OsmocomBB

I am trying to ping the MS from the BTS side, but seeing lots of errors and almost no Echo Rsp.

trxcon logs errors about GPRS UL BLOCK.req without prior TBF CFG.req:

20231005180900657 DSCH NOTICE trxcon(0)[0x5572f10900]: Reset scheduler  (sched_trx.c:190)
20231005180900657 DSCH NOTICE trxcon(0)[0x5572f10900]: Delete TDMA timeslot #0 (sched_trx.c:226)
20231005180900657 DSCH NOTICE trxcon(0)[0x5572f10900]: Add a new TDMA timeslot #3 (sched_trx.c:207)
20231005180900657 DSCH NOTICE trxcon(0)[0x5572f10900]: (Re)configure TDMA timeslot #3 as PDCH (sched_trx.c:276)
20231005180900657 DSCH NOTICE trxcon(0)[0x5572f10900]: TS3-PDTCH activating (sched_trx.c:476)
20231005180900657 DSCH NOTICE trxcon(0)[0x5572f10900]: TS3-PTCCH activating (sched_trx.c:476)
20231005180900843 DSCH NOTICE trxcon(0)[0x5572f10900]: Delete TDMA timeslot #3 (sched_trx.c:226)
20231005180900843 DGPRS ERROR trxcon(0)[0x5572f10900]: (PDCH-3) Rx UL BLOCK.req (fn=2003126, len=34), but this PDCH has no configured TBFs (l1gprs.c:643)
20231005180900871 DL1C NOTICE trxcon(0)[0x5572f10900]{PACKET_DATA}: Received reset request (FULL) (l1ctl.c:439)
20231005180900871 DSCH NOTICE trxcon(0)[0x5572f10900]: Reset scheduler and clock counter (sched_trx.c:190)
20231005180900872 DL1C NOTICE trxcon(0)[0x5572f10900]{RESET}: Received FBSB request (GSM900 979, timeout 100 TDMA FNs) (l1ctl.c:380)
20231005180900872 DSCH NOTICE trxcon(0)[0x5572f10900]: Add a new TDMA timeslot #0 (sched_trx.c:207)
20231005180900872 DSCH NOTICE trxcon(0)[0x5572f10900]: (Re)configure TDMA timeslot #0 as BCCH+CCCH+SDCCH/4+SACCH/4 (sched_trx.c:276)
20231005180900872 DSCH NOTICE trxcon(0)[0x5572f10900]: TS0-SCH activating (sched_trx.c:476)
20231005180900872 DSCH NOTICE trxcon(0)[0x5572f10900]: TS0-BCCH activating (sched_trx.c:476)
20231005180900872 DSCH NOTICE trxcon(0)[0x5572f10900]: TS0-RACH activating (sched_trx.c:476)
20231005180900872 DSCH NOTICE trxcon(0)[0x5572f10900]: TS0-CCCH activating (sched_trx.c:476)
20231005180900890 DAPP ERROR trxcon(0)[0x5572f10900]{FBSB_SEARCH}: Event TRXCON_EV_RX_DATA_IND not permitted (trxcon_shim.c:93)
20231005180901644 DL1C NOTICE trxcon(0)[0x5572f10900]{BCCH_CCCH}: Received 8-bit RACH request (offset=0, ra=0x78) (l1ctl.c:542)
20231005180901646 DSCHD NOTICE trxcon(0)[0x5572f10900]: TS0-RACH Scheduled 8-bit RACH (TS0: GSM, GMSK) at fn=2003300 (sched_lchan_rach.c:130)
20231005180901834 DL1C NOTICE trxcon(0)[0x5572f10900]{BCCH_CCCH}: Received L1CTL_DM_EST_REQ (tn=4, chan_nr=0xc4, tsc=7, tch_mode=SIGNALLING) (l1ctl.c:630)
20231005180901834 DL1C NOTICE trxcon(0)[0x5572f10900]{BCCH_CCCH}: L1CTL_DM_EST_REQ indicates single ARFCN GSM900 979 (l1ctl.c:572)
20231005180901834 DSCH NOTICE trxcon(0)[0x5572f10900]: Reset scheduler  (sched_trx.c:190)
20231005180901834 DSCH NOTICE trxcon(0)[0x5572f10900]: Delete TDMA timeslot #0 (sched_trx.c:226)
20231005180901834 DSCH NOTICE trxcon(0)[0x5572f10900]: Add a new TDMA timeslot #4 (sched_trx.c:207)
20231005180901834 DSCH NOTICE trxcon(0)[0x5572f10900]: (Re)configure TDMA timeslot #4 as PDCH (sched_trx.c:276)
20231005180901834 DSCH NOTICE trxcon(0)[0x5572f10900]: TS4-PDTCH activating (sched_trx.c:476)
20231005180901834 DSCH NOTICE trxcon(0)[0x5572f10900]: TS4-PTCCH activating (sched_trx.c:476)
20231005180902026 DSCH NOTICE trxcon(0)[0x5572f10900]: Delete TDMA timeslot #4 (sched_trx.c:226)
20231005180902026 DGPRS ERROR trxcon(0)[0x5572f10900]: (PDCH-4) Rx UL BLOCK.req (fn=2003382, len=34), but this PDCH has no configured TBFs (l1gprs.c:643)
20231005180902054 DL1C NOTICE trxcon(0)[0x5572f10900]{PACKET_DATA}: Received reset request (FULL) (l1ctl.c:439)
20231005180902054 DSCH NOTICE trxcon(0)[0x5572f10900]: Reset scheduler and clock counter (sched_trx.c:190)
20231005180902055 DL1C NOTICE trxcon(0)[0x5572f10900]{RESET}: Received FBSB request (GSM900 979, timeout 100 TDMA FNs) (l1ctl.c:380)
20231005180902055 DSCH NOTICE trxcon(0)[0x5572f10900]: Add a new TDMA timeslot #0 (sched_trx.c:207)
20231005180902055 DSCH NOTICE trxcon(0)[0x5572f10900]: (Re)configure TDMA timeslot #0 as BCCH+CCCH+SDCCH/4+SACCH/4 (sched_trx.c:276)
20231005180902055 DSCH NOTICE trxcon(0)[0x5572f10900]: TS0-SCH activating (sched_trx.c:476)
20231005180902055 DSCH NOTICE trxcon(0)[0x5572f10900]: TS0-BCCH activating (sched_trx.c:476)
20231005180902055 DSCH NOTICE trxcon(0)[0x5572f10900]: TS0-RACH activating (sched_trx.c:476)
20231005180902055 DSCH NOTICE trxcon(0)[0x5572f10900]: TS0-CCCH activating (sched_trx.c:476)
20231005180902511 DL1D NOTICE trxcon(0)[0x5572f10900]: L1CTL connection error: read() failed (rc=0): Resource temporarily unavailable (l1ctl_server.c:55)
20231005180902511 DL1C NOTICE trxcon(0)[0x5572f10900]: Closing L1CTL connection (l1ctl_server.c:203)
20231005180902511 DSCH NOTICE trxcon(0)[0x5572f10900]: Shutdown scheduler (sched_trx.c:173)
20231005180902511 DSCH NOTICE trxcon(0)[0x5572f10900]: Delete TDMA timeslot #0 (sched_trx.c:226)
<pre>

Please find the PCAPs (MS side + BTS side) attached.