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hnbgw: Submit proper L3 PDUs during CR

Generating random PDU values makes hnbgw ac ton it, since it looks up
higher layers to figure out NRI steering.

Change-Id: I725c35a3584b7d2d162c24ab2b662cfb80e539d7
Related: OS#6717
---
M hnbgw/ConnHdlr.ttcn
1 file changed, 11 insertions(+), 1 deletion(-)

git pull ssh://gerrit.osmocom.org:29418/osmo-ttcn3-hacks refs/changes/89/39489/1

diff --git a/hnbgw/ConnHdlr.ttcn b/hnbgw/ConnHdlr.ttcn
index 47c25a7..efba060 100644
--- a/hnbgw/ConnHdlr.ttcn
+++ b/hnbgw/ConnHdlr.ttcn
@@ -493,7 +493,17 @@
 	var octetstring nas;
 
 	if (pars.tx_sccp_cr_data_len == 0) {
-		nas := f_rnd_octstring(10);
+		var octetstring tmsi := f_gen_tmsi(suffix := 0);
+		var MobileIdentityLV mi_lv := valueof(ts_MI_IMSI_LV(pars.imsi));
+		if (pars.ps_domain) {
+			var PDU_L3_MS_SGSN l3_pdu;
+			l3_pdu := valueof(ts_GMM_ATTACH_REQ(mi_lv, f_RAI('001'H, '01'H, '2a2a'O, '17'O)));
+			nas := enc_PDU_L3_MS_SGSN(l3_pdu);
+		} else {
+			var PDU_ML3_MS_NW l3_pdu;
+			l3_pdu := valueof(ts_LU_REQ(LU_Type_IMSI_Attach, mi_lv, '00F110'O));
+			nas := enc_PDU_ML3_MS_NW(l3_pdu);
+		}
 	} else {
 		/* The test asks for an exact number of Optional Data bytes. */
 

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