[srslte-users] srsUE to not actually Attach (Creating a PDSCH Sniffer)

Dylanger Daly dylanger at thegrail.co
Mon Dec 10 12:07:04 UTC 2018


Hey Guys,

I'm trying to create a PDSCH sniffer with srsUE.

I'd like srsUE to follow the C-RNTI for any and all UEs connected, then
parse the data out to a pcap, I believe this should be possible with srsUE.

In an old thread (
http://www.softwareradiosystems.com/pipermail/srslte-users/2016-February/000156.html),
Paul recommends editing the `write_pdu_bcch_dlsch` function to replace the
send_con_request with rrc_connection_release.

However it looks like things have shifted a little since that thread, also,
would this _just_ give me Paging Messages? (0xFFFE), I'd much rather parse
everything I can, for example, RRC Messages for other devices.

Do I need to RACH? Because I'm not actually sending any data, I shouldn't
need to, right?

Any help would be appreciated, thank you!
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