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External Sensor data broadcasting

Hello everyone, I would like to make the following application.

I want to connect a temperature sensor to nRF51822-beacon to broadcast the temperature measurements

First, how would you approach such an app?

Second, my questions:

a) I know I need to convert the analog signals to digital, and there is an expample about that (simple_adc_pca10028). However, what I could not find is which variable capturing this data/ how to extract the converted data?

b) How to append this data to an advertising packet (which needs to be changed every advertisement)?

Thanks in advance.

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