7 years, 3 months ago.

mbed 5 network sockets return code -3012.

The page for network sockets https://docs.mbed.com/docs/mbed-os-api-reference/en/latest/APIs/communication/network_sockets/ says that you can get error return codes from -3001 to -3011 but I keep getting -3012. The only other code I can get is -3001. My program is fairly standard, I'm just trying to setup up a to connection between a board and my laptop using an esp8266. It generally works, but I'm just trying to improve it's stability (i.e. getting it to reconnect if there is a problem). However when I do something like close the socket on my computer, or turn off the WiFi network, i get exactly the same code: -3012. Is it because esp8266 has bad error handling or something? I've kind of just accepted that all i can get is -3001 and for all other errors it returns -3012, but I can't actually find anything on the internet to support this. I won't post all my code as there is several hundred lines, but the important thing is that is works, and then if turn off the WiFi it returns -3012, whereas i think it should return -3004.

Thanks.