sysmobts: when a BTS is rf_locked and doesn't support BTS_FEAT_MULTI_TSC the OML connection is dropped
I need to validate and reproduce this issue.
- Use a osmo-bsc with a sysmobts 1020.
- Configure the bts on the bsc as `rf_locked 1`
- Configure a BSIC != 0
- Start/Power up the BTS 1020.
- The OML connection will be dropped by the BSC after the BTS answered invalid configuration.
The problem is the BSIC configuration. The sysmobts 1020 doesn't support BTS_FEAT_MULTI_TSC. The BSIC isn't set on the BTS MO (because of the rf_locked 1), but the TSC is set on the channel.
A fix would be always configuring the BSIC on BTS MO or delay the
TRX channel configuration.