After a power failure at my home, Raspberry Pi with EmonCms wia WIFI does not work (only LAN connection works). When I re scaned wifi, my acces point not present. Only surroundings AP with signal level about -90…-79dBm are available. My wifi signal strength is -47dBm and my mobile or tablets works fine. My Raspberry Pi is about 6m far off the my AP.
Problem solved. I turned off the security and re-set the security on the router, and my AP is “visible” to my Raspberry Pi with emoncms…