more SMS improvements

* describe data structures in gsm_04_11.h
* increae LCHAN RELEASE TIMEOUT for case of long SMS
* convert header field in sql table from NUMERIC to BLOB
* initial handling for validity period
* send RP ERROR messages with meaningful RP CAUSE in case of error
5 files changed
tree: b83e04b679cc601217aadeaed2f7e9859da3bcfe
  1. linux-kernel/
  2. openbsc/
  3. wireshark/