Ant+ signal retrasmission with variation

Hello,

i need an ant+ developer that basically from a set of ant+ signal values (for example a bike trainer send in ant+ live value cadence, heart rate and instant power), can take the data and retransmit changing values.

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For example if i have an ant+ signal Istant power received for bike trainer: 200w i want customize a % variation (negative or positive), so if i set 5% i have to retrasmit as signal 200*5/(100)= 210watts at computer.

Feel free to ask more in case.