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# modbus_set_indication_timeout
## Name
modbus_set_indication_timeout - set timeout between indications
## Synopsis
```c
void modbus_set_indication_timeout(modbus_t *ctx, uint32_t to_sec, uint32_t to_usec);
```
## Description
The *modbus_set_indication_timeout()* function shall set the timeout interval used by
a server to wait for a request from a client.
The value of `to_usec` argument must be in the range 0 to 999999.
If both `to_sec` and `to_usec` are zero, this timeout will not be used at all.
In this case, the server will wait forever.
## Return value
The function shall return 0 if successful. Otherwise it shall return -1 and set
errno.
## Errors
- *EINVAL*, the argument `ctx` is NULL or `to_usec` is larger than 1000000.
## See also
- [modbus_get_indication_timeout](modbus_get_indication_timeout.md)
- [modbus_get_response_timeout](modbus_get_response_timeout.md)
- [modbus_set_response_timeout](modbus_set_response_timeout.md)
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