Streaming acceleromer data? about sleep-as-android-garmin-addon

[Artaud]

Hi, yes, actually this is the core feature of the app. Well almost, we do 10 second aggregates on the watch, but realtime streaming is the same if you omit the aggregation. Realtime streaming would however put a larger strain on the battery.

[tjthejuggler]

Oh this is great news. I want to make a juggling catch counter and if I can just get the accel data streamed over to a companion app I'm pretty sure I can do it. Thanks so much for the response, hopefully I can disect this enough to get the accel stuff from it. If you have any guidance I would certainly appreciate it, but no worries if not, just knowing that it is possible and that the way to do it is here is a huge help, I really appreciate your response.

[Artaud]

Sure, it's pretty easy. The first part is to start the accelerometer and begin listening to data from it, the second part is to send that data to your phone.
Below is a naive implementation which sends the data to the phone as fast as they're collected (I really do not recommend using it as it is because the garmin messaging protocol cannot handle too frequent messages. I have workarounds for it and can tell you more if interested but try to test this and you'll know what I'm talking about).

// Make sure to have your commListener registered

    function startSensor() {

		var options = {
			:period => 4,
			:accelerometer => {
				:enabled => true,
				:sampleRate => 10
			},
		};
        Sensor.registerSensorDataListener(method(:onData), options);
    }

function onData(sensorData) {
    sendAccelData(sensorData.accelerometerData.x, sensorData.accelerometerData.y, sensorData.accelerometerData.z);
}

function sendAccelData(x,y,z) {
    Communications.transmit(x+","+y+","+z, {}, self.commListener);
}

[tjthejuggler]

Thanks so much for this! My current plan of attack was to just try and strip everything away from the sleep apps until I was left with just accel stuff, but there is so much in there, so building up from accel stuff is definitely preferable.

I put this code into a simple number selector watch app that I know runs. I got an error about commListener being undefined, so I found someone else code defining it as an extension of Communications.ConnectionListener and that at least made the error go away. I also got the permissions added to the manifest.

Now I am getting this error on 'Sensor.registerSensorDataListener(method(:onData), options);' and am not able to build the app:

Invalid '$.Toybox.Lang.Method(sensorData as Any) as Any' passed as parameter 1 of type '$.Toybox.Lang.Method(data as $.Toybox.Sensor.SensorData) as Void'.

---

//
// Copyright 2015-2021 by Garmin Ltd. or its subsidiaries.
// Subject to Garmin SDK License Agreement and Wearables
// Application Developer Agreement.
//

import Toybox.Application;
import Toybox.Lang;
import Toybox.WatchUi;
import Toybox.Communications;
import Toybox.Sensor;

//! This app demonstrates how to use the Number Picker.

class NumberPickerApp extends Application.AppBase {

// TODO: dedupe
(:background)
class commListener extends Communications.ConnectionListener {
function initialize() {
    Communications.ConnectionListener.initialize();
}
function onComplete() {
    System.println("Transmit Complete");
}

function onError() {
    System.println("Transmit Failed");
}
}


//! Constructor
public function initialize() {
    AppBase.initialize();
}

//! Handle app startup
//! @param state Startup arguments
public function onStart(state as Dictionary?) as Void {
    startSensor();
}

//! Handle app shutdown
//! @param state Shutdown arguments
public function onStop(state as Dictionary?) as Void {
}

//! Return the initial views for the app
//! @return Array Pair [View, InputDelegate]
public function getInitialView() as Array<Views or InputDelegates>? {
    var view = new $.NumberPickerView();
    var delegate = new $.BaseInputDelegate(view);
    return [view, delegate] as Array<Views or InputDelegates>;
}

// Make sure to have your commListener registered

public function startSensor() {

	var options = {
		:period => 4,
		:accelerometer => {
			:enabled => true,
			:sampleRate => 10
		},
	};
    Sensor.registerSensorDataListener(method(:onData), options);
}

public function onData(sensorData) {
    sendAccelData(sensorData.accelerometerData.x, sensorData.accelerometerData.y, sensorData.accelerometerData.z);
}

public function sendAccelData(x,y,z) {
    Communications.transmit(x+","+y+","+z, {}, self.commListener);
}

}

Thanks again, I really appreciate your help!

[Artaud]

Ah, okay, that's because strict typing was brought to Monkey C after I wrote this. You can either lessen the strictness of the type system by compiling with -l 2 flag, or you'll have to provide types for everything. I'll take a look at that.

[Artaud]

    public function onData(sensorData as Sensor.SensorData) as Void {
        sendAccelData(sensorData.accelerometerData.x, sensorData.accelerometerData.y, sensorData.accelerometerData.z);
    }

    public function sendAccelData(x as Lang.Array<Lang.Number>,y as Lang.Array<Lang.Number>,z as Lang.Array<Lang.Number>) {
        Communications.transmit(x+","+y+","+z, {}, new commListener());
    }

[Artaud]

this might work

[tjthejuggler]

You are a wizard! That fixed the error and it built. I'm going to work on the android end of things now. Thank you so much for your help with this, I really appreciate it!

[Artaud]

LOL :) Glad to help, good luck with the app :)