# Modbus Server User-Defined Function Example 1. CustomModbusServer class inherits ModbusServer class and overrides ReadRtuData and HandleRequest methods to implement user-defined function with function code 100 that receives 1 byte and responds with the same byte + data array of random byte values (the array size is determined by the received value). 2. CustomModbusServer is created with UART0 as a port, Modbus RTU protocol and station address 1. 3. UART0 is initialized. 4. UART0 parameters are set to 115200 bps, 8 data bits, even parity, 1 stop bit and no flow control. 5. UART0 is enabled. 6. CustomModbusServer is enabled.
To create a project from this example, run:
idf.py create-project-from-example "plasmapper/pl_modbus=1.0.1:server_user_defined_function"