c - Connecting to Bluetooth Device using bluetooth_client_connect_service() - gnome-bluetooth 3.8.2.1 -

i glad if can pointed in right direction community concerning above topic.

i interested in connecting bluetooth devices using gnome-bluetooth api in ubuntu 14.04 using bluetooth_client_connect_service() function.

i have tried searching not find results on how use decided read gnome-bluetooth's source code due insufficient commenting unable understand.

below have done far not errors when try running application yet when double-click on device nothing.

#define agent_path "/org/bluez/agent/wizard" #include <stdio.h> #include <errno.h> #include <ctype.h> #include <fcntl.h> #include <unistd.h> #include <stdlib.h> #include <string.h> #include <getopt.h> #include <sys/param.h> #include <sys/ioctl.h> #include <sys/socket.h> #include <signal.h> #include <math.h> #include <glib.h> //#include <dbus/dbus.h> #include <glib/gi18n.h> #include <gdk/gdkkeysyms.h> #include <gtk/gtk.h> #include <bluetooth-chooser.h> #include <bluetooth-client.h> #include <bluetooth-utils.h>  #include <bluetooth/bluetooth.h> #include <bluetooth/hci.h> #include <bluetooth/hci_lib.h>  #define connect_timeout 3.0 #define agent_path "/org/bluez/agent/wizard"  typedef struct {     char *path;     gtimer *timer; } connectdata;  bluetoothclient *client; gtkwidget *selector; gtkwidget *vboxmainlayout;  gvalue value = { 0, };  int find_conn(int s, int dev_id, long arg) {     struct hci_conn_list_req *cl;     struct hci_conn_info *ci;     int i;      if (!(cl = malloc(10 * sizeof(*ci) + sizeof(*cl)))) {         perror("can't allocate memory");         exit(1);     }     cl->dev_id = dev_id;     cl->conn_num = 10;     ci = cl->conn_info;      if (ioctl(s, hcigetconnlist, (void *) cl)) {         perror("can't connection list");         exit(1);     }      (i = 0; < cl->conn_num; i++, ci++)         if (!bacmp((bdaddr_t *) arg, &ci->bdaddr)) {             free(cl);             return 1;         }      free(cl);     return 0; }  void cmd_rssi(const char *bt_address) {     struct hci_conn_info_req *cr;     bdaddr_t bdaddr;     int8_t rssi;     int dd, dev_id;      str2ba(bt_address, &bdaddr);          dev_id = hci_for_each_dev(hci_up, find_conn, (long) &bdaddr);         if (dev_id < 0) {             g_print("\tnot connected.\n");             return;         }      dd = hci_open_dev(dev_id);     if (dd < 0) {         perror("hci device open failed");         exit(1);     }      cr = malloc(sizeof(*cr) + sizeof(struct hci_conn_info));     if (!cr) {         perror("can't allocate memory");         exit(1);     }      bacpy(&cr->bdaddr, &bdaddr);     cr->type = acl_link;     if (ioctl(dd, hcigetconninfo, (unsigned long) cr) < 0) {         perror("get connection info failed");         exit(1);     }      if (hci_read_rssi(dd, htobs(cr->conn_info->handle), &rssi, 1000) < 0) {         perror("read rssi failed");         exit(1);     }      g_print("\trssi return value: %d\n", rssi);      free(cr);      hci_close_dev(dd); }  void connect_callback (gobject *source_object, gasyncresult *res, gpointer user_data) {     connectdata *data = (connectdata *) user_data;     gboolean success;      success = bluetooth_client_connect_service_finish (client, res, null);      if (success == false && g_timer_elapsed (data->timer, null) < connect_timeout) {         bluetooth_client_connect_service (client, data->path, true, null, connect_callback, data);         return;     }      if (success == false)         g_print ("\tfailed connect device %s", data->path);     else         g_print("\n\tconnection successfully.. ha.. i'm tired\n");      g_timer_destroy (data->timer);     g_free (data->path);     g_free (data); }  void create_callback (bluetoothclient *_client, const char *path, const gerror *error, gpointer user_data) {     connectdata *data;     //compiler throws "implicit declaration" warning here     //bluetooth_client_set_trusted(client, path, true);      data = g_new0 (connectdata, 1);     data->path = g_strdup (path);     data->timer = g_timer_new ();      bluetooth_client_connect_service (client, path, true, null, connect_callback, data); }  void get_device_info(bluetoothchooser *self) {          const gchar* result;          g_print ("info dumped:\n");         if (bluetooth_chooser_get_selected_device_info (self, "name", &value)) {             g_print ("\tname: '%s'\n", g_value_get_string (&value));             g_value_unset (&value);         }         if (bluetooth_chooser_get_selected_device_info (self, "address", &value)) {             g_print ("\taddress: '%s'\n", g_value_get_string (&value));             g_value_unset (&value);         }         if (bluetooth_chooser_get_selected_device_info (self, "paired", &value)) {             result = g_value_get_boolean (&value)? "paired":"unpaired";             g_print ("\tpaired: '%s'\n", result);             g_value_unset (&value);         }         guint type = bluetooth_chooser_get_selected_device_type (self);         const gchar *device_type = bluetooth_type_to_string(type);         if(type)         {             g_print("\ttype: '%s'\n", device_type);         }         if (bluetooth_chooser_get_selected_device_info (self, "connected", &value)) {                 result = g_value_get_boolean (&value)? "connected":"not connected";                 g_print ("\tconnected: '%s'\n", result);                 g_value_unset (&value);         } }  /* problem lies here.. how connect detected device   * no error message displayed when device double-clicked  */ void connect_button_clicked(gtkwidget *widget, gpointer user_data) {     const char *path = agent_path;     connectdata *data = (connectdata *) user_data;     gvalue value = { 0, };      bluetooth_chooser_get_selected_device_info (widget, "address", &value);     bluetooth_client_connect_service (client, path, true, null, connect_callback, data);      //function rssi value of remote device     cmd_rssi(g_value_get_string (&value)); }  void create_interface(gtkapplication *app, gpointer user_data) {     gtkwidget *frmtopwindow;     frmtopwindow = gtk_application_window_new(app);     gtk_window_set_title(gtk_window(frmtopwindow), "test");     gtk_window_set_position(gtk_window(frmtopwindow),gtk_win_pos_center);     gtk_window_set_default_size(gtk_window(frmtopwindow),200,400);      selector = bluetooth_chooser_new();     g_object_set(selector,                   "show-searching", true,                   "show-device-type", false,                   "show-pairing" , true,                   "show-device-category", false,                      null);         client = bluetooth_client_new();         vboxmainlayout = gtk_box_new(gtk_orientation_vertical, 3);         g_object_set(vboxmainlayout,                 "width-request", 190,                 "height-request", 300, null);          gtk_container_add(gtk_container(frmtopwindow),selector);          /*events , signals*/         /*------------------*/          // when user double-clicks on detected device, try , connect device         // , display it's rssi         g_signal_connect(g_object(selector),"notify::selected-device-activated",g_callback(connect_button_clicked),client);          //when user clicks on detected device, display information device in         // standard output         g_signal_connect(g_object(selector),"notify::device-selected",g_callback(get_device_info),vboxmainlayout);          gtk_widget_show_all(frmtopwindow); }  int main(int argc, char** argv) {     gtkapplication *app;     int status;     app = gtk_application_new ("rucst.project.test", g_application_flags_none);     g_signal_connect (app, "activate", g_callback (create_interface), null);     status = g_application_run (g_application (app), argc, argv);     g_object_unref (app);     return status; } 

in implementation code, have g_signal_connect function calls shown below:

g_signal_connect(g_object(selector),"notify::selected-device-activated",g_callback(connect_button_clicked),client); 

this code expect connect selected detected device when receives double-click signal @ moment nothing happens when double-click on it.

i grateful receive guidance experts.

thank in advance

g_signal_connect(g_object(selector),"notify::selected-device-activated",                  g_callback(connect_button_clicked),client); 

this signal signature used if there property "selected-device-activated" , wanted know when property value changes. in case "selected-device-activated" actual signal should do:

g_signal_connect(g_object(selector),"selected-device-activated",                  g_callback(callback), client); 

the single click version happens work because you've found property want, connecting "notify::device-selected" works (i'd still connect "selected-device-changed" signal consistency instead).

---

after in connect_button_clicked() connect call uses seems unrelated path device object path... might work instead (although i'm not 100% sure "proxy" field name, i've not used api myself):

gvalue value = { 0, }; if (bluetooth_chooser_get_selected_device_info (bluetooth_chooser (widget),                                                 "proxy", &value)) {     gdbusproxy *proxy = g_value_get_object (&value);     g_print ("connecting %s\n", g_dbus_proxy_get_object_path(proxy));     bluetooth_client_connect_service (client, g_dbus_proxy_get_object_path(proxy),                                       true, null, connect_callback, data); } 

note userdata pointers give callbacks wrong: e.g. connect_button_clicked() expects connectdata* gets bluetoothclient*.