App stalled when failing to connect to flora ble device

[Djebouh]

Hello,

This may relate to #9 .
As BLEClient::connect is a blocking call, "floraClient->connect(floraAddress)" never returns if the device can't be reached.
The application therefore goes in hibernate but doesn't operate.

To workaround this, one could scan the network when initializing the bluetooth and then ignore the devices that could not be found at scan time. What do you think ?

[jaakla]

In general it would be better to scan all visible devices and then report data for all of them, instead of using fixed list of BTLE addresses.

[sidddy]

I'll check the PR, thanks for the suggestion!