This plugins receives packages with type "kdeconnect.connectivity_report" and reads the
following fields:

signalStrengths (object<string, object>): Maps each SIM (subscription ID) to the following object:
    networkType (string):
        One of "5G", "LTE", "CDMA", "EDGE", "GPRS", "GSM", "HSPA", "UMTS", "CDMA2000", "iDEN", "Unknown"
    signalStrength (int) [0..=4]: The signal strength

It also sends empty packages with type kdeconnect.connectivity_report.request
to ask the peer device to send a package like the mentioned above.