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(RFC-compliance: Issue834) Fix the Violation of the requirement of Unit Identifier. #835

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(RFC-compliance: Issue834) Fix the Violation of the requirement of Unit Identifier. #835

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6 changes: 6 additions & 0 deletions src/modbus.c
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Original file line number Diff line number Diff line change
Expand Up @@ -806,6 +806,12 @@ int modbus_reply(modbus_t *ctx,
sft.function = function;
sft.t_id = ctx->backend->get_response_tid(req);

if (slave != 0 && slave != 255) {
errno = EINVAL;
printf("The Unit Identifier must be 0x00 or 0xFF\n");
return -1;
}

/* Data are flushed on illegal number of values errors. */
switch (function) {
case MODBUS_FC_READ_COILS:
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