feat(mpm): support RadioLink / DumboRC special commands (#7441)

radio/src/telemetry/multi.cpp

@@ -54,7 +54,8 @@ enum MultiPacketTypes : uint8_t
   HottTelemetry,
   MLinkTelemetry,
   ConfigTelemetry,
-  MultiProtoDef
+  MultiProtoDef,
+  RLinkTelemetry = 18,
 };
 
 enum MultiBufferState : uint8_t
@@ -308,6 +309,17 @@ static void processConfigPacket(const uint8_t * packet, uint8_t len)
     memcpy(&Multi_Buffer[13 + (packet[0] & 0x0F) * 20], &packet[1], 20); // Store the received page in the buffer
   }
 }
+
+static void processRLinkPacket(const uint8_t * packet, uint8_t len)
+{
+  // Multi_Buffer[0..3] == "RLnk" / Lua script is running
+  // Multi_Buffer[14]   == 0 RX buffer can be written / >0 Lua has not consumed it
+  // Multi_Buffer[15..] == payload from receiver
+  if (Multi_Buffer && memcmp(Multi_Buffer, "RLnk", 4) == 0 && Multi_Buffer[14] == 0 && len < 32) {
+    memcpy(&Multi_Buffer[15], packet, len);
+    Multi_Buffer[14] = len;
+  }
+}
 #endif
 
 #if defined(MULTI_PROTOLIST)
@@ -453,6 +465,10 @@ static void processMultiTelemetryPaket(const uint8_t * packet, uint8_t module)
       else
         TRACE("[MP] Received Config telemetry len %d < 20", len);
       break;
+
+    case RLinkTelemetry:
+      processRLinkPacket(data, len);
+      break;
 #endif
 
     case FrSkyHubTelemetry: