espalarm Code

Set initial alarm state when two nodes see each other for the first time.
Fix null pointer problem.

Proxy to the power switch : document and make configurable.

Simplistic forwarder for my esp8266 power switch

sync repo with work in progress

Make function public for reuse.
Change feedback to the app to include armed status.

Include support to save FCM device keys on LittleFS storage, and have the phones register
themselves remotely via a secure JSON query.

Remove hardcoded cert dead code

Send FCM message to a channel.
Add a bit of doc.

Remove whatsapp some more

Replace whatsapp by firebase cloud messaging.
Conditional compilation to make for a non-OLED communication device.
Replace dependency on one root certificate by cert bundles.