I'm using kamailio 5.8 and playing with the ims_diameter_server module, by sending an async diameter request and trying to catch the reponse.

Following the documentation, I'm sending the request with:

route[SEND_ACR]

{

      route(PREPARE_ACR);

      diameter_request_async("3", "271", "$var(json_acr)");

}

route[PREPARE_ACR]

{

      # here I build the AVP list in JSON

      $var(json_acr) = "[{"avpCode":277,"vendorId":0,"Flags":64,"int32":0},{...},{...}]";

}

event_route[diameter:response] {

      xlog("Reply to diameter request is: '$diameter_response'\n");

}

The ACR request is successfully sent and the the server is replying with ACA.

The list of AVP are properly parsed, but when I enter the event_route to print the response, I get the $diameter_response = 'null':

2024-12-11T10:52:39.192951872+00:00 stderr F 11(19) DEBUG: cdp [worker.c:374]: worker_process(): worker_process(): [2] got task Q(2/2)
2024-12-11T10:52:39.193026280+00:00 stderr F 11(19) DEBUG: ims_diameter_server [avp_helper.c:60]: avp2json(): AVP((nil) < 0x7ff827633810 >0x7ff8276338c0);code=263,flags=40;
2024-12-11T10:52:39.193026280+00:00 stderr F DataType=1;VendorID=0;DataLen=52;
2024-12-11T10:52:39.193026280+00:00 stderr F 11(19) DEBUG: ims_diameter_server [avp_helper.c:60]: avp2json(): AVP(0x7ff827633810 < 0x7ff8276338c0 >0x7ff827633970);code=268,flags=40;
2024-12-11T10:52:39.193026280+00:00 stderr F DataType=3;VendorID=0;DataLen=4;
2024-12-11T10:52:39.193026280+00:00 stderr F 11(19) DEBUG: ims_diameter_server [avp_helper.c:60]: avp2json(): AVP(0x7ff8276338c0 < 0x7ff827633970 >0x7ff827633a20);code=264,flags=40;
2024-12-11T10:52:39.193026280+00:00 stderr F DataType=1;VendorID=0;DataLen=37;
2024-12-11T10:52:39.193026280+00:00 stderr F 11(19) DEBUG: ims_diameter_server [avp_helper.c:60]: avp2json(): AVP(0x7ff827633970 < 0x7ff827633a20 >0x7ff8276340b0);code=296,flags=40;
2024-12-11T10:52:39.193026280+00:00 stderr F DataType=1;VendorID=0;DataLen=33;
2024-12-11T10:52:39.193124627+00:00 stderr F 11(19) DEBUG: ims_diameter_server [avp_helper.c:60]: avp2json(): AVP(0x7ff827633a20 < 0x7ff8276340b0 >0x7ff827634160);code=259,flags=40;
2024-12-11T10:52:39.193124627+00:00 stderr F DataType=0;VendorID=0;DataLen=4;
2024-12-11T10:52:39.193286132+00:00 stderr F 11(19) DEBUG: ims_diameter_server [avp_helper.c:60]: avp2json(): AVP(0x7ff8276340b0 < 0x7ff827634160 >0x7ff827634210);code=480,flags=40;
2024-12-11T10:52:39.193286132+00:00 stderr F DataType=0;VendorID=0;DataLen=4;
2024-12-11T10:52:39.193286132+00:00 stderr F 11(19) DEBUG: ims_diameter_server [avp_helper.c:60]: avp2json(): AVP(0x7ff827634160 < 0x7ff827634210 >0x7ff8276342c0);code=485,flags=40;
2024-12-11T10:52:39.193286132+00:00 stderr F DataType=0;VendorID=0;DataLen=4;
2024-12-11T10:52:39.193286132+00:00 stderr F 11(19) DEBUG: ims_diameter_server [avp_helper.c:60]: avp2json(): AVP(0x7ff827634210 < 0x7ff8276342c0 >(nil));code=85,flags=40;
2024-12-11T10:52:39.193286132+00:00 stderr F DataType=0;VendorID=0;DataLen=4;
2024-12-11T10:52:39.193612877+00:00 stderr F 11(19) INFO: <script>: [event_route]: Reply to diameter request is: '<null>'

Is there something I miss to set/configure?

Thanks,

Daniel