changing the class of the device without re-join

[NicolaC]

Hi
is possible to change the class of the device without to re-join?
I mean:

1. fw start in class C, the end node join to the network and waits for a message from the gway-network server
2. once message is received the device change its class (class A) and go to sleep waiting for interrupt (timer or accelerometer)
   3)once it wakes up it sends GNSS position (I have pytrack board)
   4)end node receive the confimration of the delivery message from the gateway-network server and return to sleep again.

Please help,
thanks
Nico