* new: SensorManager

* BasChatMesh: new onContactRequest(), for PAYLOAD_TYPE_REQ handling.
* companion, repeater and room_server: now with basic 'plumbing' to handle REQ_TYPE_GET_TELEMETRY_DATA (0x03).
* dependency: added CayenneLPP to libdeps
* all target.* modules now with a stub 'sensors' object.

variants/generic_espnow/target.cpp

@@ -7,6 +7,7 @@ ESP32Board board;
 ESPNOWRadio radio_driver;
 
 ESP32RTCClock rtc_clock;
+SensorManager sensors;
 
 bool radio_init() {
   rtc_clock.begin();