Link

This module includes functions that control link-layer configuration.

Summary

Enumerations
otMacFilterAddressMode{   OT_MAC_FILTER_ADDRESS_MODE_DISABLED,   OT_MAC_FILTER_ADDRESS_MODE_ALLOWLIST,   OT_MAC_FILTER_ADDRESS_MODE_DENYLIST }	enum Defines address mode of the mac filter.

Typedefs
otActiveScanResult	typedef struct otActiveScanResult Represents a received IEEE 802.15.4 Beacon.
otEnergyScanResult	typedef struct otEnergyScanResult Represents an energy scan result.
otHandleActiveScanResult)(otActiveScanResult *aResult, void *aContext)	typedef void(* Pointer is called during an IEEE 802.15.4 Active Scan when an IEEE 802.15.4 Beacon is received or the scan completes.
otHandleEnergyScanResult)(otEnergyScanResult *aResult, void *aContext)	typedef void(* Pointer is called during an IEEE 802.15.4 Energy Scan when the result for a channel is ready or the scan completes.
otLinkPcapCallback)(const otRadioFrame *aFrame, bool aIsTx, void *aContext)	typedef void(* Pointer is called when an IEEE 802.15.4 frame is received.
otMacCounters	typedef struct otMacCounters Represents the MAC layer counters.
otMacFilterAddressMode	typedef enum otMacFilterAddressMode Defines address mode of the mac filter.
otMacFilterEntry	typedef struct otMacFilterEntry Represents a Mac Filter entry.
otMacFilterIterator	typedef uint8_t Used to iterate through mac filter entries.
otThreadLinkInfo	typedef struct otThreadLinkInfo Represents link-specific information for messages received from the Thread radio.

Functions
otLinkActiveScan(otInstance *aInstance, uint32_t aScanChannels, uint16_t aScanDuration, otHandleActiveScanResult aCallback, void *aCallbackContext)	otError Starts an IEEE 802.15.4 Active Scan.
otLinkConvertLinkQualityToRss(otInstance *aInstance, uint8_t aLinkQuality)	int8_t Converts link quality to typical received signal strength.
otLinkConvertRssToLinkQuality(otInstance *aInstance, int8_t aRss)	uint8_t Converts received signal strength to link quality.
otLinkEnergyScan(otInstance *aInstance, uint32_t aScanChannels, uint16_t aScanDuration, otHandleEnergyScanResult aCallback, void *aCallbackContext)	otError Starts an IEEE 802.15.4 Energy Scan.
otLinkFilterAddAddress(otInstance *aInstance, const otExtAddress *aExtAddress)	otError Adds an Extended Address to MAC filter.
otLinkFilterAddRssIn(otInstance *aInstance, const otExtAddress *aExtAddress, int8_t aRss)	otError Adds the specified Extended Address to the RssIn list (or modifies an existing address in the RssIn list) and sets the received signal strength (in dBm) entry for messages from that address.
otLinkFilterClearAddresses(otInstance *aInstance)	void Clears all the Extended Addresses from MAC filter.
otLinkFilterClearAllRssIn(otInstance *aInstance)	void Clears all the received signal strength (rss) and link quality indicator (lqi) entries (including defaults) from the RssIn list.
otLinkFilterClearDefaultRssIn(otInstance *aInstance)	void Clears any previously set default received signal strength (in dBm) on MAC Filter.
otLinkFilterGetAddressMode(otInstance *aInstance)	otMacFilterAddressMode Gets the address mode of MAC filter.
otLinkFilterGetNextAddress(otInstance *aInstance, otMacFilterIterator *aIterator, otMacFilterEntry *aEntry)	otError Gets an in-use address filter entry.
otLinkFilterGetNextRssIn(otInstance *aInstance, otMacFilterIterator *aIterator, otMacFilterEntry *aEntry)	otError Gets an in-use RssIn filter entry.
otLinkFilterRemoveAddress(otInstance *aInstance, const otExtAddress *aExtAddress)	void Removes an Extended Address from MAC filter.
otLinkFilterRemoveRssIn(otInstance *aInstance, const otExtAddress *aExtAddress)	void Removes the specified Extended Address from the RssIn list.
otLinkFilterSetAddressMode(otInstance *aInstance, otMacFilterAddressMode aMode)	void Sets the address mode of MAC filter.
otLinkFilterSetDefaultRssIn(otInstance *aInstance, int8_t aRss)	void Sets the default received signal strength (in dBm) on MAC Filter.
otLinkGetCcaFailureRate(otInstance *aInstance)	uint16_t Returns the current CCA (Clear Channel Assessment) failure rate.
otLinkGetChannel(otInstance *aInstance)	uint8_t Get the IEEE 802.15.4 channel.
otLinkGetCounters(otInstance *aInstance)	const otMacCounters * Get the MAC layer counters.
otLinkGetCslChannel(otInstance *aInstance)	uint8_t Gets the CSL channel.
otLinkGetCslPeriod(otInstance *aInstance)	uint32_t Gets the CSL period in microseconds.
otLinkGetCslTimeout(otInstance *aInstance)	uint32_t Gets the CSL timeout.
otLinkGetExtendedAddress(otInstance *aInstance)	const otExtAddress * Gets the IEEE 802.15.4 Extended Address.
otLinkGetFactoryAssignedIeeeEui64(otInstance *aInstance, otExtAddress *aEui64)	void Get the factory-assigned IEEE EUI-64.
otLinkGetMaxFrameRetriesDirect(otInstance *aInstance)	uint8_t Returns the maximum number of frame retries during direct transmission.
otLinkGetMaxFrameRetriesIndirect(otInstance *aInstance)	uint8_t Returns the maximum number of frame retries during indirect transmission.
otLinkGetPanId(otInstance *aInstance)	otPanId Get the IEEE 802.15.4 PAN ID.
otLinkGetPollPeriod(otInstance *aInstance)	uint32_t Get the data poll period of sleepy end device.
otLinkGetRegion(otInstance *aInstance, uint16_t *aRegionCode)	otError Get the region code.
otLinkGetShortAddress(otInstance *aInstance)	otShortAddress Get the IEEE 802.15.4 Short Address.
otLinkGetSupportedChannelMask(otInstance *aInstance)	uint32_t Get the supported channel mask of MAC layer.
otLinkGetTxDirectRetrySuccessHistogram(otInstance *aInstance, uint8_t *aNumberOfEntries)	const uint32_t * Gets histogram of retries for a single direct packet until success.
otLinkGetTxIndirectRetrySuccessHistogram(otInstance *aInstance, uint8_t *aNumberOfEntries)	const uint32_t * Gets histogram of retries for a single indirect packet until success.
otLinkIsActiveScanInProgress(otInstance *aInstance)	bool Indicates whether or not an IEEE 802.15.4 Active Scan is currently in progress.
otLinkIsCslEnabled(otInstance *aInstance)	bool Indicates whether or not CSL is enabled.
otLinkIsCslSupported(otInstance *aInstance)	bool Indicates whether the device is connected to a parent which supports CSL.
otLinkIsEnabled(otInstance *aInstance)	bool Indicates whether or not the link layer is enabled.
otLinkIsEnergyScanInProgress(otInstance *aInstance)	bool Indicates whether or not an IEEE 802.15.4 Energy Scan is currently in progress.
otLinkIsInTransmitState(otInstance *aInstance)	bool Indicates whether or not an IEEE 802.15.4 MAC is in the transmit state.
otLinkIsPromiscuous(otInstance *aInstance)	bool Indicates whether or not promiscuous mode is enabled at the link layer.
otLinkIsRadioFilterEnabled(otInstance *aInstance)	bool Indicates whether the IEEE 802.15.4 radio filter is enabled or not.
otLinkResetCounters(otInstance *aInstance)	void Resets the MAC layer counters.
otLinkResetTxRetrySuccessHistogram(otInstance *aInstance)	void Clears histogram statistics for direct and indirect transmissions.
otLinkSendDataRequest(otInstance *aInstance)	otError Enqueues an IEEE 802.15.4 Data Request message for transmission.
otLinkSendEmptyData(otInstance *aInstance)	otError Instructs the device to send an empty IEEE 802.15.4 data frame.
otLinkSetChannel(otInstance *aInstance, uint8_t aChannel)	otError Set the IEEE 802.15.4 channel.
otLinkSetCslChannel(otInstance *aInstance, uint8_t aChannel)	otError Sets the CSL channel.
otLinkSetCslPeriod(otInstance *aInstance, uint32_t aPeriod)	otError Sets the CSL period in microseconds.
otLinkSetCslTimeout(otInstance *aInstance, uint32_t aTimeout)	otError Sets the CSL timeout in seconds.
otLinkSetEnabled(otInstance *aInstance, bool aEnable)	otError Enables or disables the link layer.
otLinkSetExtendedAddress(otInstance *aInstance, const otExtAddress *aExtAddress)	otError Sets the IEEE 802.15.4 Extended Address.
otLinkSetMaxFrameRetriesDirect(otInstance *aInstance, uint8_t aMaxFrameRetriesDirect)	void Sets the maximum number of frame retries during direct transmission.
otLinkSetMaxFrameRetriesIndirect(otInstance *aInstance, uint8_t aMaxFrameRetriesIndirect)	void Sets the maximum number of frame retries during indirect transmission.
otLinkSetPanId(otInstance *aInstance, otPanId aPanId)	otError Set the IEEE 802.15.4 PAN ID.
otLinkSetPcapCallback(otInstance *aInstance, otLinkPcapCallback aPcapCallback, void *aCallbackContext)	void Registers a callback to provide received raw IEEE 802.15.4 frames.
otLinkSetPollPeriod(otInstance *aInstance, uint32_t aPollPeriod)	otError Set/clear user-specified/external data poll period for sleepy end device.
otLinkSetPromiscuous(otInstance *aInstance, bool aPromiscuous)	otError Enables or disables the link layer promiscuous mode.
otLinkSetRadioFilterEnabled(otInstance *aInstance, bool aFilterEnabled)	void Enables/disables IEEE 802.15.4 radio filter mode.
otLinkSetRegion(otInstance *aInstance, uint16_t aRegionCode)	otError Sets the region code.
otLinkSetSupportedChannelMask(otInstance *aInstance, uint32_t aChannelMask)	otError Set the supported channel mask of MAC layer.

Structs
otActiveScanResult	Represents a received IEEE 802.15.4 Beacon.
otEnergyScanResult	Represents an energy scan result.
otMacCounters	Represents the MAC layer counters.
otMacFilterEntry	Represents a Mac Filter entry.
otThreadLinkInfo	Represents link-specific information for messages received from the Thread radio.

Enumerations

otMacFilterAddressMode

 otMacFilterAddressMode

Defines address mode of the mac filter.

Properties
OT_MAC_FILTER_ADDRESS_MODE_ALLOWLIST	Allowlist address filter mode is enabled.
OT_MAC_FILTER_ADDRESS_MODE_DENYLIST	Denylist address filter mode is enabled.
OT_MAC_FILTER_ADDRESS_MODE_DISABLED	Address filter is disabled.

Typedefs

otActiveScanResult

struct otActiveScanResult otActiveScanResult

Represents a received IEEE 802.15.4 Beacon.

otEnergyScanResult

struct otEnergyScanResult otEnergyScanResult

Represents an energy scan result.

otHandleActiveScanResult

void(* otHandleActiveScanResult)(otActiveScanResult *aResult, void *aContext)

Pointer is called during an IEEE 802.15.4 Active Scan when an IEEE 802.15.4 Beacon is received or the scan completes.

Details
Parameters	[in] aResult A valid pointer to the beacon information or NULL when the active scan completes. [in] aContext A pointer to application-specific context.

otHandleEnergyScanResult

void(* otHandleEnergyScanResult)(otEnergyScanResult *aResult, void *aContext)

Pointer is called during an IEEE 802.15.4 Energy Scan when the result for a channel is ready or the scan completes.

Details
Parameters	[in] aResult A valid pointer to the energy scan result information or NULL when the energy scan completes. [in] aContext A pointer to application-specific context.

otLinkPcapCallback

void(* otLinkPcapCallback)(const otRadioFrame *aFrame, bool aIsTx, void *aContext)

Pointer is called when an IEEE 802.15.4 frame is received.

Note: This callback is called after FCS processing and aFrame may not contain the actual FCS that was received.

Note: This callback is called before IEEE 802.15.4 security processing.

Details
Parameters	[in] aFrame A pointer to the received IEEE 802.15.4 frame. [in] aIsTx Whether this frame is transmitted, not received. [in] aContext A pointer to application-specific context.

otMacCounters

struct otMacCounters otMacCounters

Represents the MAC layer counters.

otMacFilterAddressMode

enum otMacFilterAddressMode otMacFilterAddressMode

Defines address mode of the mac filter.

otMacFilterEntry

struct otMacFilterEntry otMacFilterEntry

Represents a Mac Filter entry.

otMacFilterIterator

uint8_t otMacFilterIterator

Used to iterate through mac filter entries.

otThreadLinkInfo

struct otThreadLinkInfo otThreadLinkInfo

Represents link-specific information for messages received from the Thread radio.

Functions

otLinkActiveScan

otError otLinkActiveScan(
  otInstance *aInstance,
  uint32_t aScanChannels,
  uint16_t aScanDuration,
  otHandleActiveScanResult aCallback,
  void *aCallbackContext
)

Starts an IEEE 802.15.4 Active Scan.

Details
Parameters	[in] aInstance A pointer to an OpenThread instance. [in] aScanChannels A bit vector indicating which channels to scan (e.g. OT_CHANNEL_11_MASK). [in] aScanDuration The time in milliseconds to spend scanning each channel. [in] aCallback A pointer to a function called on receiving a beacon or scan completes. [in] aCallbackContext A pointer to application-specific context.
Return Values	OT_ERROR_NONE Accepted the Active Scan request. OT_ERROR_BUSY Already performing an Active Scan.

otLinkConvertLinkQualityToRss

int8_t otLinkConvertLinkQualityToRss(
  otInstance *aInstance,
  uint8_t aLinkQuality
)

Converts link quality to typical received signal strength.

Details
Parameters	[in] aInstance A pointer to an OpenThread instance. [in] aLinkQuality LinkQuality value, should be in range [0,3].
Returns	Typical platform received signal strength mapping to aLinkQuality.

otLinkConvertRssToLinkQuality

uint8_t otLinkConvertRssToLinkQuality(
  otInstance *aInstance,
  int8_t aRss
)

Converts received signal strength to link quality.

Details
Parameters	[in] aInstance A pointer to an OpenThread instance. [in] aRss The received signal strength value to be converted.
Returns	Link quality value mapping to aRss.

otLinkEnergyScan

otError otLinkEnergyScan(
  otInstance *aInstance,
  uint32_t aScanChannels,
  uint16_t aScanDuration,
  otHandleEnergyScanResult aCallback,
  void *aCallbackContext
)

Starts an IEEE 802.15.4 Energy Scan.

Details
Parameters	[in] aInstance A pointer to an OpenThread instance. [in] aScanChannels A bit vector indicating on which channels to perform energy scan. [in] aScanDuration The time in milliseconds to spend scanning each channel. [in] aCallback A pointer to a function called to pass on scan result on indicate scan completion. [in] aCallbackContext A pointer to application-specific context.
Return Values	OT_ERROR_NONE Accepted the Energy Scan request. OT_ERROR_BUSY Could not start the energy scan.

otLinkFilterAddAddress

otError otLinkFilterAddAddress(
  otInstance *aInstance,
  const otExtAddress *aExtAddress
)

Adds an Extended Address to MAC filter.

Is available when OPENTHREAD_CONFIG_MAC_FILTER_ENABLE configuration is enabled.

Details
Parameters	[in] aInstance A pointer to an OpenThread instance. [in] aExtAddress A pointer to the Extended Address (MUST NOT be NULL).
Return Values	OT_ERROR_NONE Successfully added aExtAddress to MAC filter. OT_ERROR_NO_BUFS No available entry exists.

otLinkFilterAddRssIn

otError otLinkFilterAddRssIn(
  otInstance *aInstance,
  const otExtAddress *aExtAddress,
  int8_t aRss
)

Adds the specified Extended Address to the RssIn list (or modifies an existing address in the RssIn list) and sets the received signal strength (in dBm) entry for messages from that address.

The Extended Address does not necessarily have to be in the address allowlist/denylist filter to set the rss.

Note: The RssIn list contains Extended Addresses whose rss or link quality indicator (lqi) values have been set to be different from the defaults.

Is available when OPENTHREAD_CONFIG_MAC_FILTER_ENABLE configuration is enabled.

Details
Parameters	[in] aInstance A pointer to an OpenThread instance. [in] aExtAddress A pointer to the IEEE 802.15.4 Extended Address. MUST NOT be NULL. [in] aRss A received signal strength (in dBm).
Return Values	OT_ERROR_NONE Successfully added an entry for aExtAddress and aRss. OT_ERROR_NO_BUFS No available entry exists.

otLinkFilterClearAddresses

void otLinkFilterClearAddresses(
  otInstance *aInstance
)

Clears all the Extended Addresses from MAC filter.

Is available when OPENTHREAD_CONFIG_MAC_FILTER_ENABLE configuration is enabled.

Details
Parameters	[in] aInstance A pointer to an OpenThread instance.

otLinkFilterClearAllRssIn

void otLinkFilterClearAllRssIn(
  otInstance *aInstance
)

Clears all the received signal strength (rss) and link quality indicator (lqi) entries (including defaults) from the RssIn list.

Performing this action means that all Extended Addresses will use the on-air signal.

Is available when OPENTHREAD_CONFIG_MAC_FILTER_ENABLE configuration is enabled.

Details
Parameters	[in] aInstance A pointer to an OpenThread instance.

otLinkFilterClearDefaultRssIn

void otLinkFilterClearDefaultRssIn(
  otInstance *aInstance
)

Clears any previously set default received signal strength (in dBm) on MAC Filter.

Is available when OPENTHREAD_CONFIG_MAC_FILTER_ENABLE configuration is enabled.

Details
Parameters	[in] aInstance A pointer to an OpenThread instance.

otLinkFilterGetAddressMode

otMacFilterAddressMode otLinkFilterGetAddressMode(
  otInstance *aInstance
)

Gets the address mode of MAC filter.

Is available when OPENTHREAD_CONFIG_MAC_FILTER_ENABLE configuration is enabled.

Details
Parameters	[in] aInstance A pointer to an OpenThread instance.
Returns	the address mode.

otLinkFilterGetNextAddress

otError otLinkFilterGetNextAddress(
  otInstance *aInstance,
  otMacFilterIterator *aIterator,
  otMacFilterEntry *aEntry
)

Gets an in-use address filter entry.

Is available when OPENTHREAD_CONFIG_MAC_FILTER_ENABLE configuration is enabled.

Details
Parameters	[in] aInstance A pointer to an OpenThread instance. [in,out] aIterator A pointer to the MAC filter iterator context. To get the first in-use address filter entry, it should be set to OT_MAC_FILTER_ITERATOR_INIT. MUST NOT be NULL. [out] aEntry A pointer to where the information is placed. MUST NOT be NULL.
Return Values	OT_ERROR_NONE Successfully retrieved an in-use address filter entry. OT_ERROR_NOT_FOUND No subsequent entry exists.

otLinkFilterGetNextRssIn

otError otLinkFilterGetNextRssIn(
  otInstance *aInstance,
  otMacFilterIterator *aIterator,
  otMacFilterEntry *aEntry
)

Gets an in-use RssIn filter entry.

Is available when OPENTHREAD_CONFIG_MAC_FILTER_ENABLE configuration is enabled.

Details
Parameters	[in] aInstance A pointer to an OpenThread instance. [in,out] aIterator A pointer to the MAC filter iterator context. MUST NOT be NULL. To get the first entry, it should be set to OT_MAC_FILTER_ITERATOR_INIT. [out] aEntry A pointer to where the information is placed. The last entry would have the extended address as all 0xff to indicate the default received signal strength if it was set. aEntry MUST NOT be NULL.
Return Values	OT_ERROR_NONE Successfully retrieved the next entry. OT_ERROR_NOT_FOUND No subsequent entry exists.

otLinkFilterRemoveAddress

void otLinkFilterRemoveAddress(
  otInstance *aInstance,
  const otExtAddress *aExtAddress
)

Removes an Extended Address from MAC filter.

Is available when OPENTHREAD_CONFIG_MAC_FILTER_ENABLE configuration is enabled.

No action is performed if there is no existing entry in Filter matching the given Extended Address.

Details
Parameters	[in] aInstance A pointer to an OpenThread instance. [in] aExtAddress A pointer to the Extended Address (MUST NOT be NULL).

otLinkFilterRemoveRssIn

void otLinkFilterRemoveRssIn(
  otInstance *aInstance,
  const otExtAddress *aExtAddress
)

Removes the specified Extended Address from the RssIn list.

Once removed from the RssIn list, this MAC address will instead use the default rss and lqi settings, assuming defaults have been set. (If no defaults have been set, the over-air signal is used.)

Is available when OPENTHREAD_CONFIG_MAC_FILTER_ENABLE configuration is enabled.

No action is performed if there is no existing entry in the RssIn list matching the specified Extended Address.

Details
Parameters	[in] aInstance A pointer to an OpenThread instance. [in] aExtAddress A pointer to the IEEE 802.15.4 Extended Address. MUST NOT be NULL.

otLinkFilterSetAddressMode

void otLinkFilterSetAddressMode(
  otInstance *aInstance,
  otMacFilterAddressMode aMode
)

Sets the address mode of MAC filter.

Is available when OPENTHREAD_CONFIG_MAC_FILTER_ENABLE configuration is enabled.

Details
Parameters	[in] aInstance A pointer to an OpenThread instance. [in] aMode The address mode to set.

otLinkFilterSetDefaultRssIn

void otLinkFilterSetDefaultRssIn(
  otInstance *aInstance,
  int8_t aRss
)

Sets the default received signal strength (in dBm) on MAC Filter.

Is available when OPENTHREAD_CONFIG_MAC_FILTER_ENABLE configuration is enabled.

The default RSS value is used for all received frames from addresses for which there is no explicit RSS-IN entry in the Filter list (added using otLinkFilterAddRssIn()).

Details
Parameters	[in] aInstance A pointer to an OpenThread instance. [in] aRss The default received signal strength (in dBm) to set.

otLinkGetCcaFailureRate

uint16_t otLinkGetCcaFailureRate(
  otInstance *aInstance
)

Returns the current CCA (Clear Channel Assessment) failure rate.

The rate is maintained over a window of (roughly) last OPENTHREAD_CONFIG_CCA_FAILURE_RATE_AVERAGING_WINDOW frame transmissions.

Details
Returns	The CCA failure rate with maximum value 0xffff corresponding to 100% failure rate.

otLinkGetChannel

uint8_t otLinkGetChannel(
  otInstance *aInstance
)

Get the IEEE 802.15.4 channel.

Details
Parameters	[in] aInstance A pointer to an OpenThread instance.
Returns	The IEEE 802.15.4 channel.

See also:
otLinkSetChannel

otLinkGetCounters

const otMacCounters * otLinkGetCounters(
  otInstance *aInstance
)

Get the MAC layer counters.

Details
Parameters	[in] aInstance A pointer to an OpenThread instance.
Returns	A pointer to the MAC layer counters.

otLinkGetCslChannel

uint8_t otLinkGetCslChannel(
  otInstance *aInstance
)

Gets the CSL channel.

Details
Parameters	[in] aInstance A pointer to an OpenThread instance.
Returns	The CSL channel.

otLinkGetCslPeriod

uint32_t otLinkGetCslPeriod(
  otInstance *aInstance
)

Gets the CSL period in microseconds.

Details
Parameters	[in] aInstance A pointer to an OpenThread instance.
Returns	The CSL period in microseconds.

otLinkGetCslTimeout

uint32_t otLinkGetCslTimeout(
  otInstance *aInstance
)

Gets the CSL timeout.

Details
Parameters	[in] aInstance A pointer to an OpenThread instance.
Returns	The CSL timeout in seconds.

otLinkGetExtendedAddress

const otExtAddress * otLinkGetExtendedAddress(
  otInstance *aInstance
)

Gets the IEEE 802.15.4 Extended Address.

Details
Parameters	[in] aInstance A pointer to an OpenThread instance.
Returns	A pointer to the IEEE 802.15.4 Extended Address.

otLinkGetFactoryAssignedIeeeEui64

void otLinkGetFactoryAssignedIeeeEui64(
  otInstance *aInstance,
  otExtAddress *aEui64
)

Get the factory-assigned IEEE EUI-64.

Details
Parameters	[in] aInstance A pointer to the OpenThread instance. [out] aEui64 A pointer to where the factory-assigned IEEE EUI-64 is placed.

otLinkGetMaxFrameRetriesDirect

uint8_t otLinkGetMaxFrameRetriesDirect(
  otInstance *aInstance
)

Returns the maximum number of frame retries during direct transmission.

Details
Parameters	[in] aInstance A pointer to an OpenThread instance.
Returns	The maximum number of retries during direct transmission.

otLinkGetMaxFrameRetriesIndirect

uint8_t otLinkGetMaxFrameRetriesIndirect(
  otInstance *aInstance
)

Returns the maximum number of frame retries during indirect transmission.

Details
Parameters	[in] aInstance A pointer to an OpenThread instance.
Returns	The maximum number of retries during indirect transmission.

otLinkGetPanId

otPanId otLinkGetPanId(
  otInstance *aInstance
)

Get the IEEE 802.15.4 PAN ID.

Details
Parameters	[in] aInstance A pointer to an OpenThread instance.
Returns	The IEEE 802.15.4 PAN ID.

See also:
otLinkSetPanId

otLinkGetPollPeriod

uint32_t otLinkGetPollPeriod(
  otInstance *aInstance
)

Get the data poll period of sleepy end device.

Details
Parameters	[in] aInstance A pointer to an OpenThread instance.
Returns	The data poll period of sleepy end device in milliseconds.

See also:
otLinkSetPollPeriod

otLinkGetRegion

otError otLinkGetRegion(
  otInstance *aInstance,
  uint16_t *aRegionCode
)

Get the region code.

The radio region format is the 2-bytes ascii representation of the ISO 3166 alpha-2 code.

Details
Parameters	[in] aInstance The OpenThread instance structure. [out] aRegionCode The radio region code. The aRegionCode >> 8 is first ascii char and the aRegionCode & 0xff is the second ascii char.
Return Values	OT_ERROR_INVALID_ARGS aRegionCode is nullptr. OT_ERROR_FAILED Other platform specific errors. OT_ERROR_NONE Successfully got region code. OT_ERROR_NOT_IMPLEMENTED The feature is not implemented.

otLinkGetShortAddress

otShortAddress otLinkGetShortAddress(
  otInstance *aInstance
)

Get the IEEE 802.15.4 Short Address.

Details
Parameters	[in] aInstance A pointer to an OpenThread instance.
Returns	A pointer to the IEEE 802.15.4 Short Address.

otLinkGetSupportedChannelMask

uint32_t otLinkGetSupportedChannelMask(
  otInstance *aInstance
)

Get the supported channel mask of MAC layer.

Details
Parameters	[in] aInstance A pointer to an OpenThread instance.
Returns	The supported channel mask as uint32_t with bit 0 (lsb) mapping to channel 0, bit 1 to channel 1, so on.

otLinkGetTxDirectRetrySuccessHistogram

const uint32_t * otLinkGetTxDirectRetrySuccessHistogram(
  otInstance *aInstance,
  uint8_t *aNumberOfEntries
)

Gets histogram of retries for a single direct packet until success.

Is valid when OPENTHREAD_CONFIG_MAC_RETRY_SUCCESS_HISTOGRAM_ENABLE configuration is enabled.

Details
Parameters	[in] aInstance A pointer to an OpenThread instance. [out] aNumberOfEntries A pointer to where the size of returned histogram array is placed.
Returns	A pointer to the histogram of retries (in a form of an array). The n-th element indicates that the packet has been sent with n-th retry.

otLinkGetTxIndirectRetrySuccessHistogram

const uint32_t * otLinkGetTxIndirectRetrySuccessHistogram(
  otInstance *aInstance,
  uint8_t *aNumberOfEntries
)

Gets histogram of retries for a single indirect packet until success.

Is valid when OPENTHREAD_CONFIG_MAC_RETRY_SUCCESS_HISTOGRAM_ENABLE configuration is enabled.

Details
Parameters	[in] aInstance A pointer to an OpenThread instance. [out] aNumberOfEntries A pointer to where the size of returned histogram array is placed.
Returns	A pointer to the histogram of retries (in a form of an array). The n-th element indicates that the packet has been sent with n-th retry.

otLinkIsActiveScanInProgress

bool otLinkIsActiveScanInProgress(
  otInstance *aInstance
)

Indicates whether or not an IEEE 802.15.4 Active Scan is currently in progress.

Details
Parameters	[in] aInstance A pointer to an OpenThread instance.
Returns	true if an IEEE 802.15.4 Active Scan is in progress, false otherwise.

otLinkIsCslEnabled

bool otLinkIsCslEnabled(
  otInstance *aInstance
)

Indicates whether or not CSL is enabled.

Details
Parameters	[in] aInstance A pointer to an OpenThread instance.
Return Values	TRUE Link layer is CSL enabled. FALSE Link layer is not CSL enabled.

otLinkIsCslSupported

bool otLinkIsCslSupported(
  otInstance *aInstance
)

Indicates whether the device is connected to a parent which supports CSL.

Details
Return Values	TRUE If parent supports CSL. FALSE If parent does not support CSL.

otLinkIsEnabled

bool otLinkIsEnabled(
  otInstance *aInstance
)

Indicates whether or not the link layer is enabled.

Details
Parameters	[in] aInstance A pointer to an OpenThread instance.
Return Values	TRUE Link layer is enabled. FALSE Link layer is not enabled.

otLinkIsEnergyScanInProgress

bool otLinkIsEnergyScanInProgress(
  otInstance *aInstance
)

Indicates whether or not an IEEE 802.15.4 Energy Scan is currently in progress.

Details
Parameters	[in] aInstance A pointer to an OpenThread instance.
Returns	true if an IEEE 802.15.4 Energy Scan is in progress, false otherwise.

otLinkIsInTransmitState

bool otLinkIsInTransmitState(
  otInstance *aInstance
)

Indicates whether or not an IEEE 802.15.4 MAC is in the transmit state.

MAC module is in the transmit state during CSMA/CA procedure, CCA, Data, Beacon or Data Request frame transmission and receiving an ACK of a transmitted frame. MAC module is not in the transmit state during transmission of an ACK frame or a Beacon Request frame.

Details
Parameters	[in] aInstance A pointer to an OpenThread instance.
Returns	true if an IEEE 802.15.4 MAC is in the transmit state, false otherwise.

otLinkIsPromiscuous

bool otLinkIsPromiscuous(
  otInstance *aInstance
)

Indicates whether or not promiscuous mode is enabled at the link layer.

Details
Parameters	[in] aInstance A pointer to an OpenThread instance.
Return Values	TRUE Promiscuous mode is enabled. FALSE Promiscuous mode is not enabled.

otLinkIsRadioFilterEnabled

bool otLinkIsRadioFilterEnabled(
  otInstance *aInstance
)

Indicates whether the IEEE 802.15.4 radio filter is enabled or not.

Is available when OPENTHREAD_CONFIG_MAC_FILTER_ENABLE configuration is enabled.

Details
Return Values	TRUE If the radio filter is enabled. FALSE If the radio filter is disabled.

otLinkResetCounters

void otLinkResetCounters(
  otInstance *aInstance
)

Resets the MAC layer counters.

Details
Parameters	[in] aInstance A pointer to an OpenThread instance.

otLinkResetTxRetrySuccessHistogram

void otLinkResetTxRetrySuccessHistogram(
  otInstance *aInstance
)

Clears histogram statistics for direct and indirect transmissions.

Is valid when OPENTHREAD_CONFIG_MAC_RETRY_SUCCESS_HISTOGRAM_ENABLE configuration is enabled.

Details
Parameters	[in] aInstance A pointer to an OpenThread instance.

otLinkSendDataRequest

otError otLinkSendDataRequest(
  otInstance *aInstance
)

Enqueues an IEEE 802.15.4 Data Request message for transmission.

Details
Parameters	[in] aInstance A pointer to an OpenThread instance.
Return Values	OT_ERROR_NONE Successfully enqueued an IEEE 802.15.4 Data Request message. OT_ERROR_INVALID_STATE Device is not in rx-off-when-idle mode. OT_ERROR_NO_BUFS Insufficient message buffers available.

otLinkSendEmptyData

otError otLinkSendEmptyData(
  otInstance *aInstance
)

Instructs the device to send an empty IEEE 802.15.4 data frame.

Is only supported on an Rx-Off-When-Idle device to send an empty data frame to its parent. Note: available only when OPENTHREAD_CONFIG_REFERENCE_DEVICE_ENABLE is enabled.

Details
Parameters	[in] aInstance A pointer to an OpenThread instance.
Return Values	OT_ERROR_NONE Successfully enqueued an empty message. OT_ERROR_INVALID_STATE Device is not in Rx-Off-When-Idle mode. OT_ERROR_NO_BUFS Insufficient message buffers available.

otLinkSetChannel

otError otLinkSetChannel(
  otInstance *aInstance,
  uint8_t aChannel
)

Set the IEEE 802.15.4 channel.

Succeeds only when Thread protocols are disabled. A successful call to this function invalidates the Active and Pending Operational Datasets in non-volatile memory.

Details
Parameters	[in] aInstance A pointer to an OpenThread instance. [in] aChannel The IEEE 802.15.4 channel.
Return Values	OT_ERROR_NONE Successfully set the channel. OT_ERROR_INVALID_ARGS If aChannel is not in the range [11, 26] or is not in the supported channel mask. OT_ERROR_INVALID_STATE Thread protocols are enabled.

See also:
otLinkGetChannel

otLinkSetCslChannel

otError otLinkSetCslChannel(
  otInstance *aInstance,
  uint8_t aChannel
)

Sets the CSL channel.

Details
Parameters	[in] aInstance A pointer to an OpenThread instance. [in] aChannel The CSL sample channel. Channel value should be 0 (Set CSL Channel unspecified) or within the range [1, 10] (if 915-MHz supported) and 11, 26.
Return Values	OT_ERROR_NONE Successfully set the CSL parameters. OT_ERROR_INVALID_ARGS Invalid aChannel.

otLinkSetCslPeriod

otError otLinkSetCslPeriod(
  otInstance *aInstance,
  uint32_t aPeriod
)

Sets the CSL period in microseconds.

Disable CSL by setting this parameter to 0.

The CSL period MUST be a multiple of OT_LINK_CSL_PERIOD_TEN_SYMBOLS_UNIT_IN_USEC, otherwise OT_ERROR_INVALID_ARGS is returned.

Details
Parameters	[in] aInstance A pointer to an OpenThread instance. [in] aPeriod The CSL period in microseconds.
Return Values	OT_ERROR_NONE Successfully set the CSL period. OT_ERROR_INVALID_ARGS Invalid CSL period

otLinkSetCslTimeout

otError otLinkSetCslTimeout(
  otInstance *aInstance,
  uint32_t aTimeout
)

Sets the CSL timeout in seconds.

Details
Parameters	[in] aInstance A pointer to an OpenThread instance. [in] aTimeout The CSL timeout in seconds.
Return Values	OT_ERROR_NONE Successfully set the CSL timeout. OT_ERROR_INVALID_ARGS Invalid CSL timeout.

otLinkSetEnabled

otError otLinkSetEnabled(
  otInstance *aInstance,
  bool aEnable
)

Enables or disables the link layer.

Note: The link layer may only be enabled / disabled when the Thread Interface is disabled.

Details
Parameters	[in] aInstance A pointer to an OpenThread instance. [in] aEnable true to enable the link layer, or false otherwise.
Return Values	OT_ERROR_NONE Successfully enabled / disabled the link layer. OT_ERROR_INVALID_STATE Could not disable the link layer because the Thread interface is enabled.

otLinkSetExtendedAddress

otError otLinkSetExtendedAddress(
  otInstance *aInstance,
  const otExtAddress *aExtAddress
)

Sets the IEEE 802.15.4 Extended Address.

Note: Only succeeds when Thread protocols are disabled.

Details
Parameters	[in] aInstance A pointer to an OpenThread instance. [in] aExtAddress A pointer to the IEEE 802.15.4 Extended Address.
Return Values	OT_ERROR_NONE Successfully set the IEEE 802.15.4 Extended Address. OT_ERROR_INVALID_ARGS aExtAddress was NULL. OT_ERROR_INVALID_STATE Thread protocols are enabled.

otLinkSetMaxFrameRetriesDirect

void otLinkSetMaxFrameRetriesDirect(
  otInstance *aInstance,
  uint8_t aMaxFrameRetriesDirect
)

Sets the maximum number of frame retries during direct transmission.

Details
Parameters	[in] aInstance A pointer to an OpenThread instance. [in] aMaxFrameRetriesDirect The maximum number of retries during direct transmission.

otLinkSetMaxFrameRetriesIndirect

void otLinkSetMaxFrameRetriesIndirect(
  otInstance *aInstance,
  uint8_t aMaxFrameRetriesIndirect
)

Sets the maximum number of frame retries during indirect transmission.

Details
Parameters	[in] aInstance A pointer to an OpenThread instance. [in] aMaxFrameRetriesIndirect The maximum number of retries during indirect transmission.

otLinkSetPanId

otError otLinkSetPanId(
  otInstance *aInstance,
  otPanId aPanId
)

Set the IEEE 802.15.4 PAN ID.

Succeeds only when Thread protocols are disabled. A successful call to this function also invalidates the Active and Pending Operational Datasets in non-volatile memory.

Details
Parameters	[in] aInstance A pointer to an OpenThread instance. [in] aPanId The IEEE 802.15.4 PAN ID.
Return Values	OT_ERROR_NONE Successfully set the PAN ID. OT_ERROR_INVALID_ARGS If aPanId is not in the range [0, 65534]. OT_ERROR_INVALID_STATE Thread protocols are enabled.

See also:
otLinkGetPanId

otLinkSetPcapCallback

void otLinkSetPcapCallback(
  otInstance *aInstance,
  otLinkPcapCallback aPcapCallback,
  void *aCallbackContext
)

Registers a callback to provide received raw IEEE 802.15.4 frames.

Details
Parameters	[in] aInstance A pointer to an OpenThread instance. [in] aPcapCallback A pointer to a function that is called when receiving an IEEE 802.15.4 link frame or NULL to disable the callback. [in] aCallbackContext A pointer to application-specific context.

otLinkSetPollPeriod

otError otLinkSetPollPeriod(
  otInstance *aInstance,
  uint32_t aPollPeriod
)

Set/clear user-specified/external data poll period for sleepy end device.

Note: This function updates only poll period of sleepy end device. To update child timeout the function otThreadSetChildTimeout() shall be called.

Note: Minimal non-zero value should be OPENTHREAD_CONFIG_MAC_MINIMUM_POLL_PERIOD (10ms). Or zero to clear user-specified poll period.

Note: User-specified value should be no more than the maximal value 0x3FFFFFF ((1 << 26) - 1) allowed, otherwise it would be clipped by the maximal value.

Details
Parameters	[in] aInstance A pointer to an OpenThread instance. [in] aPollPeriod data poll period in milliseconds.
Return Values	OT_ERROR_NONE Successfully set/cleared user-specified poll period. OT_ERROR_INVALID_ARGS If aPollPeriod is invalid.

See also:
otLinkGetPollPeriod

otLinkSetPromiscuous

otError otLinkSetPromiscuous(
  otInstance *aInstance,
  bool aPromiscuous
)

Enables or disables the link layer promiscuous mode.

Note: Promiscuous mode may only be enabled when the Thread interface is disabled.

Details
Parameters	[in] aInstance A pointer to an OpenThread instance. [in] aPromiscuous true to enable promiscuous mode, or false otherwise.
Return Values	OT_ERROR_NONE Successfully enabled promiscuous mode. OT_ERROR_INVALID_STATE Could not enable promiscuous mode because the Thread interface is enabled.

otLinkSetRadioFilterEnabled

void otLinkSetRadioFilterEnabled(
  otInstance *aInstance,
  bool aFilterEnabled
)

Enables/disables IEEE 802.15.4 radio filter mode.

Is available when OPENTHREAD_CONFIG_MAC_FILTER_ENABLE configuration is enabled.

The radio filter is mainly intended for testing. It can be used to temporarily block all tx/rx on the 802.15.4 radio. When radio filter is enabled, radio is put to sleep instead of receive (to ensure device does not receive any frame and/or potentially send ack). Also the frame transmission requests return immediately without sending the frame over the air (return "no ack" error if ack is requested, otherwise return success).

Details
Parameters	[in] aInstance A pointer to an OpenThread instance. [in] aFilterEnabled TRUE to enable radio filter, FALSE to disable

otLinkSetRegion

otError otLinkSetRegion(
  otInstance *aInstance,
  uint16_t aRegionCode
)

Sets the region code.

The radio region format is the 2-bytes ascii representation of the ISO 3166 alpha-2 code.

Details
Parameters	[in] aInstance The OpenThread instance structure. [in] aRegionCode The radio region code. The aRegionCode >> 8 is first ascii char and the aRegionCode & 0xff is the second ascii char.
Return Values	OT_ERROR_FAILED Other platform specific errors. OT_ERROR_NONE Successfully set region code. OT_ERROR_NOT_IMPLEMENTED The feature is not implemented.

otLinkSetSupportedChannelMask

otError otLinkSetSupportedChannelMask(
  otInstance *aInstance,
  uint32_t aChannelMask
)

Set the supported channel mask of MAC layer.

Succeeds only when Thread protocols are disabled.

Details
Parameters	[in] aInstance A pointer to an OpenThread instance. [in] aChannelMask The supported channel mask (bit 0 or lsb mapping to channel 0, and so on).
Return Values	OT_ERROR_NONE Successfully set the supported channel mask. OT_ERROR_INVALID_STATE Thread protocols are enabled.

Macros

OT_LINK_CSL_PERIOD_TEN_SYMBOLS_UNIT_IN_USEC

 OT_LINK_CSL_PERIOD_TEN_SYMBOLS_UNIT_IN_USEC (160)

Represents CSL period ten symbols unit in microseconds.

The CSL period (in micro seconds) MUST be a multiple of this value.

OT_MAC_FILTER_FIXED_RSS_DISABLED

 OT_MAC_FILTER_FIXED_RSS_DISABLED 127

Used to indicate no fixed received signal strength was set.

OT_MAC_FILTER_ITERATOR_INIT

 OT_MAC_FILTER_ITERATOR_INIT 0

Initializer for otMacFilterIterator.

OT_US_PER_TEN_SYMBOLS

 OT_US_PER_TEN_SYMBOLS OT_RADIO_TEN_SYMBOLS_TIME

Time for 10 symbols in units of microseconds.

Resources

OpenThread API Reference topics originate from the source code, available on GitHub. For more information, or to contribute to our documentation, refer to Resources.