first and compiling freertos

docs/examples/eth_code/Python/RP2040-ETH-Demo/RP2040-ETH-Demo.py

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+from machine import UART, Pin
+from mqtt_client import MQTTClient
+from ch9120 import CH9120
+import time
+
+# CH9120
+MODE = 1  #0:TCP Server 1:TCP Client 2:UDP Server 3:UDP Client
+GATEWAY = (192, 168, 1, 1)    # GATEWAY
+TARGET_IP = (192, 168, 1, 10) # TARGET_IP
+LOCAL_IP = (192, 168, 1, 200) # LOCAL_IP
+SUBNET_MASK = (255,255,255,0) # SUBNET_MASK
+LOCAL_PORT1 = 1000            # LOCAL_PORT1
+TARGET_PORT = 2000            # TARGET_PORT
+BAUD_RATE = 115200            # BAUD_RATE
+
+uart1 = UART(1, baudrate=9600, tx=Pin(20), rx=Pin(21))
+
+def ch9120_configure():
+    # Configure
+    global uart1 
+    ch9120 = CH9120(uart1)
+    ch9120.enter_config() # enter configuration mode
+    ch9120.set_mode(MODE)    # 0:TCP Server 1:TCP Client 2:UDP Server 3:UDP Client
+    ch9120.set_localIP(LOCAL_IP)
+    ch9120.set_subnetMask(SUBNET_MASK)
+    ch9120.set_gateway(GATEWAY)
+    ch9120.set_localPort(LOCAL_PORT1)
+    ch9120.set_targetIP(TARGET_IP)
+    ch9120.set_targetPort(TARGET_PORT)
+    ch9120.set_baudRate(BAUD_RATE)
+    ch9120.exit_config()  # exit configuration mode
+    
+    # Clear cache and reconfigure uart1
+    uart1.read(uart1.any())
+    time.sleep(0.5)
+    uart1 = UART(1, baudrate=115200, tx=Pin(20), rx=Pin(21))
+    
+if __name__ == "__main__":
+    ch9120_configure()
+    while True:
+        time.sleep(0.1)
+        while uart1.any() > 0:
+            rxData1 = uart1.read(uart1.any())
+            uart1.write(rxData1)
+            print(rxData1.decode('utf8'))