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Using a generic external HR strap?

I have an old TomTom external chest strap (Bluetooth Smart) and I'm trying to use it with a F235. Is it supposed to work or is the external sensor only for Garmins own chest strap? The chest strap is working because I can connect it to my phone just fine but when I search for it with my F235, it just says that no devices were detected...

Thanks in advance,
Nik