Feature: Implementing UDP server and corresponding Python test file

README.md

@@ -188,6 +188,7 @@ App|Description
 [picow_ntp_client](pico_w/wifi/ntp_client) | Connects to an NTP server to fetch and display the current time.
 [picow_tcp_client](pico_w/wifi/tcp_client) | A simple TCP client. You can run [python_test_tcp_server.py](pico_w/wifi/python_test_tcp/python_test_tcp_server.py) for it to connect to.
 [picow_tcp_server](pico_w/wifi/tcp_server) | A simple TCP server. You can use [python_test_tcp_client.py](pico_w//wifi/python_test_tcp/python_test_tcp_client.py) to connect to it.
+[picow_udp_server](pico_w/wifi/udp_server) | A simple UDP server. You can use [python_test_udp_client.py](pico_w//wifi/python_test_udp/python_test_udp_client.py) to connect to it.
 [picow_tls_client](pico_w/wifi/tls_client) | Demonstrates how to make a HTTPS request using TLS.
 [picow_tls_verify](pico_w/wifi/tls_client) | Demonstrates how to make a HTTPS request using TLS with certificate verification.
 [picow_wifi_scan](pico_w/wifi/wifi_scan) | Scans for WiFi networks and prints the results.

pico_w/wifi/CMakeLists.txt

@@ -17,6 +17,7 @@ else()
     add_subdirectory_exclude_platforms(tcp_client)
     add_subdirectory_exclude_platforms(tcp_server)
     add_subdirectory_exclude_platforms(udp_beacon)
+    add_subdirectory_exclude_platforms(udp_server)
     add_subdirectory_exclude_platforms(http_client)
     add_subdirectory_exclude_platforms(mqtt)
 

pico_w/wifi/python_test_udp/python_test_udp_client.py

@@ -0,0 +1,31 @@
+import socket
+import time
+
+# === Configuration ===
+PICO_IP = "PI_IP_HERE!"  # Replace with your Pico's IP
+PICO_PORT = 12345       # Port Pico is listening on
+
+# === Data to send ===
+data = {
+    "1": " Message 1 received!",
+    "2": " Message 2 received!",
+    "3": " Message 3 received!",
+    "4": " Message 4 received!",
+    "5": " Message 5 received!"
+}
+
+# === Create UDP socket ===
+sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
+
+try:
+    for key, value in data.items():
+        message = f"{key}:{value}"
+        print(f"Sending to {PICO_IP}:{PICO_PORT} -> {message}")
+        sock.sendto(message.encode(), (PICO_IP, PICO_PORT))
+        time.sleep(0.1)  # slight delay to prevent message loss
+
+except Exception as e:
+    print(f"Error: {e}")
+
+finally:
+    sock.close()

pico_w/wifi/udp_server/CMakeLists.txt

@@ -0,0 +1,43 @@
+# Threadsafe
+
+add_executable(picow_udp_server_background
+        picow_udp_server.c
+        )
+target_compile_definitions(picow_udp_server_background PRIVATE
+        WIFI_SSID=\"${WIFI_SSID}\"
+        WIFI_PASSWORD=\"${WIFI_PASSWORD}\"
+        )
+target_include_directories(picow_udp_server_background PRIVATE
+        ${CMAKE_CURRENT_LIST_DIR}
+        ${CMAKE_CURRENT_LIST_DIR}/.. # for the common lwipopts.h
+        )
+target_link_libraries(picow_udp_server_background
+        pico_cyw43_arch_lwip_threadsafe_background
+        pico_stdlib
+        )
+
+pico_add_extra_outputs(picow_udp_server_background)
+
+pico_enable_stdio_usb(picow_udp_server_background 1)
+
+# Manual polling
+
+add_executable(picow_udp_server_poll
+        picow_udp_server.c
+        )
+target_compile_definitions(picow_udp_server_poll PRIVATE
+        WIFI_SSID=\"${WIFI_SSID}\"
+        WIFI_PASSWORD=\"${WIFI_PASSWORD}\"
+        )
+target_include_directories(picow_udp_server_poll PRIVATE
+        ${CMAKE_CURRENT_LIST_DIR}
+        ${CMAKE_CURRENT_LIST_DIR}/.. # for our common lwipopts
+        )
+target_link_libraries(picow_udp_server_poll
+        pico_cyw43_arch_lwip_poll
+        pico_stdlib
+        )
+
+pico_add_extra_outputs(picow_udp_server_poll)
+
+pico_enable_stdio_usb(picow_udp_server_poll 1)

pico_w/wifi/udp_server/lwipopts.h

@@ -0,0 +1,10 @@
+#ifndef _LWIPOPTS_H
+#define _LWIPOPTS_H
+
+// Generally you would define your own explicit list of lwIP options
+// (see https://www.nongnu.org/lwip/2_1_x/group__lwip__opts.html)
+//
+// This example uses a common include to avoid repetition
+#include "lwipopts_examples_common.h"
+
+#endif