Investigate continuous monitoring of RSSI (ScanResult.level) in dBm

[pwittchen]

Investigate continuous monitoring of ScanResult.level (RSSI) in dBm. Not only when WiFi signal strength changes (what is indicated by system broadcast), but all the time within a given interval.

Draft of proposed API (it may change):

Observable<Integer> observeRssiOfConnectedAp();
Observable<Integer> observeRssiOfConnectedAp(int observingIntervalInMs);
Observable<Integer> observeRssi(String accessPoint);
Observable<Integer> observeRssi(String accessPoint, int observingIntervalInMs);

References:
https://developer.android.com/reference/android/net/wifi/ScanResult.html