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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);
?>
English translation
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Document created the 30/01/2003, last modified the 26/10/2018
Source of the printed document:https://www.gaudry.be/en/php-rf-gupnp.binary-light.html
The infobrol is a personal site whose content is my sole responsibility. The text is available under CreativeCommons license (BY-NC-SA). More info on the terms of use and the author.
References
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The author This site is solely responsible for the way in which the various concepts, and the freedoms that are taken with the reference works, are presented here. Remember that you must cross multiple source information to reduce the risk of errors.
