Espruino Central, multiple peripherals?

[espruino-discuss]

Posted at 2018-10-17 by billsalt

Probably @gfwilliams: Can an Espruino central connect/control more than 1 peripheral?

[gfwilliams]

Posted at 2018-10-17 by @gfwilliams

Not at the same time, no.

It is possible to do it in the Espruino firmware with some work (and the amount of vars for code may have to be removed a bit), but right now it's not something you can do with the current firmware.

[espruino-discuss]

Posted at 2020-03-27 by benoit

Hi guys,

Any update on billsalt's question ? Is it still impossible yet ?

Best regards.

[espruino-discuss]

Posted at 2020-03-27 by Robin

Fri 2020.03.27

@benoit Is this inquiry a continuation of this thread?

Posted on Sat 11th, February 2017    Notification of a puck as a Central?

or, is the peripheral request related to nRF52 PPI?

[espruino-discuss]

Posted at 2020-03-27 by benoit

Sorry if it wasn't clear. My question is: is it possible - with one puck.js and using Espruino - to connect several BLE peripherals and subscribe to their characteristics ?

[gfwilliams]

Posted at 2020-03-27 by @gfwilliams

It's not possible at the moment, no...

[espruino-discuss]

Posted at 2020-03-30 by benoit

Ok, sad =/

Is it because of a webBluetooth limitation or because Espruino doesn't use Nordic sdk S132 or S140 ? --> https://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.sdk5.v15.0.0%2Fble_sdk_app_multilink.html

Is this feature planned in a future Espruino version ?

[gfwilliams]

Posted at 2020-03-30 by @gfwilliams

The softdevice can do it, but in order to enable it the softdevice needs more RAM, so it's less RAM available for JS applications.

If a lot of people want it then it could be added for sure, but it's nontrivial as many of the functionality currently assumes max:1 connection - right now I've just had other priorities, but the code is all open so someone else could add it if they wanted.

[espruino-discuss]

Posted at 2020-03-30 by benoit

Thanks for the explanations.
One last question: do you think this feature be implemented with inline C? Or is it too complicated?

[gfwilliams]

Posted at 2020-03-30 by @gfwilliams

Too complicated - since the softdevice needs more RAM, the whole of Espruino needs to move addresses.

One of the reasons it's not being prioritised - it might be useful for maybe 5% of users, but it'll reduce available memory for 100% of users, all of the time.

[espruino-discuss]

Posted at 2020-03-30 by benoit

I understand, thanks for the details. I will look for other solutions.
Best regards.