tree ec6efd8beef466ee547e8fabe07b60e7a0355bcb
parent 610517c8bd5f9e87729acdb4529c0870b0b5dced
author Andreas Eversberg <jolly@eversberg.eu> 1371021927 +0200
committer Harald Welte <laforge@gnumonks.org> 1373146575 +0200

LAPDm: Fix re-establishment of datalink

If the datalink fails or if handover or assignment to a new channel fails,
it is re-establised by sending SABM again. The length of establish message
is 0 in this case. The length is used to differentiate between
re-establishment and contention resolution, which has to be handled
differently.

See TS 04.06 Chapter 5.4.2.1