[Huawei Watch 2] grimloktt:
I was searching for this solution for some time, which was buried in a 13 page thread on the subject. Taken from this page (https://www.reddit.com/r/hwatch/com...ooth_headset_profile/?st=j6ocsof4&sh=983466ba), this has worked 100% of the time for me. It only took about 5 minutes to program in my bed--without having any previous knowledge of Automagic. I was initially deterred because of its reference to Tasker but I did find it easier than Tasker--which I still don't use or really like. Here is a copy/paste from the thread w/ a few tweaks that had me confused.

Since we got the Marshmallow update, I've had the issue where if I'm connected to my cars bluetooth speaker when I make a call or it comes in, would go to my watch. Workaround was having to remove the call audio from the watch and then switch it back on, pretty annoying. I tried using Tasker as a previous person made a post about it but couldn't get it working. Using Automagic, I got it working!

This is basically like Tasker but easier to use and not to mention I couldn't get Tasker working. The app costs $3.90 https://play.google.com/store/apps/details?id=ch.gridvision.ppam.androidautomagic&hl=en

You can download a free trial via their website http://automagic4android.com/en/evaluation

I got it working with 2 flows (Flow = profile). If you install the free trial, you can only use 3 flows at a time so when I installed the trial I deleted all the flows it came with. Basically what this does is whenever I connect to my car's BT it will disconnect the headset profile from my Huawei Watch and connect to my car BT headset profile. So when I make or receive a call, it'll go to my cars BT and not my watch. The watch still remains connected but just not the headset portion. When I disconnect from my cars BT connection it will reconnect the headset profile to my watch.

Create a new flow. I named it "Car BT connection".

Add a new trigger and choose "Bluetooth Device Connected"

-- To do this, click on the menu button, select new flow, click on the box, select the five lines, click on blue new at bottom, then select bluetooth device connected.

Click on specific device and choose your BT headset (In my case, I chose my cars BT)

-- After clicking on specific device, click on the three dots to the right of the space under bluetooth device addreses. If, like me, you may have two Ford Syncs listed (two Ford vehicles), you can figure out which is which by going to your phone's settings --> bluetooth --> gear icon --> delete the name of the device and select OK. This will then show the MAC address of that device. To figure out which one is which, do this while connected to vehicle and choose the one that says connected.

Click save

Click the plus icon and choose action

Select new and choose "Connect/Disconnect Bluetooth Device"

Bluetooth profile should be set to "Headset"

Bluetooth Device Address: Select your Huawei Watch

Choose "Disconnect" under Connect or Disconnect

Click Save

Click the plus icon and choose action

Select new and choose "Connect/Disconnect Bluetooth Device"

Bluetooth profile should be set to "Headset"

Bluetooth Device Address is your BT headset device (I chose my car)

Choose "Connect" under Connect or Disconnect

Click Save

Should look like this: https://drive.google.com/open?id=0B1J8Oay2yaZwb05WNzE2cVBRa1k

Click back arrow and create a new flow. I named mines "Car BT Disconnect"

Add a new trigger and choose "Bluetooth Device Disconnected"

Click on specific device and choose your BT headset (In my case, I chose my cars BT)

Click save

Click the plus icon and choose action

Select new and choose "Connect/Disconnect Bluetooth Device"

Bluetooth profile should be set to "Headset"

Bluetooth Device Address: Select your Huawei Watch

Choose "Connect" under Connect or Disconnect

Click Save

If you get a message stating something about if you want to reuse select yes and only for that location

Should look like this: https://drive.google.com/open?id=0B1J8Oay2yaZwWDUwN0dOS29KRm8

If you have any questions let me know.