luci-app-qmodem: add hang off support for mt5700

luci/luci-app-qmodem/root/usr/share/qmodem/modem_dial.sh

@@ -625,6 +625,8 @@ ecm_hang()
         fi
     elif [ "$manufacturer" = "meig" ]; then
         at_command="AT$QCRMCALL=0,1,1,2,1"
+    elif [ "$manufacturer" = "huawei" ]; then
+        at_command="AT^NDISDUP=0,0"
     else
         at_command='ATI'
     fi
@@ -789,7 +791,7 @@ at_dial()
         "huawei")
             case $platform in
                 "hisilicon")
-                    at_command="AT^SETAUTODIAL=1,1"
+                    at_command="AT^NDISDUP=1,1"
                     cgdcont_command="AT+CGDCONT=1,\"$pdp_type\""
                     ;;
             esac