[srsran-users] Modifying srsue to send my own RRC messages

[Karim Baccar]

Hello, 

My setup is composed of an USRP B210 and an Amarisoft callbox configured in SA mode. I have been trying to modify srsue library in order to send my own RRC packets I have created in the UPER format. My main problem is that I have not been able to forward none of the messages as I was getting a segmentation fault error message (Note that using the write_pdu function in rrc_nr wouldnt give me a problem but the messages were not forwarded to the sdr but were considered instead to be DL-DCCH). Any help in debugging the error would be greatly apperciated. 

/srsue/src/stack/rrc_nr/rrc_nr.cc: 
void rrc_nr::send_ul_dcch_bytes(size_t size, uint8_t *msg) 
{ 

srslog::basic_logger& logger = srslog::fetch_basic_logger("RRC-NR"); 
logger.set_level(srslog::basic_levels::debug); 
logger.set_hex_dump_max_size(-1); 

memcpy(pdu->msg, msg, size); 
pdu->N_bytes = size; 

if (pdu == nullptr) { 
logger.error("Couldn't allocate PDU in %s().", __FUNCTION__); 
return; 
} 

uint32_t lcid = 1; 
printf("sending...."); 
pdcp->write_sdu(lcid, std::move(pdu)); 
} 

--- command='srsue ue_offline.conf' version=22.04.0 signal=11 date='23/08/2022 08:27:20' --- 
srsue(+0x330e1f) [0x5573677f9e1f] 
/lib/x86_64-linux-gnu/libc.so.6(+0x43090) [0x7f797b996090] 
srsue(+0x2cf172) [0x557367798172] 
srsue(+0xab8c3) [0x5573675748c3] 
srsue(+0x91f2f) [0x55736755af2f] 
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf3) [0x7f797b977083] 
srsue(+0x94b7e) [0x55736755db7e] 
srsRAN crashed. Please send this backtrace to the developers ... 
--- exiting --- 
terminate called without an active exception 
--- command='srsue ue_offline.conf' version=22.04.0 signal=6 date='23/08/2022 08:27:20' --- 
srsue(+0x330e1f) [0x5573677f9e1f] 
/lib/x86_64-linux-gnu/libc.so.6(+0x43090) [0x7f797b996090] 
/lib/x86_64-linux-gnu/libc.so.6(gsignal+0xcb) [0x7f797b99600b] 
/lib/x86_64-linux-gnu/libc.so.6(abort+0x12b) [0x7f797b975859] 
/lib/x86_64-linux-gnu/libstdc++.so.6(+0x9e911) [0x7f797bd4f911] 
/lib/x86_64-linux-gnu/libstdc++.so.6(+0xaa38c) [0x7f797bd5b38c] 
/lib/x86_64-linux-gnu/libstdc++.so.6(+0xaa3f7) [0x7f797bd5b3f7] 
/usr/local/lib/libsrsran_rf_uhd.so(+0x15f38) [0x7f797b81bf38] 
/usr/local/lib/libsrsran_rf_uhd.so(+0x2b352) [0x7f797b831352] 
/lib/x86_64-linux-gnu/libc.so.6(__cxa_finalize+0xce) [0x7f797b999fde] 
/usr/local/lib/libsrsran_rf_uhd.so(+0xe117) [0x7f797b814117] 
srsRAN crashed. Please send this backtrace to the developers ... 
--- exiting --- 
--- command='srsue ue_offline.conf' version=22.04.0 signal=11 date='23/08/2022 08:27:20' --- 
srsue(+0x330e1f) [0x5573677f9e1f] 
/lib/x86_64-linux-gnu/libc.so.6(+0x43090) [0x7f797b996090] 
srsue(+0x1861c5) [0x55736764f1c5] 
srsue(+0x12a072) [0x5573675f3072] 
srsue(+0x1280d2) [0x5573675f10d2] 
srsue(+0x971bd) [0x5573675601bd] 
/lib/x86_64-linux-gnu/libpthread.so.0(+0x8609) [0x7f797c1cf609] 
/lib/x86_64-linux-gnu/libc.so.6(clone+0x43) [0x7f797ba72133] 
srsRAN crashed. Please send this backtrace to the developers ... 
--- exiting --- 
Segmentation fault 

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