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These files contain static functions that will cause unused function warnings when ModbusMaster.h is included by applications.
The library only returns an error code with no other explanation so it's impossible to debug unexpected errors in communication such as: - Receiving continuous noise on the line (missing ground wire) - Receiving additional zero bytes (missing bias resistors) Allow callback functions to be specified so that messages can be logged for debugging.
A slave device could indicate that there are 255 bytes in the response here: u8BytesLeft = u8ModbusADU[2]; There are only 256 bytes of space in ModbusADU so the additional 255 bytes would overflow the buffer. Increase the size of ModbusADUSize so that it is large enough to handle the byte at index 255 without wrapping around to 0, and use it to check that there is enough space for the response. When we run out of space, return a new error type ku8MBResponseTooLarge (0xE4).
If Stream::read() returns -1 then 0xFF will be added to the buffer. Check the return value before using it as data.
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Some fixes for v2.01 based on testing with a slave device: