I have an unusual problem with our ESP-06 project.
It appears that in some buildings (i.e. some WIFI environments) the wifi_station_scan() does not return any SSIDs when I know there should be.
For example, the SSID scan works fine here at work, but does not work at home (or at a colleagues home). There is nothing remarkable about our houses (I live in a small residential estate, a colleague lives deep in the countryside).
This isn't a random event. The SSID Scan fails consistently at our addresses, but will consistently work in the office.
Interestingly, the SSID scan DID work with SDK version 1.3.0, but we had to upgrade to v1.4.0 due to compatibility issues with some laptop WIFI cards (which SDK 1.4.0 successfully resolved).
I upgraded to SDK version 1.5.0 a few days ago and recompiled, but the new code still does not scan SSIDs properly in certain locations.
Has anyone else come across this?