Error code in app loader?

[RKBoss6]

Recently I've been getting an error code in the BlueWatch app loader when trying to upload an app. Upload of Workouts and Activities (workouts) failed, Unexpected response "\u0013\u0011OK The app in question is an app I'm testing that's not on the app loader, but it has happened before with other apps. What does the error code mean? It happens right before the upload finishes, and the upload isn't on the watch anywhere after that.

[gfwilliams]

I just checked, and it's flow control.

• 0x13 = char code 19 - XOFF
• 0x11=char code 17 - XON

It's what happens when your app sends data to the Bangle faster than it's able to process it, and the Bangle asks the app to stop sending for a bit.

I'm actually kind of surprised we haven't hit this with Android. The intention was that we used the UART.js library which handles this natively: https://github.com/espruino/EspruinoWebTools/blob/master/uart.js#L494-L500

But at least on the Android version (which I guess you're copying) we instead create a fake Puck.js library (which is the old one).

You should be able to use the UART library but overwrite the endpoint, so then you're able to use all the existing UART.js code (which would enable packet transfers which will be faster too). There's an example of doing it for the emulator at https://github.com/espruino/BangleApps/blob/master/emulator.js#L65-L119

So you basically just want to swap https://github.com/espruino/BangleApps/blob/master/android.html#L251-L357 for https://github.com/espruino/BangleApps/blob/master/emulator.js#L65-L119 - it should make things simpler as UART.js should handle all the queueing/splitting/etc