AntPlusListener events not firing

As I mentioned in another thread, make sure you are calling

Sensor.setEnabledSensors();  //provide an array of sensors your app uses

In a device/watch app, this is how the watch connects to a native sensor.

I believe problem is here:

_antplus_bpwr = new AntPlus.BikePower(null);

Instead of null, you should give instance of your BikePowerListener as listener parameter. However in this case, not sure how it should be. Perhaps 'self' ? I instanciate elsewhere in the code first my implementation of BikePowerListener, and then instanciate BikePower, using my listener instance as parameter.

Refer to:

developer.garmin.com/.../BikePower.html

Thank you Kurev.  The bike power object is working though - I can read data from the sensor, it is just the callback that isn't firing.

Jim, why then am I able to read data from the bike power sensor, even though I have not enabled it through the sensor class?  

I have to say the documentation is very poor, and lack of AntPlus examples make development very painful!  Thank you for your help though. Without that I would be really stuck.

Jim, I have tried this and makes no difference.

Would someone at Garmin be able to test my code and tell me why its not working?  Here is code with Sensor enabled as Jim suggests.

using Toybox.AntPlus;
using Toybox.System as Sys;
using Toybox.Sensor;

class antplus_bpwr extends AntPlus.BikePowerListener
{
	hidden var _antplus_bpwr;
	hidden var _antplus_listener;
	hidden var _sample_count;
	hidden var _samples;
	hidden var _head;
	hidden var _max_samples_count = 12;	
	
	function initialize()
	{
		// Initialise BSC device:
		BikePowerListener.initialize();
    	Sys.println("BWPR Initialized.");
    	Sensor.setEnabledSensors([Sensor.SENSOR_BIKEPOWER]);
		_antplus_bpwr = new AntPlus.BikePower(null);
		_sample_count = 0;
		_head = 0;
		_samples = new [_max_samples_count];
	}
	
	// Class to store data.  Currently just power but could be other stuff too.  
	// Keep like this for consistency.
	class bpwr_data
	{
		var power;
		function initialize()
		{
			power = 0;
		}
	}
	
	// Function to return bike power data object.
	function getBikePowerData()
	{
		var ret = new bpwr_data();
    	var info = _antplus_bpwr.getCalculatedPower();
    	if (info!=null)
    	{
    		if (info.power != null)
    		{
	    		if (info.power > 0)
	    		{
	    			ret.power = info.power;
	    		}
	    	}
    	}
    	return ret;
	}
	
	// Returns device number.
	function getDeviceNumber()
	{
		return _antplus_bpwr.getDeviceState().deviceNumber;
	}
	
	// Callback on power update.
	function onCalculatedPowerUpdate(data)
	{
		Sys.println("Updating power");
		_samples[_head] = data.power;
		if ((_sample_count + 1) < _max_samples_count)
		{
			_sample_count++;
		}
		_head++;
		if (_head == _max_samples_count)
		{
			_head = 0;
		}
	}
	
	// get average power.
	function getAvgPower()
	{
		var ret = 0;
		if (_sample_count == 0) {return ret;}
		for (var i=0;i<_sample_count;i++)
		{
			ret+=_samples[i];
		}
		ret/=_sample_count;
		return ret;
	}
	
}

I am expecting "Updating power" to print in the "onCalculatedPowerUpdate" function.

The callback should fire any time after initialising the class.

Are you only trying this in the sim, or on a real device?  If only the sim, try a real device.

Oh, and make sure the sensor is paired to the device and awake.

bgarrood said:

Thank you Kurev.  The bike power object is working though - I can read data from the sensor, it is just the callback that isn't firing.

That's exactly it. To use BikePower APIs like getBikePowerData(), you don't even need listener object if you only do polling. That's why it is working even if you give null as listener

If you want the callbacks coming to your listener though, you need to connect the BikePower and listener, and this is done as I described and is shown in BikePower API document.

// Assuming Valid BikePowerListener object "MyBikePowerListener"

// Initialize the AntPlus.BikePowerListener object
listener = new MyBikePowerListener();

// Initialize the AntPlus.BikePower object with a listener
bikePower = new AntPlus.BikePower(listener);

I have tried on both sim and real device, and neither work.  Sensor is of course paired and awake - as I say I am able to see the bike power data, but the event does not fire.

Thank you.

Try what Kurev is suggesting.  But you may not even need a listener.

Let's save you want both HR and Power, you can set a callback for Sensor data with Sensor.enableSensorEvents().  That way, you get a single callback for both sensors, about once a second.

Thats the ticket.  Thank you!