modbus_receive.md 926 B
modbus_receive
Name
modbus_receive - receive an indication request
Synopsis
int modbus_receive(modbus_t *'ctx', uint8_t *'req');
Description
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.