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05d647a04a
freemodbus: fix invalid error handling for duplicate param key (backport v4.1) See merge request espressif/esp-idf!14786
# Modbus assumptions, dependencies and constraints 1. Current implementation of Modbus has limitation: maximum frame size should be less than 120 bytes (default UART receive FIFO full threshold value). This limitation is removed in ESP-IDF v4.2. 2. The only one instance of Modbus port can be initialized at the same time.