Channel Manager#

otChannelManagerRequestChannelChange#

void otChannelManagerRequestChannelChange (otInstance * aInstance, uint8_t aChannel)

Requests a Thread network channel change.

The network switches to the given channel after a specified delay (see otChannelManagerSetDelay()). The channel change is performed by updating the Pending Operational Dataset.

A subsequent call will cancel an ongoing previously requested channel change.

otChannelManagerGetRequestedChannel#

uint8_t otChannelManagerGetRequestedChannel (otInstance * aInstance)

This function gets the channel from the last successful call to otChannelManagerRequestChannelChange()

Returns

• The last requested channel or zero if there has been no channel change request yet.

otChannelManagerGetDelay#

uint16_t otChannelManagerGetDelay (otInstance * aInstance)

This function gets the delay (in seconds) used by Channel Manager for a channel change.

Returns

• The delay (in seconds) for channel change.

otChannelManagerSetDelay#

otError otChannelManagerSetDelay (otInstance * aInstance, uint16_t aDelay)

Sets the delay (in seconds) used for a channel change.

The delay should preferably be longer than the maximum data poll interval used by all sleepy-end-devices within the Thread network.

otChannelManagerRequestChannelSelect#

otError otChannelManagerRequestChannelSelect (otInstance * aInstance, bool aSkipQualityCheck)

This function requests that ChannelManager checks and selects a new channel and starts a channel change.

Unlike the otChannelManagerRequestChannelChange() where the channel must be given as a parameter, this function asks the ChannelManager to select a channel by itself (based on collected channel quality info).

Once called, the Channel Manager will perform the following 3 steps:

1) ChannelManager decides if the channel change would be helpful. This check can be skipped if aSkipQualityCheck is set to true (forcing a channel selection to happen and skipping the quality check). This step uses the collected link quality metrics on the device (such as CCA failure rate, frame and message error rates per neighbor, etc.) to determine if the current channel quality is at the level that justifies a channel change.

2) If the first step passes, then ChannelManager selects a potentially better channel. It uses the collected channel quality data by ChannelMonitor module. The supported and favored channels are used at this step. (see otChannelManagerSetSupportedChannels() and otChannelManagerSetFavoredChannels()).

3) If the newly selected channel is different from the current channel, ChannelManager requests/starts the channel change process (internally invoking a RequestChannelChange()).

otChannelManagerSetAutoChannelSelectionEnabled#

void otChannelManagerSetAutoChannelSelectionEnabled (otInstance * aInstance, bool aEnabled)

Enables or disables the auto-channel-selection functionality.

When enabled, ChannelManager will periodically invoke a RequestChannelSelect(false). The period interval can be set by SetAutoChannelSelectionInterval().

otChannelManagerGetAutoChannelSelectionEnabled#

bool otChannelManagerGetAutoChannelSelectionEnabled (otInstance * aInstance)

This function indicates whether the auto-channel-selection functionality is enabled or not.

Returns

• TRUE if enabled, FALSE if disabled.

otChannelManagerSetAutoChannelSelectionInterval#

otError otChannelManagerSetAutoChannelSelectionInterval (otInstance * aInstance, uint32_t aInterval)

Sets the period interval (in seconds) used by auto-channel-selection functionality.

otChannelManagerGetAutoChannelSelectionInterval#

uint32_t otChannelManagerGetAutoChannelSelectionInterval (otInstance * aInstance)

This function gets the period interval (in seconds) used by auto-channel-selection functionality.

Returns

• The interval in seconds.

otChannelManagerGetSupportedChannels#

uint32_t otChannelManagerGetSupportedChannels (otInstance * aInstance)

Gets the supported channel mask.

Returns

• The supported channels as a bit-mask.

otChannelManagerSetSupportedChannels#

void otChannelManagerSetSupportedChannels (otInstance * aInstance, uint32_t aChannelMask)

Sets the supported channel mask.

otChannelManagerGetFavoredChannels#

uint32_t otChannelManagerGetFavoredChannels (otInstance * aInstance)

Gets the favored channel mask.

Returns

• The favored channels as a bit-mask.

otChannelManagerSetFavoredChannels#

void otChannelManagerSetFavoredChannels (otInstance * aInstance, uint32_t aChannelMask)

Sets the favored channel mask.

otChannelManagerGetCcaFailureRateThreshold#

uint16_t otChannelManagerGetCcaFailureRateThreshold (otInstance * aInstance)

Gets the CCA failure rate threshold.

Returns

• The CCA failure rate threshold. Value 0 maps to 0% and 0xffff maps to 100%.

otChannelManagerSetCcaFailureRateThreshold#

void otChannelManagerSetCcaFailureRateThreshold (otInstance * aInstance, uint16_t aThreshold)

Sets the CCA failure rate threshold.