connect mode: ap_only, sta_only, sta_ap mode

ESP8266 support different operation modes: AP only, STA only and both enabled. painlessMesh supports these modes three different modes. The main case were this is useful is for:

• Battery supplied nodes. A node that is running from battery must use deep sleep to extend runtime. It will only be active during a short time every some minutes or hours. They should not expose AP interface to mesh to avoid connection failures.

It could theoretically also be used to have your node be connected to the mesh as AP or STA only, but there are some caveats the user should be aware of:

• ...