| /* |
| * Copyright (c) 2018, The OpenThread Authors. |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. Neither the name of the copyright holder nor the |
| * names of its contributors may be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE |
| * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| * POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| /** |
| * @file |
| * This file includes definitions for Thread network time synchronization service. |
| */ |
| |
| #ifndef TIME_SYNC_HPP_ |
| #define TIME_SYNC_HPP_ |
| |
| #include "openthread-core-config.h" |
| |
| #if OPENTHREAD_CONFIG_TIME_SYNC_ENABLE |
| |
| #include <openthread/network_time.h> |
| |
| #include "common/locator.hpp" |
| #include "common/message.hpp" |
| #include "common/non_copyable.hpp" |
| #include "common/notifier.hpp" |
| #include "common/timer.hpp" |
| |
| namespace ot { |
| |
| /** |
| * This class implements OpenThread Time Synchronization Service. |
| * |
| */ |
| class TimeSync : public InstanceLocator, private NonCopyable |
| { |
| friend class ot::Notifier; |
| |
| public: |
| /** |
| * This constructor initializes the object. |
| * |
| */ |
| TimeSync(Instance &aInstance); |
| |
| /** |
| * Get the Thread network time. |
| * |
| * @param[in,out] aNetworkTime The Thread network time in microseconds. |
| * |
| * @returns The time synchronization status. |
| * |
| */ |
| otNetworkTimeStatus GetTime(uint64_t &aNetworkTime) const; |
| |
| /** |
| * Handle the message which includes time synchronization information. |
| * |
| * @param[in] aMessage The message which includes time synchronization information. |
| * |
| */ |
| void HandleTimeSyncMessage(const Message &aMessage); |
| |
| #if OPENTHREAD_FTD |
| /** |
| * Send a time synchronization message when it is required. |
| * |
| * Note: A time synchronization message is required in following cases: |
| * 1. Leader send time sync message periodically; |
| * 2. Router(except Leader) received a time sync message with newer sequence; |
| * 3. Router received a time sync message with older sequence. |
| * |
| */ |
| void ProcessTimeSync(void); |
| #endif |
| |
| /** |
| * This method gets the time synchronization sequence. |
| * |
| * @returns The time synchronization sequence. |
| * |
| */ |
| uint8_t GetTimeSyncSeq(void) const { return mTimeSyncSeq; } |
| |
| /** |
| * This method gets the time offset to the Thread network time. |
| * |
| * @returns The time offset to the Thread network time, in microseconds. |
| * |
| */ |
| int64_t GetNetworkTimeOffset(void) const { return mNetworkTimeOffset; } |
| |
| /** |
| * Set the time synchronization period. |
| * |
| * @param[in] aTimeSyncPeriod The time synchronization period, in seconds. |
| * |
| */ |
| void SetTimeSyncPeriod(uint16_t aTimeSyncPeriod) { mTimeSyncPeriod = aTimeSyncPeriod; } |
| |
| /** |
| * Get the time synchronization period. |
| * |
| * @returns The time synchronization period, in seconds. |
| * |
| */ |
| uint16_t GetTimeSyncPeriod(void) const { return mTimeSyncPeriod; } |
| |
| /** |
| * Set the time synchronization XTAL accuracy threshold for Router. |
| * |
| * @param[in] aXtalThreshold The XTAL accuracy threshold for Router, in PPM. |
| * |
| */ |
| void SetXtalThreshold(uint16_t aXtalThreshold) { mXtalThreshold = aXtalThreshold; } |
| |
| /** |
| * Get the time synchronization XTAL accuracy threshold for Router. |
| * |
| * @returns The XTAL accuracy threshold for Router, in PPM. |
| * |
| */ |
| uint16_t GetXtalThreshold(void) const { return mXtalThreshold; } |
| |
| /** |
| * Set the time sync callback to be notified of a network time update. |
| * |
| * @param[in] aCallback The callback to be called when time sync is handled. |
| * @param[in] aCallbackContext The context to be passed to callback. |
| * |
| */ |
| void SetTimeSyncCallback(otNetworkTimeSyncCallbackFn aCallback, void *aCallbackContext) |
| { |
| mTimeSyncCallback = aCallback; |
| mTimeSyncCallbackContext = aCallbackContext; |
| } |
| |
| /** |
| * Callback to be called when timer expires. |
| * |
| */ |
| void HandleTimeout(void); |
| |
| private: |
| /** |
| * Callback to be called when thread state changes. |
| * |
| * @param[in] aFlags Flags that denote the state change events. |
| * |
| */ |
| void HandleNotifierEvents(Events aEvents); |
| |
| /** |
| * Callback to be called when timer expires. |
| * |
| * @param[in] aTimer The corresponding timer. |
| * |
| */ |
| static void HandleTimeout(Timer &aTimer); |
| |
| /** |
| * Check and handle any status change, and notify observers if applicable. |
| * |
| * @param[in] aNotifyTimeUpdated True to denote that observers should be notified due to a time change, false |
| * otherwise. |
| * |
| */ |
| void CheckAndHandleChanges(bool aNotifyTimeUpdated); |
| |
| /** |
| * Increase the time synchronization sequence. |
| * |
| */ |
| void IncrementTimeSyncSeq(void); |
| |
| /** |
| * Notify any listener of a network time sync update event. |
| * |
| */ |
| void NotifyTimeSyncCallback(void); |
| |
| bool mTimeSyncRequired; ///< Indicate whether or not a time synchronization message is required. |
| uint8_t mTimeSyncSeq; ///< The time synchronization sequence. |
| uint16_t mTimeSyncPeriod; ///< The time synchronization period. |
| uint16_t mXtalThreshold; ///< The XTAL accuracy threshold for a device to become a Router, in PPM. |
| #if OPENTHREAD_FTD |
| TimeMilli mLastTimeSyncSent; ///< The time when the last time synchronization message was sent. |
| #endif |
| TimeMilli mLastTimeSyncReceived; ///< The time when the last time synchronization message was received. |
| int64_t mNetworkTimeOffset; ///< The time offset to the Thread Network time |
| otNetworkTimeSyncCallbackFn |
| mTimeSyncCallback; ///< The callback to be called when time sync is handled or status updated. |
| void * mTimeSyncCallbackContext; ///< The context to be passed to callback. |
| TimerMilli mTimer; ///< Timer for checking if a resync is required. |
| otNetworkTimeStatus mCurrentStatus; ///< Current network time status. |
| }; |
| |
| /** |
| * @} |
| */ |
| |
| } // namespace ot |
| |
| #endif // OPENTHREAD_CONFIG_TIME_SYNC_ENABLE |
| |
| #endif // TIME_SYNC_HPP_ |