Are these projects viable for Bangle.js?

[espruino-discuss2]

Posted at 2023-07-03 by user155888

Hello,

Bangle.js looks like a very interesting platform. I have ideas for a couple projects which I want to make sure are viable before I spend $90 USD for the watch though. I'm willing to do the development work as long as someone tells me it's possible:

1. Termux command launcher: Termux is a terminal emulator for Android with a lot of capability. It has an array of *nix packages including Python. What I want to do is make a menu on the Bangle where each item is a script (Bash/Python/etc.) In Termux and tapping it will execute that script on the Android device. I read about how intents can be sent and was wondering if the modified Bangle.js GadgetBridge app can request Termux's RUN_COMMAND permission detailed here

2. Get heart rate and step data from the Bangle to Termux- I'm not sure how this would work exactly, but Termux has a version of am for sending intents which I've successfully used for integrating with Android automation apps.

[espruino-discuss2]

Posted at 2023-07-03 by @gfwilliams

Hi,

Looking at that reference, yes, I'd be pretty sure that's fine - just a matter of copy/pasting what that document you found shows into http://www.espruino.com/Gadgetbridge#intents

For sending the data, I don't know for sure but it looks like you can run a script with arbitrary arguments from an Intent, so I guess sending the data would just be a matter of sending the intent with the HRM/step data.

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Posted at 2023-07-06 by user155888

Hi Gordon,

Thank you for the confirmation. I've started a PR on gadget bridge. I'm hoping to pick your brain again: My first project idea seems pretty similar in scope to espruinoterm, which you authored a year ago. Could espruinoterm be extended to allow for a Termux command launcher? It seems we both had the idea of presaved commands being sent from the Bangle to another device. Additionally, some commands in Termux could send output back to the watch via GadgetBridge (once I complete the code for this).

1. Does espruinoterm support Unicode in output?
2. Is there a history line/byte limit for espruinoterm to prevent the device from running out of memory?

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Posted at 2023-07-06 by @gfwilliams

Hi,

Does espruinoterm support Unicode in output?

No, however there is an E.decodeUTF8 command in Espruino to help you deal with UTF8 strings, and actually the most recent cutting edge builds have UTF8 support in them (although you'd still have to handle the input character by character and then use E.asUTF8 to convert the raw data to a Unicode string).

Is there a history line/byte limit for espruinoterm to prevent the device from running out of memory?

No - I think the VT100 module used there (http://www.espruino.com/VT100) renders direct to the screen buffer so there's no scrollback history in it. But you could potentially create an offscreen Graphics buffer, use the VT100 module and then just scroll the buffer