sms-part-3gpp: add flag for indicating PDU is transfer-route message

When the message is a transfer-route MT, there is no SMSC address to
parse out. This flag allows indicating when the PDU is one such message.

src/mm-broadband-modem-mbim.c

@@ -5470,6 +5470,7 @@ add_sms_part (MMBroadbandModemMbim *self,
                                                  pdu->pdu_data,
                                                  pdu->pdu_data_size,
                                                  self,
+                                                 FALSE,
                                                  &error);
     if (part) {
         mm_obj_dbg (self, "correctly parsed PDU (%d)", pdu->message_index);

src/mm-broadband-modem-qmi.c

@@ -5796,6 +5796,7 @@ add_new_read_sms_part (MMIfaceModemMessaging *self,
                        guint32 index,
                        QmiWmsMessageTagType tag,
                        QmiWmsMessageFormat format,
+                       gboolean transfer_route,
                        GArray *data)
 {
     MMSmsPart *part = NULL;
@@ -5816,6 +5817,7 @@ add_new_read_sms_part (MMIfaceModemMessaging *self,
                                                      (guint8 *)data->data,
                                                      data->len,
                                                      self,
+                                                     transfer_route,
                                                      &error);
         break;
     case QMI_WMS_MESSAGE_FORMAT_MWI:
@@ -5882,6 +5884,7 @@ wms_raw_read_ready (QmiClientWms *client,
                                message->memory_index,
                                tag,
                                format,
+                               FALSE,
                                data);
     }
 
@@ -6232,6 +6235,7 @@ wms_indication_raw_read_ready (QmiClientWms *client,
                                ctx->memory_index,
                                tag,
                                format,
+                               FALSE,
                                data);
     }
 
@@ -6319,6 +6323,7 @@ messaging_event_report_indication_cb (QmiClientNas *client,
                                memory_index,
                                tag,
                                msg_format,
+                               TRUE,
                                raw_data);
 	return;
     }

src/mm-sms-part-3gpp.c

@@ -355,7 +355,7 @@ mm_sms_part_3gpp_new_from_pdu (guint         index,
         return NULL;
     }
 
-    return mm_sms_part_3gpp_new_from_binary_pdu (index, pdu, pdu_len, log_object, error);
+    return mm_sms_part_3gpp_new_from_binary_pdu (index, pdu, pdu_len, log_object, FALSE, error);
 }
 
 MMSmsPart *
@@ -363,6 +363,7 @@ mm_sms_part_3gpp_new_from_binary_pdu (guint         index,
                                       const guint8  *pdu,
                                       gsize          pdu_len,
                                       gpointer       log_object,
+                                      gboolean       transfer_route,
                                       GError       **error)
 {
     MMSmsPart *sms_part;
@@ -404,6 +405,7 @@ mm_sms_part_3gpp_new_from_binary_pdu (guint         index,
 
     offset = 0;
 
+    if (!transfer_route) {
         /* ---------------------------------------------------------------------- */
         /* SMSC, in address format, precedes the TPDU
          * First byte represents the number of BYTES for the address value */
@@ -423,6 +425,8 @@ mm_sms_part_3gpp_new_from_binary_pdu (guint         index,
              offset += smsc_addr_size_bytes;
         } else
               mm_obj_dbg (log_object, "  no SMSC address given");
+    } else
+        mm_obj_dbg (log_object, "  This is a transfer-route message");
 
 
     /* ---------------------------------------------------------------------- */

src/mm-sms-part-3gpp.h

@@ -30,6 +30,7 @@ MMSmsPart *mm_sms_part_3gpp_new_from_binary_pdu (guint          index,
                                                  const guint8  *pdu,
                                                  gsize          pdu_len,
                                                  gpointer       log_object,
+                                                 gboolean	transfer_route,
                                                  GError       **error);
 guint8    *mm_sms_part_3gpp_get_submit_pdu      (MMSmsPart     *part,
                                                  guint         *out_pdulen,