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mbed-os/features/lorawan/LoRaWANInterface.h

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/**
* Copyright (c) 2017, Arm Limited and affiliates.
* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef LORAWANINTERFACE_H_
#define LORAWANINTERFACE_H_
#include "platform/Callback.h"
#include "lorawan/LoRaWANStack.h"
#include "lorawan/LoRaRadio.h"
#include "lorawan/LoRaWANBase.h"
class LoRaWANInterface: public LoRaWANBase {
public:
/** Constructs a LoRaWANInterface using the LoRaWANStack instance underneath.
*
* Currently, LoRaWANStack is a singleton and you should only
* construct a single instance of LoRaWANInterface.
*
*/
LoRaWANInterface(LoRaRadio& radio);
virtual ~LoRaWANInterface();
/** Initialize the LoRa stack.
*
* You must call this first to be able to use the LoRa stack.
*
* @param ev_queue A pointer to EventQueue provided by the application.
*
* @return 0 on success, a negative error code on failure.
*/
virtual lorawan_status_t initialize(events::EventQueue *ev_queue) ;
/** Connect OTAA or ABP using Mbed-OS config system
*
* Connect by Over The Air Activation or Activation By Personalization.
* You need to configure the connection properly via the Mbed OS configuration
* system.
*
* When connecting via OTAA, the return code for success (LORAWAN_STATUS_CONNECT_IN_PROGRESS) is negative.
* However, this is not a real error. It tells you that the connection is in progress and you will
* be notified of the completion via an event. By default, after the Join Accept message
* is received, base stations may provide the node with a CF-List that replaces
* all user-configured channels except the Join/Default channels. A CF-List can
* configure a maximum of five channels other than the default channels.
*
* In case of ABP, the CONNECTED event is posted before the call to `connect()` returns.
* To configure more channels, we recommend that you use the `set_channel_plan()` API after the connection.
* By default, the PHY layers configure only the mandatory Join channels. The retransmission back-off restrictions
* on these channels are severe and you may experience long delays or even failures in the confirmed traffic.
* If you add more channels, the aggregated duty cycle becomes much more relaxed as compared to the Join (default) channels only.
*
* **NOTES ON RECONNECTION:**
* Currently, the Mbed OS LoRaWAN implementation does not support non-volatile
* memory storage. Therefore, the state and frame counters cannot be restored after
* a power cycle. However, if you use the `disconnect()` API to shut down the LoRaWAN
* protocol, the state and frame counters are saved. Connecting again would try to
* restore the previous session. According to the LoRaWAN 1.0.2 specification, the frame counters are always reset
* to zero for OTAA and a new Join request lets the network server know
* that the counters need a reset. The same is said about the ABP but there
* is no way to convey this information to the network server. For a network
* server, an ABP device is always connected. That's why storing the frame counters
* is important, at least for ABP. That's why we try to restore frame counters from
* session information after a disconnection.
*
* @return LORAWAN_STATUS_OK or LORAWAN_STATUS_CONNECT_IN_PROGRESS
* on success, or a negative error code on failure.
*/
virtual lorawan_status_t connect();
/** Connect OTAA or ABP with parameters
*
* All connection parameters are chosen by the user and provided in the
* data structure passed down.
*
* When connecting via OTAA, the return code for success (LORAWAN_STATUS_CONNECT_IN_PROGRESS) is negative.
* However, this is not a real error. It tells you that connection is in progress and you will
* be notified of completion via an event. By default, after Join Accept message
* is received, base stations may provide the node with a CF-List which replaces
* all user-configured channels except the Join/Default channels. A CF-List can
* configure a maximum of five channels other than the default channels.
*
* In case of ABP, the CONNECTED event is posted before the call to `connect()` returns.
* To configure more channels, we recommend that you use the `set_channel_plan()` API after the connection.
* By default, the PHY layers configure only the mandatory Join
* channels. The retransmission back-off restrictions on these channels
* are severe and you may experience long delays or even
* failures in the confirmed traffic. If you add more channels, the aggregated duty
* cycle becomes much more relaxed as compared to the Join (default) channels only.
*
* **NOTES ON RECONNECTION:**
* Currently, the Mbed OS LoRaWAN implementation does not support non-volatile
* memory storage. Therefore, the state and frame counters cannot be restored after
* a power cycle. However, if you use the `disconnect()` API to shut down the LoRaWAN
* protocol, the state and frame counters are saved. Connecting again would try to
* restore the previous session. According to the LoRaWAN 1.0.2 specification, the frame counters are always reset
* to zero for OTAA and a new Join request lets the network server know
* that the counters need a reset. The same is said about the ABP but there
* is no way to convey this information to the network server. For a network
* server, an ABP device is always connected. That's why storing the frame counters
* is important, at least for ABP. That's why we try to restore frame counters from
* session information after a disconnection.
*
* @param connect Options for an end device connection to the gateway.
*
* @return LORAWAN_STATUS_OK or LORAWAN_STATUS_CONNECT_IN_PROGRESS,
* a negative error code on failure.
*/
virtual lorawan_status_t connect(const lorawan_connect_t &connect);
/** Disconnect the current session.
*
* @return LORAWAN_STATUS_DEVICE_OFF on successfully shutdown.
*/
virtual lorawan_status_t disconnect();
/** Validate the connectivity with the network.
*
* Application may use this API to submit a request to the stack for
* validation of its connectivity to a Network Server. Under the hood, this
* API schedules a Link Check Request command (LinkCheckReq) for the network
* server and once the response, i.e., LinkCheckAns MAC command is received
* from the Network Server, user provided method is called.
*
* One way to use this API may be the validation of connectivity after a long
* deep sleep. Mbed LoRaWANStack piggy-backs the MAC commands with data
* frame payload so the application needs to try sending something and the Network
* Server may respond during the RX slots.
*
* This API is usable only when the 'link_check_resp' callback is set by
* the application. See add_lora_app_callbacks API. If the above mentioned
* callback is not set, a LORAWAN_STATUS_PARAMETER_INVALID error is thrown.
*
* First parameter to callback function is the demodulation margin and
* the second parameter is the number of gateways that successfully received
* the last request.
*
* A 'Link Check Request' MAC command remains set for every subsequent
* transmission, until/unless application explicitly turns it off using
* remove_link_check_request() API.
*
* @return LORAWAN_STATUS_OK on successfully queuing a request, or
* a negative error code on failure.
*
*/
virtual lorawan_status_t add_link_check_request();
/** Removes link check request sticky MAC command.
*
* Any already queued request may still get entertained. However, no new
* requests will be made.
*/
virtual void remove_link_check_request();
/** Sets up a particular 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.
* Please 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.
*/
virtual lorawan_status_t set_datarate(uint8_t data_rate);
/** Enables adaptive data rate (ADR).
*
* The underlying LoRaPHY and LoRaMac layers handle the data rate automatically
* for the user, based upon the radio conditions (network congestion).
*
* @return LORAWAN_STATUS_OK or negative error code otherwise.
*/
virtual lorawan_status_t enable_adaptive_datarate();
/** Disables adaptive data rate.
*
* When adaptive data rate (ADR) is disabled, you can either set a certain
* data rate or the MAC layer selects a default value.
*
* @return LORAWAN_STATUS_OK or negative error code otherwise.
*/
virtual lorawan_status_t disable_adaptive_datarate();
/** Sets up the retry counter for confirmed messages.
*
* Valid for confirmed messages only.
*
* The number of trials to transmit the frame, if the LoRaMAC layer did not
* receive an acknowledgment. The MAC performs a data rate adaptation as in
* the LoRaWAN Specification V1.0.2, chapter 18.4, table on page 64.
*
* Note, that if number of retries is set to 1 or 2, MAC will not decrease
* the datarate, if the LoRaMAC layer did not receive an acknowledgment.
*
* @param count The number of retries for confirmed messages.
*
* @return LORAWAN_STATUS_OK or a negative error code.
*/
virtual lorawan_status_t set_confirmed_msg_retries(uint8_t count);
/** Sets the channel plan.
*
* You can provide a list of channels with appropriate parameters filled
* in. However, this list is not absolute. The stack applies a CF-List whenever
* available, which means that the network can overwrite your channel
* frequency settings right after Join Accept is received. You may try
* to set up any channel or channels after that, and if the channel requested
* is already active, the request is silently ignored. A negative error
* code is returned if there is any problem with parameters.
*
* Please note that this API can also be used to add a single channel to the
* existing channel plan.
*
* There is no reverse mechanism in the 1.0.2 specification for a node to request
* a particular channel. Only the network server can initiate such a request.
* You need to ensure that the corresponding base station supports the channel or channels being added.
*
* If your list includes a default channel (a channel where Join Requests
* are received) you cannot fully configure the channel parameters.
* Either leave the channel settings to default or check your
* corresponding PHY layer implementation. For example, LoRaPHYE868.
*
* @param channel_plan The channel plan to set.
*
* @return LORAWAN_STATUS_OK on success, a negative error
* code on failure.
*/
virtual lorawan_status_t set_channel_plan(const lorawan_channelplan_t &channel_plan);
/** Gets the channel plans from the LoRa stack.
*
* Once you have selected a particular PHY layer, a set of channels
* is automatically activated. Right after connecting, you can use this API
* to see the current plan. Otherwise, this API returns the channel
* plan that you have set using `set_channel_plan()`.
*
* @param channel_plan The current channel plan information.
*
* @return LORAWAN_STATUS_OK on success, a negative error
* code on failure.
*/
virtual lorawan_status_t get_channel_plan(lorawan_channelplan_t &channel_plan);
/** Removes an active channel plan.
*
* You cannot remove default channels (the channels the base stations are listening to).
* When a plan is abolished, only the non-default channels are removed.
*
* @return LORAWAN_STATUS_OK on success, a negative error
* code on failure.
*/
virtual lorawan_status_t remove_channel_plan();
/** Removes a single channel.
*
* You cannot remove default channels (the channels the base stations are listening to).
*
* @param index The channel index.
*
* @return LORAWAN_STATUS_OK on success, a negative error
* code on failure.
*/
virtual lorawan_status_t remove_channel(uint8_t index);
/** Send message to gateway
*
* @param port The application port number. Port numbers 0 and 224
* are reserved, whereas port numbers from 1 to 223
* (0x01 to 0xDF) are valid port numbers.
* Anything out of this range is illegal.
*
* @param data A pointer to the data being sent. The ownership of the
* buffer is not transferred. The data is copied to the
* internal buffers.
*
* @param length The size of data in bytes.
*
* @param flags A flag used to determine what type of
* message is being sent, for example:
*
* MSG_UNCONFIRMED_FLAG = 0x01
* MSG_CONFIRMED_FLAG = 0x02
* MSG_MULTICAST_FLAG = 0x04
* MSG_PROPRIETARY_FLAG = 0x08
* MSG_MULTICAST_FLAG and MSG_PROPRIETARY_FLAG can be
* used in conjunction with MSG_UNCONFIRMED_FLAG and
* MSG_CONFIRMED_FLAG depending on the intended use.
*
* MSG_PROPRIETARY_FLAG|MSG_CONFIRMED_FLAG mask will set
* a confirmed message flag for a proprietary message.
* MSG_CONFIRMED_FLAG and MSG_UNCONFIRMED_FLAG are
* mutually exclusive.
*
*
* @return The number of bytes sent, or
* LORAWAN_STATUS_WOULD_BLOCK if another TX is
* ongoing, or a negative error code on failure.
*/
virtual int16_t send(uint8_t port, const uint8_t* data, uint16_t length,
int flags);
/** Receives a message from the Network Server.
*
* @param port The application port number. Port numbers 0 and 224
* are reserved, whereas port numbers from 1 to 223
* (0x01 to 0xDF) are valid port numbers.
* Anything out of this range is illegal.
*
* @param data A pointer to buffer where the received data will be
* stored.
*
* @param length The size of data in bytes
*
* @param flags A flag is used to determine what type of
* message is being sent, for example:
*
* MSG_UNCONFIRMED_FLAG = 0x01,
* MSG_CONFIRMED_FLAG = 0x02
* MSG_MULTICAST_FLAG = 0x04,
* MSG_PROPRIETARY_FLAG = 0x08
*
* MSG_MULTICAST_FLAG and MSG_PROPRIETARY_FLAG can be
* used in conjunction with MSG_UNCONFIRMED_FLAG and
* MSG_CONFIRMED_FLAG depending on the intended use.
*
* MSG_PROPRIETARY_FLAG|MSG_CONFIRMED_FLAG mask will set
* a confirmed message flag for a proprietary message.
*
* MSG_CONFIRMED_FLAG and MSG_UNCONFIRMED_FLAG are
* not mutually exclusive, i.e., the user can subscribe to
* receive both CONFIRMED AND UNCONFIRMED messages at
* the same time.
*
* @return It could be one of these:
* i) 0 if there is nothing else to read.
* ii) Number of bytes written to user buffer.
* iii) LORAWAN_STATUS_WOULD_BLOCK if there is
* nothing available to read at the moment.
* iv) A negative error code on failure.
*/
virtual int16_t receive(uint8_t port, uint8_t* data, uint16_t length,
int flags);
/** Add application callbacks to the stack.
*
* 'lorawan_app_callbacks' is a structure that holds pointers to the application
* provided methods which are needed to be called in response to certain
* requests. The structure is default constructed to set all pointers to NULL.
* So if the user does not provide the pointer, a response will not be posted.
* However, the 'lorawan_events' callback is mandatory to be provided as it
* contains essential events.
*
* Events that can be posted to user via 'lorawan_events' are:
*
* CONNECTED - When the connection is complete
* DISCONNECTED - When the protocol is shut down in response to disconnect()
* TX_DONE - When a packet is sent
* TX_TIMEOUT, - When stack was unable to send packet in TX window
* TX_ERROR, - A general TX error
* TX_CRYPTO_ERROR, - If MIC fails, or any other crypto relted error
* TX_SCHEDULING_ERROR, - When stack is unable to schedule packet
* RX_DONE, - When there is something to receive
* RX_TIMEOUT, - Not yet mapped
* RX_ERROR - A general RX error
*
* Other responses to certain standard requests are an item for the future.
* For example, a link check request could be sent whenever the device tries
* to send a message and if the network server responds with a link check resposne,
* the stack notifies the application be calling the appropriate method. For example,
* 'link_check_resp' callback could be used to collect a response for a link check
* request MAC command and the result is thus transported to the application
* via callback function provided.
*
* As can be seen from declaration, mbed::Callback<void(uint8_t, uint8_t)> *link_check_resp)
* carries two parameters. First one is Demodulation Margin and the second one
* is number of gateways involved in the path to network server.
*
* An example of using this API with a latch onto 'lorawan_events' could be:
*
* LoRaWANInterface lorawan(radio);
* lorawan_app_callbacks cbs;
* static void my_event_handler();
*
* int main()
* {
* lorawan.initialize(&queue);
* cbs.events = mbed::callback(my_event_handler);
* lorawan.add_app_callbacks(&cbs);
* lorawan.connect();
* }
*
* static void my_event_handler(lora_events_t events)
* {
* switch(events) {
* case CONNECTED:
* //do something
* break;
* case DISCONNECTED:
* //do something
* break;
* case TX_DONE:
* //do something
* break;
* default:
* break;
* }
* }
*
* @param callbacks A pointer to the structure containing application
* callbacks.
*/
virtual lorawan_status_t add_app_callbacks(lorawan_app_callbacks_t *callbacks);
private:
bool _link_check_requested;
};
#endif /* LORAWANINTERFACE_H_ */
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