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@AkosLukacs Thanks for the reply! It seems I am on the right lines then - however
'I have to disconnect from the device for the service advertisements to actually update'
Maybe there is something wrong in my fundamental understanding - I have saved the watch app into the device storage, I run the app on the watch with no devices connected, then attempt to connect to the watch. By disconnect do you mean completely unpair and then repair? I'll give that a try!
I'll definitely take your advice and get that app, it sounds like it could be really useful.
You have to disconnect from the device for service advertisements to actually update.
Just tested your above snippet, and the new service shows up in nRF Connect, and does have a value of "Hello".
Get nRF Connect for your phone, makes quick checks really easy.