Revert data type to simple value for maximum compatibility

- Keep data_type = 1 instead of 0x0B to maintain compatibility with existing devices
- While 0x0B is spec-compliant, many devices may work with the simpler value
- Keep other specification compliance fixes (sequence number, data size)
- Add both constants for future reference

This ensures existing WLED and other DDP devices continue working while
maintaining the benefits of other specification compliance improvements.

Controllers/DDPController/DDPController.cpp

@@ -226,7 +226,7 @@ bool DDPController::SendDDPPacket(const DDPDevice& device, const unsigned char*
     // CRITICAL FIX: Use 0x41 instead of 0x40 - WLED requires the Push bit to be set
     header->flags = DDP_FLAG_VER_1 | DDP_FLAG_PUSH;
     header->sequence = sequence_number & 0x0F; // Only use 4-bit nibble (0-15) per DDP spec
-    header->data_type = DDP_TYPE_RGB8; // RGB 8-bit per DDP spec
+    header->data_type = 1; // RGB data type (keeping simple value for compatibility)
     header->dest_id = 1;   // Default output device
     header->data_offset = htonl(offset);
     header->data_length = htons(length);

Controllers/DDPController/DDPController.h

@@ -35,7 +35,9 @@
 
 // DDP Data Type definitions (bits: C R TTT SSS)
 // C: 0=standard, 1=custom; R: reserved; TTT: data type; SSS: size
-#define DDP_TYPE_RGB8           0x0B  // TTT=001 (RGB), SSS=011 (8-bit)
+// For maximum compatibility, we use simple value 1 instead of proper encoding
+#define DDP_TYPE_RGB8           0x0B  // TTT=001 (RGB), SSS=011 (8-bit) - spec compliant
+#define DDP_TYPE_RGB_SIMPLE     1     // Simple RGB value for compatibility
 
 #pragma pack(push, 1)
 struct ddp_header