Help Required To Automatically Reconnect to BLE Browser

[espruino-discuss2]

Posted at 2023-08-21 by user156292

Hi (help !),
I am struggling to make the BangleJS automatically reconnect to my BLE browser (on my iPhone or on my Raspberry-Pi).
Initial connection is good but when I move the watch out of BLE range and then move it back again I would like it to reconnect automatically.

I have tried adding the following to my copy of UART.js:-

device.addEventListener('gattserverdisconnected', function disconnected() {
            setTimeout(reconnect,180000);
            function reconnect()
            {device.gatt.connect();}});

The event fires and the browser displays a bluetooth icon as though it is connected but I seem to have lost the UART object because data transfers will not work afterwards.
If anyone has any ideas I would be very grateful !
Thanks very much :-)
Mark

[espruino-discuss2]

Posted at 2023-08-21 by @fanoush

There is a lot to do after doing device.gatt.connect()
see everything below this https://github.com/espruino/EspruinoWebTools/blob/master/uart.js#L209

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Posted at 2023-08-22 by user156292

Thanks for your reply, I can see what you mean, there is a lot to do to the connection.
I'm hoping to find a quick way of reconnecting to the previous connection but if not then I can hopefully do it the long way.
Thanks :-)

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Posted at 2023-08-29 by @gfwilliams

Sorry, it looks like that's not implemented in UART.js, however you could look at using the Puck.js library which is very similar.

In it there is a connection.reconnect method which should do what you need:
https://github.com/espruino/EspruinoWebTools/blob/master/puck.js#L236

So you may not even have to change the file, you can do connection = Puck.connect() to get the connection, then connection.device.addEventListener... and connection.reconnect()