edge: Support EGPRS in write_packet_downlink_assignment

Add an use_egprs parameter to write_packet_downlink_assignment
and add the EGPRS related fields if it is set to true. The
window size is fixed at 64 blocks, link quality measurement
reports have been disabled, and the other optional fields are not
present.

Sponsored-by: On-Waves ehf
3 files changed