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mbed-os/features/lorawan/lorastack/mac/LoRaMac.h

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/**
* \file LoRaMac.h
*
* \brief LoRa MAC layer implementation
*
* \copyright Revised BSD License, see LICENSE.TXT file include in the project
*
* \code
* ______ _
* / _____) _ | |
* ( (____ _____ ____ _| |_ _____ ____| |__
* \____ \| ___ | (_ _) ___ |/ ___) _ \
* _____) ) ____| | | || |_| ____( (___| | | |
* (______/|_____)_|_|_| \__)_____)\____)_| |_|
* (C)2013 Semtech
*
* ___ _____ _ ___ _ _____ ___ ___ ___ ___
* / __|_ _/_\ / __| |/ / __/ _ \| _ \/ __| __|
* \__ \ | |/ _ \ (__| ' <| _| (_) | / (__| _|
* |___/ |_/_/ \_\___|_|\_\_| \___/|_|_\\___|___|
* embedded.connectivity.solutions===============
*
* \endcode
*
* \author Miguel Luis ( Semtech )
*
* \author Gregory Cristian ( Semtech )
*
* \author Daniel Jaeckle ( STACKFORCE )
*
* \defgroup LORAMAC LoRa MAC layer implementation
* This module specifies the API implementation of the LoRaMAC layer.
* This is a placeholder for a detailed description of the LoRaMac
* layer and the supported features.
*
* Copyright (c) 2017, Arm Limited and affiliates.
* SPDX-License-Identifier: BSD-3-Clause
*
*/
#ifndef MBED_LORAWAN_MAC_H__
#define MBED_LORAWAN_MAC_H__
#include "events/EventQueue.h"
#include "lorastack/phy/LoRaPHY.h"
#include "system/LoRaWANTimer.h"
#include "system/lorawan_data_structures.h"
#include "LoRaMacChannelPlan.h"
#include "LoRaMacCommand.h"
#include "LoRaMacCrypto.h"
#if MBED_CONF_RTOS_PRESENT
#include "rtos/Mutex.h"
#endif
#include "platform/ScopedLock.h"
/** LoRaMac Class
* Implementation of LoRaWAN MAC layer
*/
class LoRaMac {
public:
/**
* Constructor
*/
LoRaMac();
/**
* Destructor
*/
~LoRaMac();
/**
* @brief LoRaMAC layer initialization
*
* @details Initializes the LoRaMAC layer,
*
*
* @param queue [in] A pointer to the application provided EventQueue.
*
* @param scheduling_failure_handler A callback to inform upper layer if a deferred
* transmission (after backoff or retry) fails to schedule.
*
* @return `lorawan_status_t` The status of the operation. The possible values are:
* \ref LORAWAN_STATUS_OK
* \ref LORAWAN_STATUS_PARAMETER_INVALID
*/
lorawan_status_t initialize(events::EventQueue *queue,
mbed::Callback<void(void)>scheduling_failure_handler);
/**
* @brief Disconnect LoRaMac layer
*
* @details Cancels all outstanding requests and sets LoRaMac's
* internal state to idle.
*/
void disconnect(void);
/**
* @brief nwk_joined Checks if device has joined to network
* @return True if joined to network, false otherwise
*/
bool nwk_joined();
/**
* @brief Adds a channel plan to the system.
*
* @details Adds a whole channel plan or a single new channel if the plan
* contains only one channel and 'plan.nb_channels' is set to 1.
* Please note that this functionality is not available in all regions.
* Information on the allowed ranges is available at the
* LoRaWAN Regional Parameters V1.0.2rB.
*
* @param plan [in] A reference to application provided channel plan.
*
* @return `lorawan_status_t` The status of the operation. The possible values are:
* \ref LORAWAN_STATUS_OK
* \ref LORAWAN_STATUS_BUSY
* \ref LORAWAN_STATUS_PARAMETER_INVALID
*/
lorawan_status_t add_channel_plan(const lorawan_channelplan_t &plan);
/**
* @brief Removes a channel plan from the system.
*
* @details Removes the whole active channel plan except the 'Default Channels'.
* Please note that this functionality is not available in all regions.
* Information on the allowed ranges is available at the
* LoRaWAN Regional Parameters V1.0.2rB.
*
* @return `lorawan_status_t` The status of the operation. The possible values are:
* \ref LORAWAN_STATUS_OK
* \ref LORAWAN_STATUS_BUSY
* \ref LORAWAN_STATUS_PARAMETER_INVALID
*/
lorawan_status_t remove_channel_plan();
/**
* @brief Access active channel plan.
*
* @details Provides access to the current active channel plan.
*
* @param plan [out] A reference to application provided channel plan data
* structure which will be filled in with active channel
* plan.
*
* @return `lorawan_status_t` The status of the operation. The possible values are:
* \ref LORAWAN_STATUS_OK
* \ref LORAWAN_STATUS_BUSY
* \ref LORAWAN_STATUS_PARAMETER_INVALID
*/
lorawan_status_t get_channel_plan(lorawan_channelplan_t &plan);
/**
* @brief Remove a given channel from the active plan.
*
* @details Deactivates the given channel.
*
* @param id Id of the channel.
*
* @return `lorawan_status_t` The status of the operation. The possible values are:
* \ref LORAWAN_STATUS_OK
* \ref LORAWAN_STATUS_BUSY
* \ref LORAWAN_STATUS_PARAMETER_INVALID
*/
lorawan_status_t remove_single_channel(uint8_t id);
/**
* @brief LoRaMAC multicast channel link service.
*
* @details Links a multicast channel into the linked list.
*
* @param [in] channel_param The multicast channel parameters to link.
*
* @return `lorawan_status_t` The status of the operation. The possible values are:
* \ref LORAWAN_STATUS_OK
* \ref LORAWAN_STATUS_BUSY
* \ref LORAWAN_STATUS_PARAMETER_INVALID
*/
lorawan_status_t multicast_channel_link(multicast_params_t *channel_param);
/**
* @brief LoRaMAC multicast channel unlink service.
*
* @details Unlinks a multicast channel from the linked list.
*
* @param [in] channel_param The multicast channel parameters to unlink.
*
* @return `lorawan_status_t` The status of the operation. The possible values are:
* \ref LORAWAN_STATUS_OK
* \ref LORAWAN_STATUS_BUSY
* \ref LORAWAN_STATUS_PARAMETER_INVALID
*/
lorawan_status_t multicast_channel_unlink(multicast_params_t *channel_param);
/** Binds phy layer to MAC.
*
* @param phy LoRaPHY object
*/
void bind_phy(LoRaPHY &phy);
/**
* @brief Schedules the frame for sending.
*
* @details Prepares a full MAC frame and schedules it for physical
* transmission.
*
* @param [in] mac_hdr MAC frame header field
* @param [in] fport Payload port
* @param [in] fbuffer MAC frame data buffer to be sent
* @param [in] fbuffer_size MAC frame data buffer size
*
* @return status Status of the operation. LORAWAN_STATUS_OK in case
* of success and a negative error code in case of
* failure.
*/
lorawan_status_t send(loramac_mhdr_t *mac_hdr, const uint8_t fport,
const void *fbuffer, uint16_t fbuffer_size);
/**
* @brief get_default_tx_datarate Gets the default TX datarate
* @return default TX datarate.
*/
uint8_t get_default_tx_datarate();
/**
* @brief enable_adaptive_datarate Enables or disables adaptive datarate.
* @param adr_enabled Flag indicating is adr enabled or disabled.
*/
void enable_adaptive_datarate(bool adr_enabled);
/** Sets up the data rate.
*
* `set_datarate()` first verifies whether the data rate given is valid or not.
* If it is valid, the system sets the given data rate to the channel.
*
* @param data_rate The intended data rate, for example DR_0 or DR_1.
* Note that the macro DR_* can mean different
* things in different regions.
*
* @return LORAWAN_STATUS_OK if everything goes well, otherwise
* a negative error code.
*/
lorawan_status_t set_channel_data_rate(uint8_t data_rate);
/**
* @brief tx_ongoing Check whether a prepare is done or not.
* @return True if prepare_ongoing_tx is called, false otherwise.
*/
bool tx_ongoing();
/**
* @brief set_tx_ongoing Changes the ongoing status for prepared message.
* @param ongoing The value indicating the status.
*/
void set_tx_ongoing(bool ongoing);
/**
* @brief reset_ongoing_tx Resets _ongoing_tx_msg.
* @param reset_pending If true resets pending size also.
*/
void reset_ongoing_tx(bool reset_pending = false);
/**
* @brief prepare_ongoing_tx This will prepare (and override) ongoing_tx_msg.
* @param port The application port number.
*
* @param data A pointer to the data being sent. The ownership of the
* buffer is not transferred.
*
* @param length The size of data in bytes.
*
* @param flags A flag used to determine what type of
* message is being sent.
*
* @param num_retries Number of retries for a confirmed type message
*
* @return The number of bytes prepared for sending.
*/
int16_t prepare_ongoing_tx(const uint8_t port, const uint8_t *data,
uint16_t length, uint8_t flags, uint8_t num_retries);
/**
* @brief send_ongoing_tx Sends the ongoing_tx_msg
* @return LORAWAN_STATUS_OK or a negative error code on failure.
*/
lorawan_status_t send_ongoing_tx(void);
/**
* @brief device_class Returns active device class
* @return Device class in use.
*/
device_class_t get_device_class() const;
/**
* @brief set_device_class Sets active device class.
* @param device_class Device class to use.
* @param rx2_would_be_closure_handler callback function to inform about
* would be closure of RX2 window
*/
void set_device_class(const device_class_t &device_class,
mbed::Callback<void(void)>rx2_would_be_closure_handler);
/**
* @brief setup_link_check_request Adds link check request command
* to be put on next outgoing message (when it fits)
*/
void setup_link_check_request();
/**
* @brief prepare_join prepares arguments to be ready for join() call.
* @param params Join parameters to use, if NULL, the default will be used.
* @param is_otaa True if joining is to be done using OTAA, false for ABP.
*
* @return LORAWAN_STATUS_OK or a negative error code on failure.
*/
lorawan_status_t prepare_join(const lorawan_connect_t *params, bool is_otaa);
/**
* @brief join Joins the network.
* @param is_otaa True if joining is to be done using OTAA, false for ABP.
* @return LORAWAN_STATUS_OK or a negative error code on failure.
*/
lorawan_status_t join(bool is_otaa);
/**
* MAC operations upon successful transmission
*/
void on_radio_tx_done(lorawan_time_t timestamp);
/**
* MAC operations upon reception
*/
void on_radio_rx_done(const uint8_t *const payload, uint16_t size,
int16_t rssi, int8_t snr);
/**
* MAC operations upon transmission timeout
*/
void on_radio_tx_timeout(void);
/**
* MAC operations upon empty reception slots
*
* @param is_timeout false when radio encountered an error
* true when the an RX slot went empty
*
* @return current RX slot
*/
void on_radio_rx_timeout(bool is_timeout);
/**
* Handles retransmissions of Join requests if an Accept
* was not received.
*
* @returns true if a retry will be made
*/
bool continue_joining_process(void);
/**
* Checks if the CONFIRMED data can be sent again or not.
*/
bool continue_sending_process(void);
/**
* Read-only access to MAC primitive blocks
*/
const loramac_mcps_confirm_t *get_mcps_confirmation() const;
const loramac_mcps_indication_t *get_mcps_indication() const;
const loramac_mlme_confirm_t *get_mlme_confirmation() const;
const loramac_mlme_indication_t *get_mlme_indication() const;
/**
* Post processing steps in response to actions carried out
* by controller layer and Mac
*/
void post_process_mcps_req(void);
void post_process_mcps_ind(void);
void post_process_mlme_request(void);
void post_process_mlme_ind(void);
/**
* Set battery level query callback
*/
void set_batterylevel_callback(mbed::Callback<uint8_t(void)> battery_level);
/**
* Returns the event ID of backoff timer.
*/
int get_backoff_timer_event_id(void);
/**
* Clears out the TX pipe by discarding any outgoing message if the backoff
* timer is still running.
*/
lorawan_status_t clear_tx_pipe(void);
/**
* Gets the current time
*/
lorawan_time_t get_current_time(void);
/**
* Gets the current receive slot
*/
rx_slot_t get_current_slot(void);
/**
* Indicates what level of QOS is set by network server. QOS level is set
* in response to a LinkADRReq for UNCONFIRMED messages
*/
uint8_t get_QOS_level(void);
/**
*Indicates level of QOS used for the previous outgoing message
*/
uint8_t get_prev_QOS_level(void);
/**
* These locks trample through to the upper layers and make
* the stack thread safe.
*/
#if MBED_CONF_RTOS_PRESENT
void lock(void)
{
_mutex.lock();
}
void unlock(void)
{
_mutex.unlock();
}
#else
void lock(void) { }
void unlock(void) { }
#endif
private:
/**
* @brief Queries the LoRaMAC the maximum possible FRMPayload size to send.
* The LoRaMAC takes the scheduled MAC commands into account and returns
* corresponding value.
*
* @param fopts_len [in] Number of mac commands in the queue pending.
*
* @return Size of the biggest packet that can be sent.
* Please note that if the size of the MAC commands in the queue do
* not fit into the payload size on the related datarate, the LoRaMAC will
* omit the MAC commands.
*/
uint8_t get_max_possible_tx_size(uint8_t fopts_len);
/**
* @brief set_nwk_joined This is used for ABP mode for which real joining does not happen
* @param joined True if device has joined in network, false otherwise
*/
void set_nwk_joined(bool joined);
/**
* @brief Configures the events to trigger an MLME-Indication with
* a MLME type of MLME_SCHEDULE_UPLINK.
*/
void set_mlme_schedule_ul_indication(void);
/**
* @brief Resets MAC specific parameters to default
*/
void reset_mac_parameters(void);
/**
* Handles a Join Accept frame
*/
void handle_join_accept_frame(const uint8_t *payload, uint16_t size);
/**
* Handles data frames
*/
void handle_data_frame(const uint8_t *payload, uint16_t size, uint8_t ptr_pos,
uint8_t msg_type, int16_t rssi, int8_t snr);
/**
* Send a Join Request
*/
lorawan_status_t send_join_request();
/**
* Handles retransmissions
*/
lorawan_status_t handle_retransmission();
/**
* Checks if the frame is valid
*/
void check_frame_size(uint16_t size);
/**
* Performs MIC
*/
bool message_integrity_check(const uint8_t *payload, uint16_t size,
uint8_t *ptr_pos, uint32_t address,
uint32_t *downlink_counter, const uint8_t *nwk_skey);
/**
* Decrypts and extracts data and MAC commands from the received encrypted
* payload
*/
void extract_data_and_mac_commands(const uint8_t *payload, uint16_t size,
uint8_t fopts_len, uint8_t *nwk_skey,
uint8_t *app_skey, uint32_t address,
uint32_t downlink_frame_counter,
int16_t rssi, int8_t snr);
/**
* Decrypts and extracts MAC commands from the received encrypted
* payload if there is no data
*/
void extract_mac_commands_only(const uint8_t *payload, int8_t snr, uint8_t fopts_len);
/**
* Callback function to be executed when the DC backoff timer expires
*/
void on_backoff_timer_expiry(void);
/**
* At the end of an RX1 window timer, an RX1 window is opened using this method.
*/
void open_rx1_window(void);
/**
* At the end of an RX2 window timer, an RX2 window is opened using this method.
*/
void open_rx2_window(void);
/**
* A method to retry a CONFIRMED message after a particular time period
* (ACK_TIMEOUT = TIME_IN_MS) if the ack was not received
*/
void on_ack_timeout_timer_event(void);
/*!
* \brief Check if the OnAckTimeoutTimer has do be disabled. If so, the
* function disables it.
*
* \param [in] node_ack_requested Set to true, if the node has requested an ACK
* \param [in] dev_class The device class
* \param [in] ack_received Set to true, if the node has received an ACK
* \param [in] ack_timeout_retries_counter Retries counter for confirmed uplinks
* \param [in] ack_timeout_retries Maximum retries for confirmed uplinks
*/
void check_to_disable_ack_timeout(bool node_ack_requested,
device_class_t dev_class,
bool ack_received,
uint8_t ack_timeout_retries_counter,
uint8_t ack_timeout_retries);
/**
* Validates if the payload fits into the frame, taking the datarate
* into account.
*
* Please Refer to chapter 4.3.2 of the LoRaWAN specification, v1.0.2
*/
bool validate_payload_length(uint16_t length, int8_t datarate, uint8_t fopts_len);
/**
* Prepares MAC frame on the behest of send() API.
*/
lorawan_status_t prepare_frame(loramac_mhdr_t *mac_hdr,
loramac_frame_ctrl_t *fctrl, const uint8_t fport,
const void *fbuffer, uint16_t fbuffer_size);
/**
* Schedules a transmission on the behest of send() API.
*/
lorawan_status_t schedule_tx();
/**
* Calculates the back-off time for the band of a channel.
* Takes in the last used channel id as a parameter.
*/
void calculate_backOff(uint8_t channel_id);
/**
* Hands over the MAC frame to PHY layer.
*/
lorawan_status_t send_frame_on_channel(uint8_t channel);
/**
* Resets MAC primitive blocks
*/
void reset_mcps_confirmation(void);
void reset_mlme_confirmation(void);
void reset_mcps_indication(void);
/**
* @brief set_tx_continuous_wave Puts the system in continuous transmission mode
* @param [in] channel A Channel to use
* @param [in] datarate A datarate to use
* @param [in] tx_power A RF output power to use
* @param [in] max_eirp A maximum possible EIRP to use
* @param [in] antenna_gain Antenna gain to use
* @param [in] timeout Time in seconds while the radio is kept in continuous wave mode
*/
void set_tx_continuous_wave(uint8_t channel, int8_t datarate, int8_t tx_power,
float max_eirp, float antenna_gain, uint16_t timeout);
private:
typedef mbed::ScopedLock<LoRaMac> Lock;
#if MBED_CONF_RTOS_PRESENT
rtos::Mutex _mutex;
#endif
/**
* Timer subsystem handle
*/
LoRaWANTimeHandler _lora_time;
/**
* LoRa PHY layer object storage
*/
LoRaPHY *_lora_phy;
/**
* MAC command handle
*/
LoRaMacCommand _mac_commands;
/**
* Channel planning subsystem
*/
LoRaMacChannelPlan _channel_plan;
/**
* Crypto handling subsystem
*/
LoRaMacCrypto _lora_crypto;
/**
* Central MAC layer data storage
*/
loramac_protocol_params _params;
/**
* EventQueue object storage
*/
events::EventQueue *_ev_queue;
/**
* Class C doesn't timeout in RX2 window as it is a continuous window.
* We use this callback to inform the LoRaWANStack controller that we did
* not receive a downlink in a time equal to normal Class A type RX2
* window timeout. This marks a 'would-be' closure for RX2, actual RX2 is
* not closed. Mostly network servers will send right at the beginning of
* RX2 window if they have something to send. So if we didn't receive anything
* in the time period equal to would be RX2 delay (which is a function of
* uplink message length and data rate), we will invoke this callback to let
* the upper layer know.
*/
mbed::Callback<void(void)> _rx2_would_be_closure_for_class_c;
/**
* Transmission is async, i.e., a call to schedule_tx() may be deferred to
* a time after a certain back off. We use this callback to inform the
* controller layer that a specific TX transaction failed to schedule after
* backoff or retry.
*/
mbed::Callback<void(void)> _scheduling_failure_handler;
timer_event_t _rx2_closure_timer_for_class_c;
/**
* Structure to hold MCPS indication data.
*/
loramac_mcps_indication_t _mcps_indication;
/**
* Structure to hold MCPS confirm data.
*/
loramac_mcps_confirm_t _mcps_confirmation;
/**
* Structure to hold MLME indication data.
*/
loramac_mlme_indication_t _mlme_indication;
/**
* Structure to hold MLME confirm data.
*/
loramac_mlme_confirm_t _mlme_confirmation;
loramac_tx_message_t _ongoing_tx_msg;
bool _is_nwk_joined;
bool _can_cancel_tx;
bool _continuous_rx2_window_open;
device_class_t _device_class;
uint8_t _prev_qos_level;
bool _demod_ongoing;
};
#endif // MBED_LORAWAN_MAC_H__
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