LTE End to End Testing

[Justin-Garey]

Using the latest release (23.11), I have been trying to run the end to end tests. I started by enabling them through cmake so they would run with make test. I soon learned that I needed to use sudo to run them due to the netns being created. They still weren't passing so I started attempting with the run_lte.sh script in the test directory. That told me I needed screen to be installed. After that, the tests are able to fully run.

The tests are still reported as failing due to the UE not properly being shut down. For example, when running sudo ./run_lte.sh ~/Repos/srsRAN_4G/build/ 100, I receive:

Using 1 component carrier(s) in srsENB
Deleting existing log files for 100 PRB.
Starting srsEPC
srsEPC's PID is 7171
Starting srsENB
srsENB's PID is 7246
Starting srsUE
srsUE's PID is 7268
Waiting for tun_srsue to become available for 20s ..
tun_srsue is up with IP 172.16.0.2!
MME IP is 172.16.0.1
Run UL ping
Run DL ping
Run DL iperf
Shutting down LTE network
Error. srsUE didn't seem to have exited properly.

Looking into what the script is doing, it is checking that the log reports --- exiting --- on the last line of the log file. Instead the log file ends with:

2024-10-04T17:52:47.322608 [MAC    ] [I] [ 3742] BSR:   triggered_bsr_type=none, LCID QUEUE status: 0: 0 1: 0 2: 0 3: 0 
2024-10-04T17:52:47.341697 [RRC    ] [I] MEAS:  New measurement serving cell: earfcn=0, pci=1, rsrp=65.71 dBm, cfo=-0.0 Hz
2024-10-04T17:52:47.362870 [RRC    ] [I] MEAS:  New measurement serving cell: earfcn=0, pci=1, rsrp=65.71 dBm, cfo=-0.0 Hz
2024-10-04T17:52:47.384133 [RRC    ] [I] MEAS:  New measurement serving cell: earfcn=0, pci=1, rsrp=65.71 dBm, cfo=-0.0 Hz
2024-10-04T17:52:47.405283 [RRC    ] [I] MEAS:  New measurement serving cell: earfcn=0, pci=1, rsrp=65.71 dBm, cfo=-0.0 Hz
2024-10-04T17:52:47.426537 [RRC    ] [I] MEAS:  New measurement serving cell: earfcn=0, pci=1, rsrp=65.71 dBm, cfo=-0.0 Hz
2024-10-04T17:52:47.447676 [RRC    ] [I] MEAS:  New measurement serving cell: earfcn=0, pci=1, rsrp=65.71 dBm, cfo=-0.0 Hz
2024-10-04T17:52:47.456492 [NAS    ] [I] Saved GUTI to file m_tmsi: 1d54fa41, mcc: 1, mnc: 1, mme_group_id: 1, mme_code: 1a
2024-10-04T17:52:47.456496 [NAS    ] [I] Saved security ctxt to file .ctxt. ksi: 0, k_asme: d91700788a937b2699220fb6d05fdf4ceed81b62ca514bb550225c8687e61da9, tx_count: 3, rx_count: 3, int_alg: 1, enc_alg: 0

Adding more time for the shutdown to occur does not seem to help. Is there something going wrong here? Is the UE not shutting down properly something that I should ignore?