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Decoding bike power data

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I have seen how the sdk speed and cadence decode works on the android sdk demo but don't understand the way it decodes. The bytes used are not the same as the one in the profile message payload. Since I want to apply the same pattern for the srm power in my Android app. I have dilemma in using the LSB and MSB for the accumulated and instantaneous power which hold 2 bytes. Any help will be appreciated!

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There's no need to reverse engineer this information from code.
When you're a registered ANT+ adopter on http://www.thisisant.com (registration is free), you have access to the so-called ANT+ device profiles. These specify in detail how the payload of the device specific messages is structured.

Cheers,
OMB