/* * 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 * @brief * This file includes the OpenThread API for channel monitoring feature */ #ifndef OPENTHREAD_CHANNEL_MONITOR_H_ #define OPENTHREAD_CHANNEL_MONITOR_H_ #include #ifdef __cplusplus extern "C" { #endif /** * @addtogroup api-channel-monitor * * @brief * This module includes functions for channel monitoring feature. * * The functions in this module are available when channel monitor feature * (`OPENTHREAD_CONFIG_CHANNEL_MONITOR_ENABLE`) is enabled. * * Channel monitoring will periodically monitor all channels to help determine the cleaner channels (channels * with less interference). * * When channel monitoring is active, a zero-duration Energy Scan is performed, collecting a single RSSI sample on * every channel per sample interval. The RSSI samples are compared with a pre-specified RSSI threshold. As an * indicator of channel quality, the channel monitoring module maintains and provides the average rate/percentage of * RSSI samples that are above the threshold within (approximately) a specified sample window (referred to as channel * occupancy). * * @{ * */ /** * Enables or disables the Channel Monitoring operation. * * Once operation starts, any previously collected data is cleared. However, after operation is disabled, the previous * collected data is still valid and can be read. * * @note OpenThread core internally enables or disables the Channel Monitoring operation when the IPv6 interface is * brought up or down, for example in a call to `otIp6SetEnabled()`. * * @param[in] aInstance A pointer to an OpenThread instance. * @param[in] aEnabled TRUE to enable/start Channel Monitoring operation, FALSE to disable/stop it. * * @retval OT_ERROR_NONE Channel Monitoring state changed successfully * @retval OT_ERROR_ALREADY Channel Monitoring is already in the same state. * */ otError otChannelMonitorSetEnabled(otInstance *aInstance, bool aEnabled); /** * Indicates whether the Channel Monitoring operation is enabled and running. * * @param[in] aInstance A pointer to an OpenThread instance. * * @returns TRUE if the Channel Monitoring operation is enabled, FALSE otherwise. * */ bool otChannelMonitorIsEnabled(otInstance *aInstance); /** * Get channel monitoring sample interval in milliseconds. * * @param[in] aInstance A pointer to an OpenThread instance. * * @returns The channel monitor sample interval in milliseconds. * */ uint32_t otChannelMonitorGetSampleInterval(otInstance *aInstance); /** * Get channel monitoring RSSI threshold in dBm. * * @param[in] aInstance A pointer to an OpenThread instance. * * @returns The RSSI threshold in dBm. * */ int8_t otChannelMonitorGetRssiThreshold(otInstance *aInstance); /** * Get channel monitoring averaging sample window length (number of samples). * * @param[in] aInstance A pointer to an OpenThread instance. * * @returns The averaging sample window. * */ uint32_t otChannelMonitorGetSampleWindow(otInstance *aInstance); /** * Get channel monitoring total number of RSSI samples (per channel). * * The count indicates total number samples per channel by channel monitoring module since its start (since Thread * network interface was enabled). * * @param[in] aInstance A pointer to an OpenThread instance. * * @returns Total number of RSSI samples (per channel) taken so far. * */ uint32_t otChannelMonitorGetSampleCount(otInstance *aInstance); /** * Gets the current channel occupancy for a given channel. * * The channel occupancy value represents the average rate/percentage of RSSI samples that were above RSSI threshold * ("bad" RSSI samples). * * For the first "sample window" samples, the average is maintained as the actual percentage (i.e., ratio of number * of "bad" samples by total number of samples). After "window" samples, the averager uses an exponentially * weighted moving average. Practically, this means the average is representative of up to `3 * window` last samples * with highest weight given to the latest `kSampleWindow` samples. * * Max value of `0xffff` indicates all RSSI samples were above RSSI threshold (i.e. 100% of samples were "bad"). * * @param[in] aInstance A pointer to an OpenThread instance. * @param[in] aChannel The channel for which to get the link occupancy. * * @returns The current channel occupancy for the given channel. * */ uint16_t otChannelMonitorGetChannelOccupancy(otInstance *aInstance, uint8_t aChannel); /** * @} * */ #ifdef __cplusplus } // extern "C" #endif #endif // OPENTHREAD_CHANNEL_MONITOR_H_