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# Serial to Ethernet

This example shows how to transfer data between serial port and ethernet.

## Required hardware
* A supported target -
 [NuMaker-IoT-M487](https://os.mbed.com/platforms/NUMAKER-IOT-M487/)
 [NuMaker-PFM-M487](https://os.mbed.com/platforms/NUMAKER-PFM-M487/)
 [Numaker-PFM-NUC472](https://os.mbed.com/platforms/Nuvoton-NUC472/)
 
* MicroSD card is optional. It uses to store configuration when existed.

## Compile Settings

* Default socket number is 4, please add following settings to mbed_app.json to increase it.

    "target_overrides": {
        "*": {
          "lwip.socket-max": 8,
          "lwip.tcp-socket-max": 8, 
          "lwip.udp-socket-max": 8          
        }

## Configuration

* Following configurations are set in ste_config.h

ENABLE_WEB_CONFIG
    Define ENABLE_WEB_CONFIG to active a simple web server for UART ports and Ethernet port configuration.

MAX_UART_PORTS
    Maximum UART ports supported. It should be 1, 2, or 3. Please also define mapping table "port_config[]" in main.c

DEFAULT_UART_BAUD
    Default UART baud

NET_PORT_BASE
    Network base port number to listen. The base port maps to the 1st UART port, the (base port + 1) maps to the 2nd UART port, etc.

SER_CONFIG_FILE // for serial ports
NET_CONFIG_FILE // for network
    Files in SD card to store settings via web configuration

MAX_SERVER_ADDRESS_SIZE
    Maximum size of server address for web configuration

MAX_IPV4_ADDRESS_SIZE
Maximum size of IP address for web configuration