Posting data to a third party mobile app

[sydneyloteria]

We have a IOS App developed. It is feasible or possible to post the data from fitbit watch for example the gyroscope, accelerometer etc. to the API and saved it to our database?

[Gondwana]

Yes, but it's very difficult. You can use fetch() or WebSocket to send data from Fitbit companion code. I've had it pumping out accelerometer at 30Hz.

The hardest part at the moment is satisfying security requirements; Fitbit insists on https except for the equivalent of localhost. If your iOS app runs on the same device as the Fitbit app, you may be okay.

Be aware that many Fitbits don't have gyroscopes.