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modbus-tcp: check if response slave id matches request slave id #871

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modbus-tcp: check if response slave id matches request slave id #871

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12 changes: 12 additions & 0 deletions src/modbus-tcp.c
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Original file line number Diff line number Diff line change
Expand Up @@ -225,6 +225,18 @@ static int _modbus_tcp_pre_check_confirmation(modbus_t *ctx,
return -1;
}

/* Check if response slave ID matches request slave ID*/
if (req[6] != rsp[6]) {
if (ctx->debug) {
fprintf(stderr,
"The responding slave %d isn't the requested slave %d\n",
rsp[6],
req[6]);
}
errno = EMBBADSLAVE;
return -1;
}

return 0;
}

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