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44832d2379
allows to avoid issues with modbus processing when higher priority tasks are used in user application
# 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.