Usermod for Artemis udp control

enables use as a device within the artemisRGB software

usermods/Artemis_reciever/readme.md

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+Usermod to allow WLED to receive via UDP port from RGB.NET (and therefore add as a device to be controlled within artemis on PC)
+
+This is only a very simple code to support a single led strip, it does not support the full function of the RGB.NET sketch for esp8266 only what is needed to be used with Artemis. It will show as a ws281x device in artemis when you provide the correct hostname or ip. Artemis queries the number of LEDs via the web interface (/config) but communication to set the LEDs is all done via the UDP interface.
+
+To install, copy the usermod.cpp file to wled00 folder and recompile

usermods/Artemis_reciever/usermod.cpp

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+/*
+ *          RGB.NET (artemis) receiver
+ *          
+ * This works via the UDP, http is not supported apart from reporting LED count
+ * 
+ * 
+ */
+#include "wled.h"
+#include <WiFiUdp.h>
+
+WiFiUDP UDP;
+const unsigned int RGBNET_localUdpPort = 1872; // local port to listen on
+unsigned char RGBNET_packet[770];
+long lastTime = 0;
+int delayMs = 10;
+bool isRGBNETUDPEnabled;
+
+void RGBNET_readValues() {
+  
+  int RGBNET_packetSize = UDP.parsePacket();
+  if (RGBNET_packetSize) {
+    // receive incoming UDP packets
+    int sequenceNumber = UDP.read();
+    int channel = UDP.read();
+
+    //channel data is not used we only supports one channel
+    int len = UDP.read(RGBNET_packet, ledCount*3);
+    if(len==0){
+      return;
+    }
+    
+    for (int i = 0; i < len; i=i+3) {
+      strip.setPixelColor(i/3, RGBNET_packet[i], RGBNET_packet[i+1], RGBNET_packet[i+2], 0);
+    } 
+    //strip.show();  
+  }
+}
+
+//update LED strip
+void RGBNET_show() {
+  strip.show();
+  lastTime = millis();
+}
+
+//This function provides a json with info on the number of LEDs connected
+// it is needed by artemis to know how many LEDs to display on the surface
+void handleConfig(AsyncWebServerRequest *request)
+{
+  String config = (String)"{\
+  \"channels\": [\
+    {\
+      \"channel\": 1,\
+      \"leds\": " + ledCount + "\
+    },\
+    {\
+      \"channel\": 2,\
+      \"leds\": " + "0" + "\
+    },\
+    {\
+      \"channel\": 3,\
+      \"leds\": " + "0" + "\
+    },\
+    {\
+      \"channel\": 4,\
+      \"leds\": " + "0" + "\
+    }\
+  ]\
+}";
+  request->send(200, "application/json", config);
+}
+
+
+void userSetup()
+{
+  server.on("/config", HTTP_GET, [](AsyncWebServerRequest *request){ 
+    handleConfig(request);
+  });
+}
+
+void userConnected()
+{
+  // new wifi, who dis?
+  UDP.begin(RGBNET_localUdpPort);
+  isRGBNETUDPEnabled = true;
+}
+
+void userLoop()
+{
+  RGBNET_readValues();
+    if (millis()-lastTime > delayMs) {
+      RGBNET_show();
+    }
+}