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Mysterious marriage between Fenix 5 plus and an iBike ANT+ cadence sensor => Only those read it who love detective stories!

Hi,

I have three bikes, 2 of them full with ANT+ sensors. One of them, a recumbent, has been mounted with a cadence sensor produced under the brandname iBike.

All of my sensors worked always very well with any of my watches (310Xt, 910XT, another 910XT, Fenix 3HR) and any of my cycling gadgets (iBike Newton, Edge 705, Bryton 410, Powertap Joule GPS).

Yesterday I spotted that my relatively new Fenix 5 plus did not like one of the sensors, namely this cadence sensor. Earlier I had not spotted it, because my Powertap powermeter hub does broadcast not just watts, but cadence data , too.

What did this dislike mean? Fenix 5 plus could not connect to this cadense sensor.

I made a lot of test to localise the problem.

1. First I thought that it was a simple battery problem, but no, all of my other gadgets could connect to the cadence sensor even with the original 2032 coin battery. Anyway I swapped the battery just to be sure that I had a fully charged one.

2. Then I thought there was problem with my Fenix 5 plus, which for some any mysterious reason did not want to connect any cadence sensor. Therefore I tried to connect it to the other cadence sensor, which was on my road bike, and it could.

3. Then I thought maybe something had been stuck within Fenix 5 plus, therefore I removed this iBike cadence sensor from the sensor list of my F5+. After the removal I could easily pair it, but never could connect it.

4. Then I thought I had to restart my watch after the removal, and only after the restart I should re-pair it. I could re-pair it, but could not connect it.

5. Then I applied not a normal restart, but a long pressing reboot. The same result.

6. My new idea was that I could not connect to this cadence sensor, just because my F5+ had been programmed in a way that if it finds a powermeter which broadcasts cadence data then it cannnot connect to a dedicated cadence sensor. Therefore I removed the powermeter hub from the sensor list, both as an ANT+ sensor and as a blueutooth sensor.

Certainly I failed. Pairing was OK, connecting not.

7. My final thought was that I had to do a full reset of my watch, because the ANT+ ID of my cadence sensor had been corrupted somehow within my F5+. But instead of doing this cumbersome procedure of reset and start it from the scratch again, and in order to avoid the swearing afterwards that it would not help  I had the idea to make my cadence sensor a totally new sensor for my watch. I remembered that one could generate a new ID for some of the ANT+ sensors with the method to place the battery with the reversed sides in the sensor for a couple of seconds.

I did it, and voilá my cadence sensor got a new ANT+ ID. The byproduct of this step was that all of my other gadges, too, had to be taught that there was a new cadence sensor present.

But I failed. My bloody F5+ could pair with this pseudo new cadence sensor, but could not connect to it.

Any helping thought? What the heck is happening in this mysterious world?