Handle problems during connection with a timeout

[fdlamotte]

Here is a first pull request with workarounds dealing with connection issues I had with my phone :

• fantom connections when looping
• communication stalled during or just after connection (usually I was getting send(10) msg so it was asking for button I think ;))

Note that I tried to make it work on my laptop but while I could pair with the watch, I've never been able to setup a proper connection, the watch stops trying to connect before the laptop connects ! (even with no timeout ...) so quality of connection depends a lot on the bluetooth chip server side ...

Not tested on a pi, as I have some but they are not setup. Did the tests on a oneplus 6 with postmarketos.

If this PR is accepted, I have some ideas on how to handle the actions linked with the watch in a more generic way than what I did on sxmo_gshock and I'll propose it afterwards. I think in the end it could even handle all the use cases I address on sxmo_gshock ;)