Implementing the BinaryLight device
This is an example of UPnP device/service, implementing the BinaryLight device and SwitchPower services to emulate a light switch.
The user interface was purposely simplified in order to show basic concepts and methods.
Example #1 Implementing light server
<?php
/* SetTarget */
function set_target_cb($service, $action, $arg)
{
/* Get the new target value */
$target = gupnp_service_action_get($action, 'NewTargetValue', GUPNP_TYPE_BOOLEAN);
/* If the new target doesn't match the current status, change the status and
emit a notification that the status has changed. */
if ($target != $GLOBALS['status']) {
$GLOBALS['status'] = $target;
gupnp_service_notify($service, 'Status', GUPNP_TYPE_BOOLEAN, $GLOBALS['status']);
printf("The light is now %s.\n", $GLOBALS['status'] ? "on" : "off");
}
/* Return success to the client */
gupnp_service_action_return($action);
}
/* GetTarget */
function get_target_cb($service, $action, $arg)
{
gupnp_service_action_set($action, 'RetTargetValue', GUPNP_TYPE_BOOLEAN, $GLOBALS['status']);
gupnp_service_action_return($action);
}
/* GetStatus */
function get_status_cb($service, $action, $arg)
{
gupnp_service_action_set($action, 'ResultStatus', GUPNP_TYPE_BOOLEAN, $GLOBALS['status']);
gupnp_service_action_return($action);
}
/* By default the light is off */
$GLOBALS['status'] = false;
printf("The light is now %s.\n", $GLOBALS['status'] ? "on" : "off");
/* Create the UPnP context */
$context = gupnp_context_new();
if (!$context) {
printf("Error creating the GUPnP context\n");
exit(-1);
}
/* Host the directory that contains device and service description files */
gupnp_context_host_path($context, "./web", "");
/* Create root device */
$location = "/BinaryLight.xml";
$dev = gupnp_root_device_new($context, $location);
gupnp_root_device_set_available($dev, true);
/* Get the switch service from the root device */
$service_type = "urn:schemas-upnp-org:service:SwitchPower:1";
$service = gupnp_device_info_get_service($dev, $service_type);
if (!$service) {
die("Cannot get SwitchPower1 service\n");
}
/* Set callback for action GetStatus */
gupnp_device_action_callback_set($service, GUPNP_SIGNAL_ACTION_INVOKED, "GetStatus",
"get_status_cb", "action data, GetStatus");
/* Set callback for action GetTarget */
gupnp_device_action_callback_set($service, GUPNP_SIGNAL_ACTION_INVOKED, "GetTarget",
"get_target_cb", "action data, GetTarget");
/* Set callback for action SetTarget */
gupnp_device_action_callback_set($service, GUPNP_SIGNAL_ACTION_INVOKED, "SetTarget",
"set_target_cb", "action data, SetTarget");
/* Run the main loop */
gupnp_root_device_start($dev);
?>
Example #2 Implementing light client
<?php
function service_proxy_available_cb($proxy, $arg)
{
$mode = $arg['mode'];
printf("Set subscribed\n");
gupnp_service_proxy_set_subscribed($proxy, true);
/* Add notify if status will be changed */
if (!gupnp_service_proxy_add_notify($proxy, "Status",
GUPNP_TYPE_BOOLEAN, "status_changed_cb", NULL)) {
printf("Failed to add notify\n");
}
if ($mode == 'TOGGLE') {
/* We're toggling, so first fetch the current status */
$target = gupnp_service_proxy_action_get($proxy, 'GetStatus', 'ResultStatus', GUPNP_TYPE_BOOLEAN);
/* And then toggle it */
$target = ! $target;
} else {
/* Mode is a boolean, so the target is the mode thanks to our well chosen
enumeration values. */
$target = ($mode == 'ON') ? true : false;
}
/* Set the target */
if (!gupnp_service_proxy_action_set($proxy, 'SetTarget', 'NewTargetValue', $target, GUPNP_TYPE_BOOLEAN)) {
printf("Cannot set switch\n");
} else {
printf("Set switch to %s.\n", $target ? "on" : "off");
}
/* Stop browsing */
gupnp_control_point_browse_stop($arg['cp']);
}
function status_changed_cb($variable, $value, $arg)
{
printf("Status has been changed\n");
printf("\tvariable name: %s\n", $variable);
printf("\tvalue: %s\n", (int)$value);
printf("\n");
}
/* Check and parse command line arguments */
if (count($argv) != 2) {
printf("Usage: light-client.php [on|off|toggle]\n");
exit(-1);
}
if ($argv[1] == "on") {
$mode = 'ON';
} elseif ($argv[1] == "off") {
$mode = 'OFF';
} elseif ($argv[1] == "toggle") {
$mode = 'TOGGLE';
} else {
usage ();
exit(-1);
}
/* Create the UPnP context */
$context = gupnp_context_new();
if (!$context) {
printf("Error creating the GUPnP context\n");
exit(-1);
}
/* Create the control point, searching for SwitchPower services */
$cp = gupnp_control_point_new ($context,
"urn:schemas-upnp-org:service:SwitchPower:1");
/* Connect to the service-found callback */
$cb = "service_proxy_available_cb";
$arg = array('mode' => $mode, 'cp' => $cp);
gupnp_control_point_callback_set($cp, GUPNP_SIGNAL_SERVICE_PROXY_AVAILABLE, $cb, $arg);
/* Start for browsing */
gupnp_control_point_browse_start($cp);
?>