just some excerpt from the documentation of the wifi in esp8266 arduino ide
### Enable Wi-Fi Diagnostic
By default the diagnostic output from Wi-Fi libraries is disabled when you call `Serial.begin`. To enable debug output again, call `Serial.setDebugOutput(true)`. To redirect debug output to `Serial1` instead, call `Serial1.setDebugOutput(true)`. For additional details regarding diagnostics using serial ports please refer to [documentation](https://github.com/esp8266/Arduino/blob/master/doc/reference.md).
Below is an example of output for sample sketch discussed in [Quick Start](#quick-start) above with `Serial.setDebugOutput(true)`:
```
Connectingscandone
state: 0 -> 2 (b0)
state: 2 -> 3 (0)
state: 3 -> 5 (10)
add 0
aid 1
cnt
connected with sensor-net, channel 6
dhcp client start...
chg_B1:-40
...ip:192.168.1.10,mask:255.255.255.0,gw:192.168.1.9
.
Connected, IP address: 192.168.1.10
```
The same sketch without `Serial.setDebugOutput(true)` will print out only the following:
```
Connecting....
Connected, IP address: 192.168.1.10
```
### Enable Debugging in IDE
Arduino IDE provides convenient method to [enable debugging](https://github.com/esp8266/Arduino/blob/master/doc/Troubleshooting/debugging.md) for specific libraries.