Made changes and tested transmission and reception.
Note:
TX to T1000E would not work direct, but always went through a repeater.
TX to two Thinknode M1's went through direct..
* 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.