Apps normally just receive ant/bt data. The Zwift Companion app is an exception as it can pickup data from a sensor and share it with the main Zwift app, but this is through internet rather than it re-transmitting.
Looks like the same applies to Wattbike
https://support.wattbike.com/hc/en-gb/articles/360006052040-How-to-connect-to-Zwift-
@hippy started
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Apps normally just receive ant/bt data. The Zwift Companion app is an exception as it can pickup data from a sensor and share it with the main Zwift app, but this is through internet rather than it re-transmitting.
Looks like the same applies to Wattbike
https://support.wattbike.com/hc/en-gb/articles/360006052040-How-to-connect-to-Zwift-