ms: Add command line option and allow negative Tx/Rx offset

The +/- 3 frame offset for Tx/Rx is setup in the RadioInterface
constructor, so we need to know whether we are operating in MS or BTS
mode at the very beginning.

For MS mode, handle negative frame offsets, which would previously cause
an assertion error.

Signed-off-by: Thomas Tsou <tom@tsou.cc>
2 files changed