What is the Proof of Possession (PoP) code in provisioning? What types are available and how are they configured?

There are four PoP code types:

Type	Description
POP_TYPE_MAC	Derived from the last 8 digits of the device base MAC address. For example, if the MAC is C049EFBD42E4, the PoP value is EFBD42E4.
POP_TYPE_RANDOM	Derived from the first 8 characters of the random field in the device certificate.
POP_TYPE_CUSTOM	Set by calling app_network_set_custom_pop.
POP_TYPE_NONE	No PoP required.

Pass the desired PoP type as the parameter when calling app_network_start.