Get local ip address after thread/network is setup

[nandra]

Hi,

I'm trying to read local IP adresses of node when is attached to thread network using otIp6GetUnicastAddresses but I'm always getting NULL when added to main. Is there some machanism to wait until everything is setup and get notification that I can start using network because node is setup? Thanks.

[abtink]

Some related APIs and mechansims to check:

• otStateChangedCallback mechasnim for event notifications:
  

  openthread/include/openthread/instance.h

  Lines 190 to 252 in df757ba

  	#define OT_CHANGED_IP6_ADDRESS_ADDED (1U << 0) ///< IPv6 address was added
  	#define OT_CHANGED_IP6_ADDRESS_REMOVED (1U << 1) ///< IPv6 address was removed
  	#define OT_CHANGED_THREAD_ROLE (1U << 2) ///< Role (disabled, detached, child, router, leader) changed
  	#define OT_CHANGED_THREAD_LL_ADDR (1U << 3) ///< The link-local address changed
  	#define OT_CHANGED_THREAD_ML_ADDR (1U << 4) ///< The mesh-local address changed
  	#define OT_CHANGED_THREAD_RLOC_ADDED (1U << 5) ///< RLOC was added
  	#define OT_CHANGED_THREAD_RLOC_REMOVED (1U << 6) ///< RLOC was removed
  	#define OT_CHANGED_THREAD_PARTITION_ID (1U << 7) ///< Partition ID changed
  	#define OT_CHANGED_THREAD_KEY_SEQUENCE_COUNTER (1U << 8) ///< Thread Key Sequence changed
  	#define OT_CHANGED_THREAD_NETDATA (1U << 9) ///< Thread Network Data changed
  	#define OT_CHANGED_THREAD_CHILD_ADDED (1U << 10) ///< Child was added
  	#define OT_CHANGED_THREAD_CHILD_REMOVED (1U << 11) ///< Child was removed
  	#define OT_CHANGED_IP6_MULTICAST_SUBSCRIBED (1U << 12) ///< Subscribed to a IPv6 multicast address
  	#define OT_CHANGED_IP6_MULTICAST_UNSUBSCRIBED (1U << 13) ///< Unsubscribed from a IPv6 multicast address
  	#define OT_CHANGED_THREAD_CHANNEL (1U << 14) ///< Thread network channel changed
  	#define OT_CHANGED_THREAD_PANID (1U << 15) ///< Thread network PAN Id changed
  	#define OT_CHANGED_THREAD_NETWORK_NAME (1U << 16) ///< Thread network name changed
  	#define OT_CHANGED_THREAD_EXT_PANID (1U << 17) ///< Thread network extended PAN ID changed
  	#define OT_CHANGED_NETWORK_KEY (1U << 18) ///< Network key changed
  	#define OT_CHANGED_PSKC (1U << 19) ///< PSKc changed
  	#define OT_CHANGED_SECURITY_POLICY (1U << 20) ///< Security Policy changed
  	#define OT_CHANGED_CHANNEL_MANAGER_NEW_CHANNEL (1U << 21) ///< Channel Manager new pending Thread channel changed
  	#define OT_CHANGED_SUPPORTED_CHANNEL_MASK (1U << 22) ///< Supported channel mask changed
  	#define OT_CHANGED_COMMISSIONER_STATE (1U << 23) ///< Commissioner state changed
  	#define OT_CHANGED_THREAD_NETIF_STATE (1U << 24) ///< Thread network interface state changed
  	#define OT_CHANGED_THREAD_BACKBONE_ROUTER_STATE (1U << 25) ///< Backbone Router state changed
  	#define OT_CHANGED_THREAD_BACKBONE_ROUTER_LOCAL (1U << 26) ///< Local Backbone Router configuration changed
  	#define OT_CHANGED_JOINER_STATE (1U << 27) ///< Joiner state changed
  	#define OT_CHANGED_ACTIVE_DATASET (1U << 28) ///< Active Operational Dataset changed
  	#define OT_CHANGED_PENDING_DATASET (1U << 29) ///< Pending Operational Dataset changed
  	#define OT_CHANGED_NAT64_TRANSLATOR_STATE (1U << 30) ///< The state of NAT64 translator changed
  	#define OT_CHANGED_PARENT_LINK_QUALITY (1U << 31) ///< Parent link quality changed
  	/**
  	* Represents a bit-field indicating specific state/configuration that has changed. See `OT_CHANGED_*`
  	* definitions.
  	*
  	*/
  	typedef uint32_t otChangedFlags;
  	/**
  	* Pointer is called to notify certain configuration or state changes within OpenThread.
  	*
  	* @param[in] aFlags A bit-field indicating specific state that has changed. See `OT_CHANGED_*` definitions.
  	* @param[in] aContext A pointer to application-specific context.
  	*
  	*/
  	typedef void (*otStateChangedCallback)(otChangedFlags aFlags, void *aContext);
  	/**
  	* Registers a callback to indicate when certain configuration or state changes within OpenThread.
  	*
  	* @param[in] aInstance A pointer to an OpenThread instance.
  	* @param[in] aCallback A pointer to a function that is called with certain configuration or state changes.
  	* @param[in] aContext A pointer to application-specific context.
  	*
  	* @retval OT_ERROR_NONE Added the callback to the list of callbacks.
  	* @retval OT_ERROR_ALREADY The callback was already registered.
  	* @retval OT_ERROR_NO_BUFS Could not add the callback due to resource constraints.
  	*
  	*/
  	otError otSetStateChangedCallback(otInstance *aInstance, otStateChangedCallback aCallback, void *aContext);

---

• otIp6SetAddressCallback() to be notified of address changed:

openthread/include/openthread/ip6.h

Lines 450 to 483 in df757ba

	/**
	* Represents IPv6 address information.
	*
	*/
	typedef struct otIp6AddressInfo
	{
	const otIp6Address *mAddress; ///< A pointer to the IPv6 address.
	uint8_t mPrefixLength; ///< The prefix length of mAddress if it is a unicast address.
	uint8_t mScope : 4; ///< The scope of this address.
	bool mPreferred : 1; ///< Whether this is a preferred address.
	bool mMeshLocal : 1; ///< Whether this is a mesh-local unicast/anycast address.
	} otIp6AddressInfo;
	/**
	* Pointer is called when an internal IPv6 address is added or removed.
	*
	* @param[in] aAddressInfo A pointer to the IPv6 address information.
	* @param[in] aIsAdded TRUE if the @p aAddress was added, FALSE if @p aAddress was removed.
	* @param[in] aContext A pointer to application-specific context.
	*
	*/
	typedef void (*otIp6AddressCallback)(const otIp6AddressInfo *aAddressInfo, bool aIsAdded, void *aContext);
	/**
	* Registers a callback to notify internal IPv6 address changes.
	*
	* @param[in] aInstance A pointer to an OpenThread instance.
	* @param[in] aCallback A pointer to a function that is called when an internal IPv6 address is added or
	* removed. NULL to disable the callback.
	* @param[in] aCallbackContext A pointer to application-specific context.
	*
	*/
	void otIp6SetAddressCallback(otInstance *aInstance, otIp6AddressCallback aCallback, void *aCallbackContext);

[nandra]

Thanks for response.