Added JSON API over serial support (#2156)

* Added JSON API over serial support

* Disable Serial API if pin 3 is used

Disable serial response if pin 1 is used

CHANGELOG.md

@@ -2,6 +2,12 @@
 
 ### Builds after release 0.12.0
 
+#### Build 2108250
+
+-   Added Sync groups (PR #2150)
+-   Added JSON API over Serial support
+-   Live color correction (PR #1902)
+
 #### Build 2108180
 
 -   Fixed JSON IR remote not working with codes greater than 0xFFFFFF (fixes #2135)

wled00/wled.h

@@ -8,7 +8,7 @@
  */
 
 // version code in format yymmddb (b = daily build)
-#define VERSION 2108180
+#define VERSION 2108250
 
 //uncomment this if you have a "my_config.h" file you'd like to use
 //#define WLED_USE_MY_CONFIG

wled00/wled_serial.cpp

@@ -21,6 +21,8 @@ enum class AdaState {
 
 void handleSerial()
 {
+  if (pinManager.isPinAllocated(3)) return;
+  
   #ifdef WLED_ENABLE_ADALIGHT
   static auto state = AdaState::Header_A;
   static uint16_t count = 0;
@@ -32,13 +34,35 @@ void handleSerial()
   while (Serial.available() > 0)
   {
     yield();
-    byte next = Serial.read();
+    byte next = Serial.peek();
     switch (state) {
       case AdaState::Header_A:
         if (next == 'A') state = AdaState::Header_d;
         else if (next == 0xC9) { //TPM2 start byte
           state = AdaState::TPM2_Header_Type;
         }
+        else if (next == '{') { //JSON API
+          bool verboseResponse = false;
+          {
+            DynamicJsonDocument doc(JSON_BUFFER_SIZE);
+            Serial.setTimeout(100);
+            DeserializationError error = deserializeJson(doc, Serial);
+            if (error) return;
+            fileDoc = &doc;
+            verboseResponse = deserializeState(doc.as<JsonObject>());
+            fileDoc = nullptr;
+          }
+          //only send response if TX pin is unused for other purposes
+          if (verboseResponse && !pinManager.isPinAllocated(1)) {
+            DynamicJsonDocument doc(JSON_BUFFER_SIZE);
+            JsonObject state = doc.createNestedObject("state");
+            serializeState(state);
+            JsonObject info  = doc.createNestedObject("info");
+            serializeInfo(info);
+
+            serializeJson(doc, Serial);
+          }
+        }
         break;
       case AdaState::Header_d:
         if (next == 'd') state = AdaState::Header_a;
@@ -98,6 +122,7 @@ void handleSerial()
         }
         break;
     }
+    Serial.read(); //discard the byte
   }
   #endif
 }