add bearpi_micropython doc and scripts

examples/micropython_demo/scripts/tcp.py

@@ -0,0 +1,36 @@
+import network
+import umachine as machine
+import usocket as socket
+import utime as time    
+
+WIFI_SSID='KYzhang'
+WIFI_PASSWORD='kyzhangx'
+SERVER_HOST='117.50.111.72'
+SERVER_PORT=8001
+
+if __name__ == '__main__':
+
+    # register esp8266 as NIC
+    uart0 = machine.UART(0)             # BearPi LPUART1
+    esp8266 = network.ESP8266(uart0)
+    print("esp8266 init done")
+    esp8266.connect(ssid=WIFI_SSID, pwd=WIFI_PASSWORD)
+    print("esp8266 connect done")
+
+    # get socket and establish tcp connection
+    tcp_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+    print("socket init done")
+    tcp_socket.connect((SERVER_HOST, SERVER_PORT))
+    print("socket connect done")
+
+    # tcp send and receive
+    cnt = 0
+    while cnt < 5:
+        send_len = tcp_socket.send("This is TCP test!\n")
+        print(f"send len:{send_len}")
+        data = tcp_socket.recv(1024)
+        if not data:
+            break
+        print(f"recv data:{data}")
+        cnt += 1
+        time.sleep(0.5)