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# modbus_set_debug
## Name
modbus_set_debug - set debug flag of the context
## Synopsis
```c
int modbus_set_debug(modbus_t *ctx, int flag);
```
## Description
The *modbus_set_debug()* function shall set the debug flag of the *modbus_t*
context by using the argument `flag`. By default, the boolean flag is set to
`FALSE`. When the `flag` value is set to `TRUE`, many verbose messages are
displayed on stdout and stderr. For example, this flag is useful to display the
bytes of the Modbus messages.
```text
[00][14][00][00][00][06][12][03][00][6B][00][03]
Waiting for a confirmation...
<00><14><00><00><00><09><12><03><06><02><2B><00><00><00><00>
```
## Return value
The function shall return 0 if successful. Otherwise it shall return -1 and set errno.
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