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Merge branch 'bugfix/freemodbus_fix_long_frame_buffer_failure_backport4_0' into 'release/v4.0'

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freemodbus: freemodbus fix long frame buffer failure (backport v4.0)

See merge request espressif/esp-idf!8199
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Michael (XIAO Xufeng)
2020-09-02 16:12:28 +08:00
parent c756f7c4d2 6932b4d1c0
commit d1fa5c712a
5 changed files with 253 additions and 1 deletions
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components/freemodbus/README.rst Normal file
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# 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.