reject query, reply and "from storage" requests

Author: DedeHai

wled00/e131.cpp

@@ -33,6 +33,12 @@ static void handleDDPPacket(e131_packet_t* p, size_t packetLen) {
   // reject control, status and config packets (not implemented)
   if (p->destination == DDP_ID_CONTROL || p->destination == DDP_ID_STATUS || p->destination == DDP_ID_CONFIG) return;
 
+  // reject query and response packets (not implemented)
+  if (p->flags & (DDP_FLAGS_QUERY | DDP_FLAGS_REPLY)) return;
+
+  bool push = p->flags & DDP_FLAGS_PUSH; // push flag means "render now"
+  if (!push && (p->flags & DDP_FLAGS_STORAGE)) return; // reject "from storage" flag but still let the push flag pass if set along with it
+
   //reject late packets belonging to previous frame (assuming 4 packets max. before push, if more are used and packets are very late, they are still accepted)
   if (e131SkipOutOfSequence && lastPushSeq) {
     int sn = p->sequenceNum & 0xF; // sequence number is 4 bits, 1-15, 0 means unused
@@ -78,7 +84,6 @@ static void handleDDPPacket(e131_packet_t* p, size_t packetLen) {
     }
   }
 
-  bool push = p->flags & DDP_FLAGS_PUSH;
   ddpSeenPush |= push;
   if (!ddpSeenPush || push) { // if we've never seen a push, or this is one, render display
     e131NewData = true;

wled00/src/dependencies/e131/ESPAsyncE131.h

@@ -55,9 +55,9 @@ typedef struct ip_addr ip4_addr_t;
 #define DDP_FLAGS_VER     0xc0    // version mask
 #define DDP_FLAGS_VER1    0x40    // version=1
 #define DDP_FLAGS_PUSH    0x01
-#define DDP_FLAGS_QUERY   0x02
-#define DDP_FLAGS_REPLY   0x04
-#define DDP_FLAGS_STORAGE 0x08
+#define DDP_FLAGS_QUERY   0x02    // unsupported - used by XLights for auto-discovery
+#define DDP_FLAGS_REPLY   0x04    // unsupported - response packet from another display
+#define DDP_FLAGS_STORAGE 0x08    // unsupported - show data from a storage unit instead of from packet data field. Data field defines storage unit (by name, number, URL or whatever mechanism wanted).
 #define DDP_FLAGS_TIME    0x10
 
 #define DDP_CHANNELS_PER_PACKET 1440 // 480 leds