Send the collected accelerometer data to the phone for future use by diverse phone applications.
Some considerations:
Polling will be easier to implement than pushing, so the phone app will decide how often to refresh its data. The watch can bufferize the latest values and send them by request.
Raw data is preferable, so that will be the phone app to analyze the data, because the algorithms can be power consuming. Data preparation such as resampling can be made on the phone.
Do not know if it is supported by the hardware sensor, several modes of sampling frequency can be defined and switched depending on the app. Some of them require average values during several seconds, some can track movements, so ~5fps needed.
Send the collected accelerometer data to the phone for future use by diverse phone applications. Some considerations: