After waiting for way to long for Wahoo to support sending all notifications to your Wahoo cycle computer I decided to try and role my own solution. The biggest issue I faced was not reading notifications from the system but reverse engineering the Bluetooth stack. If Wahoo wanted to add this to their official app it would be trivial Google has good documentation on how to do so and there is good example code around on the internet.
After further investigation it's been found that both the offical wahoo app and Wahoo-Sender app can run at the same time. However you will first need to connect to your Wahoo from Wahoo-Sender. Once this has been done you can launch the offical wahoo app. If you do the above any text messages you get will be doubled up(Turning off messages in the offical wahoo app also stops messages from Wahoo-Sender being shown)
There are likely to be bugs or issues. Happy to accept issues and pull requests if you do have any issues.
You will need to install the application via the APK in releases(https://github.com/geocom/Wahoo-Sender/releases) or by building the code from source.
You will also need to turn off battery optimisation in order for the app to continue running in the background while you ride.
Please implement this into the official app. It is something that is desperately needed(Google it). I don't get SMS'es I get messages via web services(Signal, Facebook Messenger etc) just get it done it’s trivial