+					wxFileDialog openFileDialog(this, _(L("Open CA certificate file")), "", "", filemasks, wxFD_OPEN | wxFD_FILE_MUST_EXIST);
+					if (openFileDialog.ShowModal() != wxID_CANCEL) {
+						optgroup->set_value("octoprint_cafile", std::move(openFileDialog.GetPath()), true);
+					}
+				});
+
+				return sizer;
+			};
+
+			cafile_line.append_widget(octoprint_cafile_browse);
+			optgroup->append_line(cafile_line);
+
+			auto octoprint_cafile_hint = [this, optgroup] (wxWindow* parent) {
+				auto txt = new wxStaticText(parent, wxID_ANY, 
+					_(L("HTTPS CA file is optional. It is only needed if you use HTTPS with a self-signed certificate.")));
+				auto sizer = new wxBoxSizer(wxHORIZONTAL);
+				sizer->Add(txt);
+				return sizer;
+			};
+
+			Line cafile_hint { "", "" };
+			cafile_hint.full_width = 1;
+			cafile_hint.widget = std::move(octoprint_cafile_hint);
+			optgroup->append_line(cafile_hint);
+
+		}
+
 		optgroup = page->new_optgroup(_(L("Firmware")));
 		optgroup->append_single_option_line("gcode_flavor");
 
@@ -1337,13 +1349,8 @@ void TabPrinter::update(){
 			m_serial_test_btn->Disable();
 	}
 
-	en = !m_config->opt_string("octoprint_host").empty();
-	if ( en && m_is_user_agent)
-		m_octoprint_host_test_btn->Enable();
-	else 
-		m_octoprint_host_test_btn->Disable(); 
-	get_field("octoprint_apikey")->toggle(en);
-
+	m_octoprint_host_test_btn->Enable(!m_config->opt_string("octoprint_host").empty());
+	
 	bool have_multiple_extruders = m_extruders_count > 1;
 	get_field("toolchange_gcode")->toggle(have_multiple_extruders);
 	get_field("single_extruder_multi_material")->toggle(have_multiple_extruders);
diff --git a/xs/src/slic3r/GUI/Tab.hpp b/xs/src/slic3r/GUI/Tab.hpp
index e2dc51ee4..4f65f1475 100644
--- a/xs/src/slic3r/GUI/Tab.hpp
+++ b/xs/src/slic3r/GUI/Tab.hpp
@@ -214,11 +214,6 @@ public:
 //Slic3r::GUI::Tab::Printer;
 class TabPrinter : public Tab
 {
-	bool		m_is_disabled_button_browse;
-	bool		m_is_user_agent;
-	// similar event by clicking Buttons "Browse" & "Test"
-	wxEventType	m_event_button_browse = 0;
-	wxEventType m_event_button_test = 0;
 public:
 	wxButton*	m_serial_test_btn;
 	wxButton*	m_octoprint_host_test_btn;
@@ -228,10 +223,7 @@ public:
 	std::vector<PageShp>	m_extruder_pages;
 
 	TabPrinter() {}
-	TabPrinter(wxNotebook* parent, bool no_controller, bool is_disabled_btn_browse, bool is_user_agent) :
-		Tab(parent, _(L("Printer Settings")), "printer", no_controller),
-		m_is_disabled_button_browse(is_disabled_btn_browse), 
-		m_is_user_agent(is_user_agent) {}
+	TabPrinter(wxNotebook* parent, bool no_controller) : Tab(parent, _(L("Printer Settings")), "printer", no_controller) {}
 	~TabPrinter(){}
 
 	void		build() override;
@@ -240,10 +232,6 @@ public:
 	void		extruders_count_changed(size_t extruders_count);
 	void		build_extruder_pages();
 	void		on_preset_loaded() override;
-
-	// Set the events to the callbacks posted to the main frame window (currently implemented in Perl).
-	void		set_event_button_browse(wxEventType evt)	{ m_event_button_browse = evt; }
-	void		set_event_button_test(wxEventType evt)		{ m_event_button_test = evt; }
 };
 
 class SavePresetWindow :public wxDialog
diff --git a/xs/src/slic3r/Utils/Bonjour.cpp b/xs/src/slic3r/Utils/Bonjour.cpp
index 6107e2c60..09d9b5873 100644
--- a/xs/src/slic3r/Utils/Bonjour.cpp
+++ b/xs/src/slic3r/Utils/Bonjour.cpp
@@ -1,9 +1,7 @@
 #include "Bonjour.hpp"
 
-#include <iostream>  // XXX
 #include <cstdint>
 #include <algorithm>
-#include <unordered_map>
 #include <array>
 #include <vector>
 #include <string>
@@ -23,16 +21,18 @@ namespace asio = boost::asio;
 using boost::asio::ip::udp;
 
 
-// TODO: Fuzzing test (done without TXT)
-// FIXME: check char retype to unsigned
-
-
 namespace Slic3r {
 
 
 // Minimal implementation of a MDNS/DNS-SD client
 // This implementation is extremely simple, only the bits that are useful
-// for very basic MDNS discovery are present.
+// for basic MDNS discovery of OctoPi devices are present.
+// However, the bits that are present are implemented with security in mind.
+// Only fully correct DNS replies are allowed through.
+// While decoding the decoder will bail the moment it encounters anything fishy.
+// At least that's the idea. To help prove this is actually the case,
+// the implementations has been tested with AFL.
+
 
 struct DnsName: public std::string
 {
@@ -48,8 +48,7 @@ struct DnsName: public std::string
 			return boost::none;
 		}
 
-		// Check for recursion depth to prevent parsing names that are nested too deeply
-		// or end up cyclic:
+		// Check for recursion depth to prevent parsing names that are nested too deeply or end up cyclic:
 		if (depth >= MAX_RECURSION) {
 			return boost::none;
 		}
@@ -443,6 +442,30 @@ private:
 	}
 };
 
+std::ostream& operator<<(std::ostream &os, const DnsMessage &msg)
+{
+	os << "DnsMessage(ID: " << msg.header.id << ", "
+		<< "Q: " << (msg.question ? msg.question->name.c_str() : "none") << ", "
+		<< "A: " << (msg.rr_a ? msg.rr_a->ip.to_string() : "none") << ", "
+		<< "AAAA: " << (msg.rr_aaaa ? msg.rr_aaaa->ip.to_string() : "none") << ", "
+		<< "services: [";
+
+		enum { SRV_PRINT_MAX = 3 };
+		unsigned i = 0;
+		for (const auto &sdpair : msg.sdmap) {
+			os << sdpair.first << ", ";
+
+			if (++i >= SRV_PRINT_MAX) {
+				os << "...";
+				break;
+			}
+		}
+
+		os << "])";
+
+	return os;
+}
+
 
 struct BonjourRequest
 {
@@ -515,6 +538,7 @@ struct Bonjour::priv
 	const std::string protocol;
 	const std::string service_dn;
 	unsigned timeout;
+	unsigned retries;
 	uint16_t rq_id;
 
 	std::vector<char> buffer;
@@ -524,6 +548,7 @@ struct Bonjour::priv
 
 	priv(std::string service, std::string protocol);
 
+	std::string strip_service_dn(const std::string &service_name) const;
 	void udp_receive(udp::endpoint from, size_t bytes);
 	void lookup_perform();
 };
@@ -533,11 +558,26 @@ Bonjour::priv::priv(std::string service, std::string protocol) :
 	protocol(std::move(protocol)),
 	service_dn((boost::format("_%1%._%2%.local") % this->service % this->protocol).str()),
 	timeout(10),
+	retries(1),
 	rq_id(0)
 {
 	buffer.resize(DnsMessage::MAX_SIZE);
 }
 
+std::string Bonjour::priv::strip_service_dn(const std::string &service_name) const
+{
+	if (service_name.size() <= service_dn.size()) {
+		return service_name;
+	}
+
+	auto needle = service_name.rfind(service_dn);
+	if (needle == service_name.size() - service_dn.size()) {
+		return service_name.substr(0, needle - 1);
+	} else {
+		return service_name;
+	}
+}
+
 void Bonjour::priv::udp_receive(udp::endpoint from, size_t bytes)
 {
 	if (bytes == 0 || !replyfn) {
@@ -557,7 +597,10 @@ void Bonjour::priv::udp_receive(udp::endpoint from, size_t bytes)
 			}
 
 			const auto &srv = *sdpair.second.srv;
-			BonjourReply reply(ip, sdpair.first, srv.hostname);
+			auto service_name = strip_service_dn(sdpair.first);
+
+			std::string path;
+			std::string version;
 
 			if (sdpair.second.txt) {
 				static const std::string tag_path = "path=";
@@ -565,13 +608,14 @@ void Bonjour::priv::udp_receive(udp::endpoint from, size_t bytes)
 
 				for (const auto &value : sdpair.second.txt->values) {
 					if (value.size() > tag_path.size() && value.compare(0, tag_path.size(), tag_path) == 0) {
-						reply.path = value.substr(tag_path.size());
+						path = std::move(value.substr(tag_path.size()));
 					} else if (value.size() > tag_version.size() && value.compare(0, tag_version.size(), tag_version) == 0) {
-						reply.version = value.substr(tag_version.size());
+						version = std::move(value.substr(tag_version.size()));
 					}
 				}
 			}
 
+			BonjourReply reply(ip, srv.port, std::move(service_name), srv.hostname, std::move(path), std::move(version));
 			replyfn(std::move(reply));
 		}
 	}
@@ -595,15 +639,26 @@ void Bonjour::priv::lookup_perform()
 		udp::endpoint mcast(BonjourRequest::MCAST_IP4, BonjourRequest::MCAST_PORT);
 		socket.send_to(asio::buffer(brq->data), mcast);
 
-		bool timeout = false;
+		bool expired = false;
+		bool retry = false;
 		asio::deadline_timer timer(io_service);
-		timer.expires_from_now(boost::posix_time::seconds(10));
-		timer.async_wait([=, &timeout](const error_code &error) {
-			timeout = true;
-			if (self->completefn) {
-				self->completefn();
+		retries--;
+		std::function<void(const error_code &)> timer_handler = [&](const error_code &error) {
+			if (retries == 0 || error) {
+				expired = true;
+				if (self->completefn) {
+					self->completefn();
+				}
+			} else {
+				retry = true;
+				retries--;
+				timer.expires_from_now(boost::posix_time::seconds(timeout));
+				timer.async_wait(timer_handler);
 			}
-		});
+		};
+
+		timer.expires_from_now(boost::posix_time::seconds(timeout));
+		timer.async_wait(timer_handler);
 
 		udp::endpoint recv_from;
 		const auto recv_handler = [&](const error_code &error, size_t bytes) {
@@ -612,8 +667,11 @@ void Bonjour::priv::lookup_perform()
 		socket.async_receive_from(asio::buffer(buffer, buffer.size()), recv_from, recv_handler);
 
 		while (io_service.run_one()) {
-			if (timeout) {
+			if (expired) {
 				socket.cancel();
+			} else if (retry) {
+				retry = false;
+				socket.send_to(asio::buffer(brq->data), mcast);
 			} else {
 				buffer.resize(DnsMessage::MAX_SIZE);
 				socket.async_receive_from(asio::buffer(buffer, buffer.size()), recv_from, recv_handler);
@@ -626,13 +684,39 @@ void Bonjour::priv::lookup_perform()
 
 // API - public part
 
-BonjourReply::BonjourReply(boost::asio::ip::address ip, std::string service_name, std::string hostname) :
+BonjourReply::BonjourReply(boost::asio::ip::address ip, uint16_t port, std::string service_name, std::string hostname, std::string path, std::string version) :
 	ip(std::move(ip)),
+	port(port),
 	service_name(std::move(service_name)),
 	hostname(std::move(hostname)),
-	path("/"),
-	version("Unknown")
-{}
+	path(path.empty() ? std::move(std::string("/")) : std::move(path)),
+	version(version.empty() ? std::move(std::string("Unknown")) : std::move(version))
+{
+	std::string proto;
+	std::string port_suffix;
+	if (port == 443) { proto = "https://"; }
+	if (port != 443 && port != 80) { port_suffix = std::to_string(port).insert(0, 1, ':'); }
+	if (this->path[0] != '/') { this->path.insert(0, 1, '/'); }
+	full_address = proto + ip.to_string() + port_suffix;
+	if (this->path != "/") { full_address += path; }
+}
+
+bool BonjourReply::operator==(const BonjourReply &other) const
+{
+	return this->full_address == other.full_address
+		&& this->service_name == other.service_name;
+}
+
+bool BonjourReply::operator<(const BonjourReply &other) const
+{
+	if (this->ip != other.ip) {
+		// So that the common case doesn't involve string comparison
+		return this->ip < other.ip;
+	} else {
+		auto cmp = this->full_address.compare(other.full_address);
+		return cmp != 0 ? cmp < 0 : this->service_name < other.service_name;
+	}
+}
 
 std::ostream& operator<<(std::ostream &os, const BonjourReply &reply)
 {
@@ -641,6 +725,7 @@ std::ostream& operator<<(std::ostream &os, const BonjourReply &reply)
 	return os;
 }
 
+
 Bonjour::Bonjour(std::string service, std::string protocol) :
 	p(new priv(std::move(service), std::move(protocol)))
 {}
@@ -660,6 +745,12 @@ Bonjour& Bonjour::set_timeout(unsigned timeout)
 	return *this;
 }
 
+Bonjour& Bonjour::set_retries(unsigned retries)
+{
+	if (p && retries > 0) { p->retries = retries; }
+	return *this;
+}
+
 Bonjour& Bonjour::on_reply(ReplyFn fn)
 {
 	if (p) { p->replyfn = std::move(fn); }
@@ -677,7 +768,7 @@ Bonjour::Ptr Bonjour::lookup()
 	auto self = std::make_shared<Bonjour>(std::move(*this));
 
 	if (self->p) {
-		auto io_thread = std::thread([self](){
+		auto io_thread = std::thread([self]() {
 				self->p->lookup_perform();
 			});
 		self->p->io_thread = std::move(io_thread);
@@ -687,18 +778,4 @@ Bonjour::Ptr Bonjour::lookup()
 }
 
 
-void Bonjour::pokus()   // XXX
-{
-	auto bonjour = Bonjour("octoprint")
-		.set_timeout(15)
-		.on_reply([](BonjourReply &&reply) {
-			std::cerr << "BonjourReply: " << reply << std::endl;
-		})
-		.on_complete([](){
-			std::cerr << "MDNS lookup complete" << std::endl;
-		})
-		.lookup();
-}
-
-
 }
diff --git a/xs/src/slic3r/Utils/Bonjour.hpp b/xs/src/slic3r/Utils/Bonjour.hpp
index 285625c04..63f34638c 100644
--- a/xs/src/slic3r/Utils/Bonjour.hpp
+++ b/xs/src/slic3r/Utils/Bonjour.hpp
@@ -1,26 +1,31 @@
 #ifndef slic3r_Bonjour_hpp_
 #define slic3r_Bonjour_hpp_
 
+#include <cstdint>
 #include <memory>
 #include <string>
 #include <functional>
-// #include <ostream>
 #include <boost/asio/ip/address.hpp>
 
 
 namespace Slic3r {
 
 
-// TODO: reply data structure
 struct BonjourReply
 {
 	boost::asio::ip::address ip;
+	uint16_t port;
 	std::string service_name;
 	std::string hostname;
+	std::string full_address;
 	std::string path;
 	std::string version;
 
-	BonjourReply(boost::asio::ip::address ip, std::string service_name, std::string hostname);
+	BonjourReply() = delete;
+	BonjourReply(boost::asio::ip::address ip, uint16_t port, std::string service_name, std::string hostname, std::string path, std::string version);
+
+	bool operator==(const BonjourReply &other) const;
+	bool operator<(const BonjourReply &other) const;
 };
 
 std::ostream& operator<<(std::ostream &, const BonjourReply &);
@@ -32,7 +37,7 @@ private:
 	struct priv;
 public:
 	typedef std::shared_ptr<Bonjour> Ptr;
-	typedef std::function<void(BonjourReply &&reply)> ReplyFn;
+	typedef std::function<void(BonjourReply &&)> ReplyFn;
 	typedef std::function<void()> CompleteFn;
 
 	Bonjour(std::string service, std::string protocol = "tcp");
@@ -40,12 +45,15 @@ public:
 	~Bonjour();
 
 	Bonjour& set_timeout(unsigned timeout);
+	Bonjour& set_retries(unsigned retries);
+	// ^ Note: By default there is 1 retry (meaning 1 broadcast is sent).
+	// Timeout is per one retry, ie. total time spent listening = retries * timeout.
+	// If retries > 1, then care needs to be taken as more than one reply from the same service may be received.
+
 	Bonjour& on_reply(ReplyFn fn);
 	Bonjour& on_complete(CompleteFn fn);
 
 	Ptr lookup();
-
-	static void pokus();    // XXX: remove
 private:
 	std::unique_ptr<priv> p;
 };
diff --git a/xs/src/slic3r/Utils/Http.cpp b/xs/src/slic3r/Utils/Http.cpp
index 45a350a59..de28904e2 100644
--- a/xs/src/slic3r/Utils/Http.cpp
+++ b/xs/src/slic3r/Utils/Http.cpp
@@ -3,7 +3,6 @@
 #include <cstdlib>
 #include <functional>
 #include <thread>
-#include <iostream>
 #include <tuple>
 #include <boost/format.hpp>
 
@@ -45,7 +44,9 @@ struct Http::priv
 	priv(const std::string &url);
 	~priv();
 
+	static bool ca_file_supported(::CURL *curl);
 	static size_t writecb(void *data, size_t size, size_t nmemb, void *userp);
+	std::string curl_error(CURLcode curlcode);
 	std::string body_size_error();
 	void http_perform();
 };
@@ -71,6 +72,29 @@ Http::priv::~priv()
 	::curl_slist_free_all(headerlist);
 }
 
+bool Http::priv::ca_file_supported(::CURL *curl)
+{
+#ifdef _WIN32
+	bool res = false;
+#else
+	bool res = true;
+#endif
+
+	if (curl == nullptr) { return res; }
+
+#if LIBCURL_VERSION_MAJOR >= 7 && LIBCURL_VERSION_MINOR >= 48
+	::curl_tlssessioninfo *tls;
+	if (::curl_easy_getinfo(curl, CURLINFO_TLS_SSL_PTR, &tls) == CURLE_OK) {
+		if (tls->backend == CURLSSLBACKEND_SCHANNEL || tls->backend == CURLSSLBACKEND_DARWINSSL) {
+			// With Windows and OS X native SSL support, cert files cannot be set
+			res = false;
+		}
+	}
+#endif
+
+	return res;
+}
+
 size_t Http::priv::writecb(void *data, size_t size, size_t nmemb, void *userp)
 {
 	auto self = static_cast<priv*>(userp);
@@ -88,6 +112,14 @@ size_t Http::priv::writecb(void *data, size_t size, size_t nmemb, void *userp)
 	return realsize;
 }
 
+std::string Http::priv::curl_error(CURLcode curlcode)
+{
+	return (boost::format("%1% (%2%)")
+		% ::curl_easy_strerror(curlcode)
+		% curlcode
+	).str();
+}
+
 std::string Http::priv::body_size_error()
 {
 	return (boost::format("HTTP body data size exceeded limit (%1% bytes)") % limit).str();
@@ -121,7 +153,7 @@ void Http::priv::http_perform()
 		if (res == CURLE_WRITE_ERROR) {
 			error = std::move(body_size_error());
 		} else {
-			error = ::curl_easy_strerror(res);
+			error = std::move(curl_error(res));
 		};
 
 		if (errorfn) {
@@ -180,7 +212,7 @@ Http& Http::remove_header(std::string name)
 
 Http& Http::ca_file(const std::string &name)
 {
-	if (p) {
+	if (p && priv::ca_file_supported(p->curl)) {
 		::curl_easy_setopt(p->curl, CURLOPT_CAINFO, name.c_str());
 	}
 
@@ -257,5 +289,13 @@ Http Http::post(std::string url)
 	return http;
 }
 
+bool Http::ca_file_supported()
+{
+	::CURL *curl = ::curl_easy_init();
+	bool res = priv::ca_file_supported(curl);
+	if (curl != nullptr) { ::curl_easy_cleanup(curl); }
+	return res;
+}
+
 
 }
diff --git a/xs/src/slic3r/Utils/Http.hpp b/xs/src/slic3r/Utils/Http.hpp
index c591e17c5..6ac5fcce1 100644
--- a/xs/src/slic3r/Utils/Http.hpp
+++ b/xs/src/slic3r/Utils/Http.hpp
@@ -41,6 +41,7 @@ public:
 	Ptr perform();
 	void perform_sync();
 
+	static bool ca_file_supported();
 private:
 	Http(const std::string &url);
 
diff --git a/xs/src/slic3r/Utils/OctoPrint.cpp b/xs/src/slic3r/Utils/OctoPrint.cpp
index 58530833b..5bf51f470 100644
--- a/xs/src/slic3r/Utils/OctoPrint.cpp
+++ b/xs/src/slic3r/Utils/OctoPrint.cpp
@@ -20,16 +20,19 @@ OctoPrint::OctoPrint(DynamicPrintConfig *config) :
 	cafile(config->opt_string("octoprint_cafile"))
 {}
 
-std::string  OctoPrint::test() const
+bool OctoPrint::test(wxString &msg) const
 {
 	// Since the request is performed synchronously here,
-	// it is ok to refer to `res` from within the closure
-	std::string res;
+	// it is ok to refer to `msg` from within the closure
 
-	auto http = Http::get(std::move(make_url("api/version")));
+	bool res = true;
+
+	auto url = std::move(make_url("api/version"));
+	auto http = Http::get(std::move(url));
 	set_auth(http);
 	http.on_error([&](std::string, std::string error, unsigned status) {
-			res = format_error(error, status);
+			res = false;
+			msg = format_error(error, status);
 		})
 		.perform_sync();
 
@@ -43,21 +46,26 @@ void OctoPrint::send_gcode(int windowId, int completeEvt, int errorEvt, const st
 	http.form_add("print", print ? "true" : "false")
 		.form_add_file("file", filename)
 		.on_complete([=](std::string body, unsigned status) {
-			wxWindow *window = GUI::get_widget_by_id(windowId);
+			wxWindow *window = wxWindow::FindWindowById(windowId);
+			if (window == nullptr) { return; }
+
 			wxCommandEvent* evt = new wxCommandEvent(completeEvt);
-			evt->SetString("G-code file successfully uploaded to the OctoPrint server");
+			evt->SetString(_(L("G-code file successfully uploaded to the OctoPrint server")));
 			evt->SetInt(100);
 			wxQueueEvent(window, evt);
 		})
 		.on_error([=](std::string body, std::string error, unsigned status) {
-			wxWindow *window = GUI::get_widget_by_id(windowId);
+			wxWindow *window = wxWindow::FindWindowById(windowId);
+			if (window == nullptr) { return; }
 
 			wxCommandEvent* evt_complete = new wxCommandEvent(completeEvt);
 			evt_complete->SetInt(100);
 			wxQueueEvent(window, evt_complete);
 
 			wxCommandEvent* evt_error = new wxCommandEvent(errorEvt);
-			evt_error->SetString(wxString::Format("Error while uploading to the OctoPrint server: %s", format_error(error, status)));
+			evt_error->SetString(wxString::Format("%s: %s",
+				_(L("Error while uploading to the OctoPrint server")),
+				format_error(error, status)));
 			wxQueueEvent(window, evt_error);
 		})
 		.perform();
@@ -85,19 +93,15 @@ std::string OctoPrint::make_url(const std::string &path) const
 	}
 }
 
-std::string OctoPrint::format_error(std::string error, unsigned status)
+wxString OctoPrint::format_error(std::string error, unsigned status)
 {
-	if (status != 0) {
-		std::string res{"HTTP "};
-		res.append(std::to_string(status));
+	const wxString wxerror = error;
 
-		if (status == 401) {
-			res.append(": Invalid API key");
-		}
-
-		return std::move(res);
+	if (status != 0) {
+		return wxString::Format("HTTP %u: %s", status,
+			(status == 401 ? _(L("Invalid API key")) : wxerror));
 	} else {
-		return std::move(error);
+		return std::move(wxerror);
 	}
 }
 
diff --git a/xs/src/slic3r/Utils/OctoPrint.hpp b/xs/src/slic3r/Utils/OctoPrint.hpp
index eca3baa63..1f544295c 100644
--- a/xs/src/slic3r/Utils/OctoPrint.hpp
+++ b/xs/src/slic3r/Utils/OctoPrint.hpp
@@ -2,8 +2,8 @@
 #define slic3r_OctoPrint_hpp_
 
 #include <string>
+#include <wx/string.h>
 
-// #include "Http.hpp"    // XXX: ?
 
 namespace Slic3r {
 
@@ -16,8 +16,7 @@ class OctoPrint
 public:
 	OctoPrint(DynamicPrintConfig *config);
 
-	std::string test() const;
-	// XXX: style
+	bool test(wxString &curl_msg) const;
 	void send_gcode(int windowId, int completeEvt, int errorEvt, const std::string &filename, bool print = false) const;
 private:
 	std::string host;
@@ -26,7 +25,7 @@ private:
 
 	void set_auth(Http &http) const;
 	std::string make_url(const std::string &path) const;
-	static std::string format_error(std::string error, unsigned status);
+	static wxString format_error(std::string error, unsigned status);
 };