1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
|
# modbus_receive
## Name
modbus_receive - receive an indication request
## Synopsis
```c
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](modbus_set_socket.md).
## 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
- [modbus_set_socket](modbus_set_socket.md)
- [modbus_reply](modbus_reply.md)
|
