From 506a6cbfba878bd71b9293dc6def1595a4f77482 Mon Sep 17 00:00:00 2001
From: Alexey 'Cluster' Avdyukhin <clusterrr@clusterrr.com>
Date: Tue, 5 Jul 2022 22:07:59 +0400
Subject: Tuya virtual IR remote control device support.

---
 TuyaIRControl.cs | 152 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 152 insertions(+)
 create mode 100644 TuyaIRControl.cs

diff --git a/TuyaIRControl.cs b/TuyaIRControl.cs
new file mode 100644
index 0000000..2ca960c
--- /dev/null
+++ b/TuyaIRControl.cs
@@ -0,0 +1,152 @@
+using Newtonsoft.Json;
+using Newtonsoft.Json.Linq;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace com.clusterrr.TuyaNet
+{
+    /// <summary>
+    /// Tuya virtual IR remote control
+    /// </summary>
+    public class TuyaIRControl : TuyaDevice
+    {
+        /// <summary>
+        /// Creates a new instance of the TuyaDevice class.
+        /// </summary>
+        /// <param name="ip">IP address of device.</param>
+        /// <param name="localKey">Local key of device (obtained via API).</param>
+        /// <param name="deviceId">Device ID.</param>
+        /// <param name="protocolVersion">Protocol version.</param>
+        /// <param name="port">TCP port of device.</param>
+        /// <param name="receiveTimeout">Receive timeout  (msec).</param>
+        public TuyaIRControl(string ip, string localKey, string deviceId, TuyaProtocolVersion protocolVersion = TuyaProtocolVersion.V33, int port = 6668, int receiveTimeout = 250)
+            : base(ip, localKey, deviceId, protocolVersion, port, receiveTimeout)
+        {
+        }
+
+        /// <summary>
+        /// Learns button code of remote control.
+        /// </summary>
+        /// <param name="timeout">Learing timeout, you should press RC button during this interval.</param>
+        /// <param name="cancellationToken">Cancellation token.</param>
+        /// <returns>Button code as Base64 string.</returns>
+        public async Task<string> GetButtonCodeAsync(int timeout, CancellationToken cancellationToken = default)
+        {
+            try
+            {
+                var subCmd = new Dictionary<string, object>()
+                {
+                    { "control", "study_exit" }
+                };
+                var subCmdJson = JsonConvert.SerializeObject(subCmd);
+                await SetDpsAsync(new Dictionary<int, object>() { { 201, subCmdJson } }, nullRetries: 0, allowEmptyResponse: true, cancellationToken: cancellationToken);
+
+                await Task.Delay(1000);
+
+                subCmd = new Dictionary<string, object>()
+                {
+                    { "control", "study" }
+                };
+                subCmdJson = JsonConvert.SerializeObject(subCmd);
+                await SetDpsAsync(new Dictionary<int, object>() { { 201, subCmdJson } }, cancellationToken: cancellationToken);
+
+                while (true)
+                {
+                    var response = await SetDpsAsync(new Dictionary<int, object>() { { 201, subCmdJson } }, overrideRecvTimeout: timeout, allowEmptyResponse: true, cancellationToken: cancellationToken);
+                    if (response != null)
+                    {
+                        return response[202].ToString();
+                    }
+                }
+            } finally
+            {
+                try
+                {
+                    var subCmd = new Dictionary<string, object>()
+                    {
+                        { "control", "study_exit" }
+                    };
+                    var subCmdJson = JsonConvert.SerializeObject(subCmd);
+                    await SetDpsAsync(new Dictionary<int, object>() { { 201, subCmdJson } }, nullRetries: 0, allowEmptyResponse: true, cancellationToken: cancellationToken);
+                }
+                catch { }
+            }
+        }
+
+        /// <summary>
+        /// Sends button code.
+        /// </summary>
+        /// <param name="buttonCode">Button code in Base64 encoding.</param>
+        /// <param name="cancellationToken">Cancellation token.</param>
+        public async Task SendButtonCodeAsync(string buttonCode, CancellationToken cancellationToken = default)
+        {
+            var subCmd = new Dictionary<string, object>()
+            {
+                { "control", "send_ir" },
+                { "key1", buttonCode }
+            };
+            var subCmdJson = JsonConvert.SerializeObject(subCmd);
+            await SetDpsAsync(new Dictionary<int, object>() { { 201, subCmdJson } }, nullRetries: 0, allowEmptyResponse: true, cancellationToken: cancellationToken);
+        }
+
+        /// <summary>
+        /// Converts Base64 encoded button code into pulses duration.
+        /// </summary>
+        /// <param name="codeBase64">Base64 encoded button code.</param>
+        /// <returns>Pulses/gaps length in microsecods.</returns>
+        public static ushort[] Base64ToPulses(string codeBase64)
+        {
+            var bytes = Convert.FromBase64String(codeBase64);
+            var pulses = Enumerable.Range(2, bytes.Length - 3)
+                .Where(x => x % 2 == 0)
+                .Select(x => (ushort)((bytes[x] << 8 | bytes[x + 1]) / 4))
+                .ToArray();
+            return pulses;
+        }
+
+        /// <summary>
+        /// Converts pulses duration into Base64 encoded button code.
+        /// </summary>
+        /// <param name="pulses">Pulses/gaps length in microsecods.</param>
+        /// <returns>Base64 encoded button code.</returns>
+        public static string PulsesToBase64(ushort[] pulses)
+        {
+            var pulsesMult = pulses.Select(x => (ushort)(x * 4)); // Convert 1 us to 250ns
+            var code64 = Enumerable.Concat<UInt16>(new ushort[] { 0xd500 /* Uknown value*/ }, pulsesMult);
+            var code64b = code64.SelectMany(x => new byte[] { (byte)((x >> 8) & 0xFF), (byte)(x & 0xFF) });
+            code64b = Enumerable.Concat<byte>(code64b, new byte[] { 8 }); // Unknown padding byte
+            var codeBase64 = Convert.ToBase64String(code64b.ToArray());
+            return codeBase64;
+        }
+
+        /// <summary>
+        /// Converts hex encoded button code into pulses duration.
+        /// </summary>
+        /// <param name="codeHex">Hex encoded button code.</param>
+        /// <returns>Pulses/gaps length in microsecods.</returns>
+        public static ushort[] HexToPulses(string codeHex)
+        {
+            var pulses = Enumerable.Range(0, codeHex.Length)
+                .Where(x => (x % 4) == 0)
+                .Select(x => (ushort)(Convert.ToUInt16(codeHex.Substring(x + 2, 2) + codeHex.Substring(x, 2), 16)));
+            return pulses.ToArray();
+        }
+
+        /// <summary>
+        /// Converts pulses duration into hex encoded button code.
+        /// </summary>
+        /// <param name="pulses">Pulses/gaps length in microsecods.</param>
+        /// <returns>Hex encoded button code.</returns>
+        public static string PulsesToHex(ushort[] pulses)
+        {
+            var words = Enumerable.Range(0, pulses.Length)
+                .Select(x => $"{(pulses[x] & 0xFF):x02}{((pulses[x] >> 8) & 0xFF):x02}").ToArray();
+            var hex = string.Concat(words);
+            return hex;
+        }
+    }
+}
-- 
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