Add UDP test code

Courtesy of @_tvk_ on Discord

tools/udp_test.py

@@ -0,0 +1,46 @@
+import numpy as np
+import socket
+
+class WledRealtimeClient:
+    def __init__(self, wled_controller_ip, num_pixels, udp_port=21324, max_pixels_per_packet=126):
+        self.wled_controller_ip = wled_controller_ip
+        self.num_pixels = num_pixels
+        self.udp_port = udp_port
+        self.max_pixels_per_packet = max_pixels_per_packet
+        self._sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
+        self._prev_pixels = np.full((3, self.num_pixels), 253, dtype=np.uint8)
+        self.pixels = np.full((3, self.num_pixels), 1, dtype=np.uint8)
+    
+    def update(self):
+        # Truncate values and cast to integer
+        self.pixels = np.clip(self.pixels, 0, 255).astype(np.uint8)
+        p = np.copy(self.pixels)
+        
+        idx = np.where(~np.all(p == self._prev_pixels, axis=0))[0]
+        num_pixels = len(idx)
+        n_packets = (num_pixels + self.max_pixels_per_packet - 1) // self.max_pixels_per_packet
+        idx_split = np.array_split(idx, n_packets)
+        
+        header = bytes([1, 2])  # WARLS protocol header
+        for packet_indices in idx_split:
+            data = bytearray(header)
+            for i in packet_indices:
+                data.extend([i, *p[:, i]])  # Index and RGB values
+            self._sock.sendto(bytes(data), (self.wled_controller_ip, self.udp_port))
+        
+        self._prev_pixels = np.copy(p)
+
+
+
+################################## LED blink test ##################################
+if __name__ == "__main__":
+    WLED_CONTROLLER_IP = "192.168.1.153"
+    NUM_PIXELS = 255 # Amount of LEDs on your strip
+    import time
+    wled = WledRealtimeClient(WLED_CONTROLLER_IP, NUM_PIXELS)
+    print('Starting LED blink test')
+    while True:
+        for i in range(NUM_PIXELS):
+            wled.pixels[1, i] = 255 if wled.pixels[1, i] == 0 else 0
+        wled.update()
+        time.sleep(.01)