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modbus_receive - receive an indication request


int modbus_receive(modbus_t *'ctx', uint8_t *'req');


The modbus_receive() function shall receive an indication request from the socket of the context ctx. This function is used by a Modbus slave/server to receive and analyze indication request sent by the masters/clients.

If you need to use another socket or file descriptor than the one defined in the context ctx, see the function modbus_set_socket.

Return value

The function shall store the indication request in req and return the request length if successful. The returned request length can be zero if the indication request is ignored (eg. a query for another slave in RTU mode). Otherwise it shall return -1 and set errno.

See also