I own a Huawei band 6 and want to develop my own app to remote control the band and its sensors and then get data. Then I want to be able to send this data to a server through internet : to be able to access the health data (heart beat and Oximetry) of a remote patient.
If it seems more complicated, would it be easier to use Wear Os (Google) with another brand of the wearable ?
If you want to put an app directly onto the Huawei Band 6, it is currently not open to developers.
You can find a list of devices that are currently open to developers here. https://developer.huawei.com/consumer/en/doc/development/connectivity-Guides/service-introduction-0000000000018585
Alternatively, I recommend integrating the Huawei Health kit into a phone app based on the use case you described. Health kit allows phone apps to access the health & fitness data collected by Huawei wearables.
To answer B.M's question:
That is correct, you do not have to change the watch for the phone app option. These are two distinctly different options that I have described. Developing a watch app is different from creating a phone app that integrates the Huawei Health Kit. Each one serves a different purpose, and based on your use case, I believe that the a phone app makes the most sense.
Watch App: Can be only be developed on specific Huawei Watch models.
Phone App: Works with all Huawei wearables when Huawei Health Kit is integrated.
Please note that Wear OS (Google) is not used on Huawei wearables and does not work with the Huawei Health Kit.