Logging

idafroseth · October 2017

Hi,

can someone help me understand how to use the logging module?

I have configured my MetaWear R board to log SensorFusion.quaternion when the user click the button. The logging is stopped when the user click the button the second time. This seems to work. The next thing I want to achieve is to download the logged data. I have implemented this using the example in the documentation:

public void downloadLoggedData() {
    // download log data and send 100 progress updates during the download
    loggingModule.downloadAsync(100, new Logging.LogDownloadUpdateHandler() {
        @Override
        public void receivedUpdate(long nEntriesLeft, long totalEntries) {
            Log.i("MainActivity", "Download progress Update = " + nEntriesLeft + "/" + totalEntries);
        }
    }).continueWithTask(new Continuation<Void, Task<Void>>() {
        @Override
        public Task<Void> then(Task<Void> task) throws Exception {
            Log.i("MainActivity", "Download completed " );
            loggingModule.clearEntries();
            return null;
        }
    });
}

I see that data is being downloaded since the LogDownloadUpdateHandler outputs the number of entries. However I do not understand how I am going to get a hold of the data? My Subscriber.apply() does not output anything and the task.getResult returns null?

I am new to the Bolts framework so please bear with me.

Ida

idafroseth · October 2017

I am able to fetch the data through the subscriber as long as I do not restart the application. Should I save the session to the board in some way after configuring the board to log data when clicking the onboard button?

Eric · October 2017

See this section in the documentation:

https://mbientlab.com/androiddocs/3/advanced_features.html#serialization

idafroseth · October 2017

Thanks. This works for persisting the data when doing both streaming and logging data. However when I log data, it seems like my Subscriber is "lost" when I reconnect the board or restart the app. Before a reconnect I see both the Download progress and the data in the console, however after a reconnect I only see the download progress. Any suggestion on what I am doing wrong?

***The Subscriber works after restarting the app when I use source.stream instead of source.log***

Eric · October 2017

Post the MetaWear code you are currently running.

idafroseth · October 2017

The code:https://pastebin.com/Bgps926n 

The connection and configuration of the board starts when the user selects a board in the GuI and the following callback is called:
onBleDeviceSelected(String deviceAddress)

Eric · October 2017

I don't see any calls to serialize or deserialize in your code. Also, a subscriber's environment should be set when you're ready to download the data.

Logging

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