erGW error with gtplib 2.0.0

[gantonie]

Hi,

I have the following error since I updated gtplib to 2.0.0. This happens when I try to connect a physical UE to the eNodeB. It tries to connect then fails, returning this error.

2021-03-23T15:46:56.266560+01:00 <0.1120.0> error: crasher: initial call: ergw_context:'-port_message/2-fun-0-'/0, pid: <0.1120.0>, registered_name: [], error: {undef,[{ppp_frame,decode,[<<128,33,1,1,0,16,129,6,0,0,0,0,131,6,0,0,0,0>>],[]},{gtp_packet,decode_protocol_opts,3,[{file,"/home/epc/ergw/_build/default/lib/gtplib/src/gtp_packet.erl"},{line,402}]},{gtp_packet,decode_protocol_config_opts,1,[{file,"/home/epc/ergw/_build/default/lib/gtplib/src/gtp_packet.erl"},{line,396}]},{gtp_packet,decode_v2_element,3,[{file,"/home/epc/ergw/_build/default/lib/gtplib/src/gtp_packet.erl"},{line,3324}]},{gtp_packet,decode_v2,2,[{file,"/home/epc/ergw/_build/default/lib/gtplib/src/gtp_packet.erl"},{line,559}]},{gtp_packet,decode_ies,2,[{file,"/home/epc/ergw/_build/default/lib/gtplib/src/gtp_packet.erl"},{line,60}]},{ergw_context,port_message_run,2,[{file,"/home/epc/ergw/src/ergw_context.erl"},{line,100}]},{ergw_context,port_message_h,2,[{file,"/home/epc/ergw/src/ergw_context.erl"},{line,85}]}]}, ancestors: [<0.1001.0>,ergw_socket_sup,ergw_sup,<0.982.0>], message_queue_len: 0, messages: [], links: [], dictionary: [], trap_exit: false, status: running, heap_size: 1598, stack_size: 28, reductions: 586; neighbours:

In my configuration, all the components except the eNodeB are placed in a virtual machine.
I use srsLTE for the eNodeB, the MME and HSS from Open5GS and erGW + UPG-VPP for the control and user planes.

I didn't have this problem with gtplib 1.3.0 and I still don't have this problem if I use an emulated UE with srsue.

[vkatsuba]

Hi,

Looks like this is not a gtplib issue, I suppose this is issue in incorrect building of erGW after update lib inside of erGW. Try clean erGW and try again.

Regards,
--V

[RoadRunnr]

commit db599b0 broke that. It removed the ppp dependency, it should have replaced it with ppplib.

@vkatsuba can you please prepare a change and add ppplib to src/gtplib.app.src.