From 9b98cbb8943a50767223b24195fee1de023d5520 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bla=C5=BE=20Kristan?= <blaz@kristan-sp.si>
Date: Sat, 11 Mar 2023 22:35:22 +0100
Subject: [PATCH] PROGMEM for header

---
 wled00/udp.cpp | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/wled00/udp.cpp b/wled00/udp.cpp
index b6370a596..6d7d28202 100644
--- a/wled00/udp.cpp
+++ b/wled00/udp.cpp
@@ -713,7 +713,9 @@ void sendSysInfoUDP()
 // buffer - a buffer of at least length*4 bytes long
 // isRGBW - true if the buffer contains 4 components per pixel
 
-uint8_t sequenceNumber = 0; // this needs to be shared across all outputs
+static       size_t sequenceNumber = 0; // this needs to be shared across all outputs
+static const size_t ART_NET_HEADER_SIZE = 12;
+static const byte   ART_NET_HEADER[] PROGMEM = {0x41,0x72,0x74,0x2d,0x4e,0x65,0x74,0x00,0x00,0x50,0x00,0x0e};
 
 uint8_t realtimeBroadcast(uint8_t type, IPAddress client, uint16_t length, uint8_t *buffer, uint8_t bri, bool isRGBW)  {
   if (!(apActive || interfacesInited) || !client[0] || !length) return 1;  // network not initialised or dummy/unset IP address  031522 ajn added check for ap
@@ -792,9 +794,9 @@ uint8_t realtimeBroadcast(uint8_t type, IPAddress client, uint16_t length, uint8
     case 2: //ArtNet
     {
       // calculate the number of UDP packets we need to send
-      size_t channelCount = length * (isRGBW?4:3); // 1 channel for every R,G,B,(W?) value
-      size_t ARTNET_CHANNELS_PER_PACKET = isRGBW?512:510; // 512/4=128 RGBW LEDs, 510/3=170 RGB LEDs
-      size_t packetCount = ((channelCount-1)/ARTNET_CHANNELS_PER_PACKET)+1;
+      const size_t channelCount = length * (isRGBW?4:3); // 1 channel for every R,G,B,(W?) value
+      const size_t ARTNET_CHANNELS_PER_PACKET = isRGBW?512:510; // 512/4=128 RGBW LEDs, 510/3=170 RGB LEDs
+      const size_t packetCount = ((channelCount-1)/ARTNET_CHANNELS_PER_PACKET)+1;
 
       uint32_t channel = 0; 
       size_t bufferOffset = 0;
@@ -819,9 +821,9 @@ uint8_t realtimeBroadcast(uint8_t type, IPAddress client, uint16_t length, uint8
           }
         }
 
-        const byte ART_NET_HEADER[12] = {0x41,0x72,0x74,0x2d,0x4e,0x65,0x74,0x00,0x00,0x50,0x00,0x0e};
-
-        ddpUdp.write(ART_NET_HEADER,12); // This doesn't change. Hard coded ID, OpCode, and protocol version.
+        byte buffer[ART_NET_HEADER_SIZE];
+        memcpy_P(buffer, ART_NET_HEADER, ART_NET_HEADER_SIZE);
+        ddpUdp.write(buffer, ART_NET_HEADER_SIZE); // This doesn't change. Hard coded ID, OpCode, and protocol version.
         ddpUdp.write(sequenceNumber & 0xFF); // sequence number. 1..255
         ddpUdp.write(0x00); // physical - more an FYI, not really used for anything. 0..3
         ddpUdp.write((currentPacket) & 0xFF); // Universe LSB. 1 full packet == 1 full universe, so just use current packet number.