Channel Groups API for PubNub FreeRTOS SDK

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

Learn more about our Channel Groups here.

Channel Group operations

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

Adding Channels

Requires Stream Controller add-on Requires that the Stream Controller add-on is enabled for your key. See this page on enabling add-on features on your keys:
https://support.pubnub.com/hc/en-us/articles/360051974791-How-do-I-enable-add-on-features-for-my-keys-

Description

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:

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

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

Basic Usage

Adding 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"
}

Listing Channels

Requires Stream Controller add-on Requires that the Stream Controller add-on is enabled for your key. See this page on enabling add-on features on your keys:
https://support.pubnub.com/hc/en-us/articles/360051974791-How-do-I-enable-add-on-features-for-my-keys-

Description

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:

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

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

Basic Usage

Listing 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
}

Removing Channels

Requires Stream Controller add-on Requires that the Stream Controller add-on is enabled for your key. See this page on enabling add-on features on your keys:
https://support.pubnub.com/hc/en-us/articles/360051974791-How-do-I-enable-add-on-features-for-my-keys-

Description

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:

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

   Parameter	Type	Required	Description
   p	pubnub_t*	Yes	Pointer to PubNub client context.
   channel	char const*	Yes	The channel to remove
   channel_group	char const*	Yes	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
}

Deleting Channel Group

Requires Stream Controller add-on Requires that the Stream Controller add-on is enabled for your key. See this page on enabling add-on features on your keys:
https://support.pubnub.com/hc/en-us/articles/360051974791-How-do-I-enable-add-on-features-for-my-keys-

Description

This function removes the channel group.

Method(s)

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

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

   Parameter	Type	Required	Description
   p	pubnub_t*	Yes	Pointer to PubNub client context.
   channel_group	char const*	Yes	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
}