get Device Certificates
Retrieves the Poly manufacturer installed device certificate on the com.poly.polyos.room.DeviceTypePRIMARY.
This can be targeted to CONTROLLER, if called on an instance returned by targetLocal.
Return
PEM-encoded certificate, or bundle of certificates if includeCAChain is true.
Parameters
include CAChain
specifies whether or not to include the issuing certificate authority certificates in the return.