diff --git a/reg-tests/converter/mqtt.vtc b/reg-tests/converter/mqtt.vtc
index ea2cbb4..9f7e6b1 100644
--- a/reg-tests/converter/mqtt.vtc
+++ b/reg-tests/converter/mqtt.vtc
@@ -42,6 +42,11 @@
     recv 22
     sendhex "21020000"
     expect_close
+
+    # MQTT 3.1 CONNECT packet (id: test_sub - username: test - passwd: passwd)
+    accept
+    recv 38
+    sendhex "20020000"
 } -start
 
 server s2 {
@@ -225,3 +230,9 @@
     recv 39
     expect_close
 } -run
+
+client c3_31_1 -connect ${h1_fe1_sock} {
+    # Valid MQTT 3.1 CONNECT packet (id: test_sub - username: test - passwd: passwd)
+    sendhex "102400064d514973647003c200000008746573745f7375620004746573740006706173737764"
+    recv 4
+} -run
\ No newline at end of file