Channel Groups API for FreeRTOS SDK

Channel groups allow PubNub developers to bundle thousands of channels into a group that can be identified by a name. These channel groups can then be subscribed to, receiving data from the many back-end channels the channel group contains.

Channel group operations

You can't publish to a channel group. You can only subscribe to it. To publish within the channel group, you need to publish to each channel individually.

Add Channels

Requires Stream Controller add-on

This method requires that the Stream Controller add-on is enabled for your key in the Admin Portal. Read the support page on enabling add-on features on your keys.

This function adds a channel to a channel group.

Method(s)

Adding Channels is accomplished by using the following method(s) in the FreeRTOS SDK:

enum pubnub_res pubnub_add_channel_to_group (pubnub_t *p, char const *channel, char const *channel_group)

* required

Parameter	Description
p * Type: pubnub_t*	Pointer to PubNub client context.
channel * Type: char const*	The channel to add
channel_group * Type: char const*	The channel group to add to

Basic Usage

Add Channels

static char *channel_group = "family";

enum pubnub_res res;
res = pubnub_add_channel_to_group(pn, "wife", channel_group);
return check_response(pn, res);

Rest Response from Server

{
    "service" : "channel-registry",
    "status"  : 200,
    "error"   : false,
    "message" : "OK"
}

List Channels

Requires Stream Controller add-on

This method requires that the Stream Controller add-on is enabled for your key in the Admin Portal. Read the support page on enabling add-on features on your keys.

This function lists all the channels of the channel group.

Method(s)

Listing Channels is accomplished by using the following method(s) in the FreeRTOS SDK:

enum pubnub_res pubnub_list_channel_group (pubnub_t *p, char const *channel_group)

* required

Parameter	Description
p * Type: pubnub_t*	Pointer to PubNub client context.
channel_group * Type: char const*	The channel group to list channels from

Basic Usage

List Channels

static char *channel_group = "family";

pubnub_list_channel_group(ctx, channel_group);
pbresult = pubnub_await(ctx);
if (PNR_OK == pbresult) {
    char const *json_response = pubnub_get(ctx);
}

Rest Response from Server

{
    "status" : 200,
    "payload" : {
        "channels" : ["hi"],
        "group" : "abcd"
    },
    "service" : "channel-registry",
    "error" : False
}

Remove Channels

Requires Stream Controller add-on

This method requires that the Stream Controller add-on is enabled for your key in the Admin Portal. Read the support page on enabling add-on features on your keys.

This function removes the channels from the channel group.

Method(s)

Removing Channels is accomplished by using the following method(s) in the FreeRTOS SDK:

enum pubnub_res pubnub_remove_channel_from_group (pubnub_t *p, char const *channel, char const *channel_group)

* required

Parameter	Description
p * Type: pubnub_t*	Pointer to PubNub client context.
channel * Type: char const*	The channel to remove
channel_group * Type: char const*	The channel group to remove from

Basic Usage

Removing channels :

static char *channel_group = "family";

enum pubnub_res res;
res = pubnub_remove_channel_from_group(pn, "son", channel_group);
return check_response(pn, res);

Rest Response from Server

{
    "status" : 200,
    "message" : "OK",
    "service" : "channel-registry",
    "error" : False
}

Delete Channel Group

Requires Stream Controller add-on

This method requires that the Stream Controller add-on is enabled for your key in the Admin Portal. Read the support page on enabling add-on features on your keys.

This function removes the channel group.

Method(s)

Deleting Channel Group is accomplished by using the following method(s) in the FreeRTOS SDK:

enum pubnub_res pubnub_remove_channel_group (pubnub_t *p, char const *channel_group)

* required

Parameter	Description
p * Type: pubnub_t*	Pointer to PubNub client context.
channel_group * Type: char const*	The channel group to remove.

Basic Usage

Deleting Channel Group :

static char *channel_group = "family";

enum pubnub_res res;
res = pubnub_remove_channel_group(pn, channel_group);
return check_response(pn, res);

Rest Response from Server

{
    "status" : 200,
    "message" : "OK",
    "service" : "channel-registry",
    "error" : False
}