main.cpp

/**
 * 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.
 */
#include <stdio.h>
#include "lorawan/LoRaWANInterface.h"
#include "lorawan/system/lorawan_data_structures.h"
#include "events/EventQueue.h"

// Application helpers
#include "DummySensor.h"
#include "trace_helper.h"
#include "lora_radio_helper.h"

using namespace events;

uint8_t tx_buffer[LORAMAC_PHY_MAXPAYLOAD];
uint8_t rx_buffer[LORAMAC_PHY_MAXPAYLOAD];

/**
 * Check if duty cycling is on or not
 */
#if LORAWAN_DUTYCYCLE_ON
static bool duty_cycle_on = true;
#else
static bool duty_cycle_on = false;
#endif

/**
 * Maximum number of events for the event queue.
 * 16 is the safe number for the stack events, however, if application
 * also uses the queue for whatever purposes, this number should be increased.
 */
#define MAX_NUMBER_OF_EVENTS    16

/**
 * Maximum number of retries for CONFIRMED messages before giving up
 */
#define CONFIRMED_MSG_RETRY_COUNTER    3

/**
 * Dummy pin for dummy sensor
 */
#define PC_9 0

/**
 * Dummy sensor class object
 */
DS1820  ds1820(PC_9);

/**
* This event queue is the global event queue for both the
* application and stack. To conserve memory, the stack is designed to run
* in the same thread as the application and the application is responsible for
* providing an event queue to the stack that will be used for ISR deferment as
* well as application information event queuing.
*/
static EventQueue ev_queue(MAX_NUMBER_OF_EVENTS * EVENTS_EVENT_SIZE);

/**
 * Event handler.
 *
 * This will be passed to the LoRaWAN stack to queue events for the
 * application which in turn drive the application.
 */
static void lora_event_handler(lora_events_t event);

/**
 * Constructing Mbed LoRaWANInterface and passing it down the radio object.
 */
static LoRaWANInterface lorawan(get_lora_radio());

/**
 * Application specific callbacks
 */
static lorawan_app_callbacks_t callbacks;

/**
 * Entry point for application
 */
int main (void)
{
    // setup tracing
    setup_trace();

    // stores the status of a call to LoRaWAN protocol
    lora_mac_status_t retcode;

    // Initialize LoRaWAN stack
    if (lorawan.initialize(&ev_queue) != LORA_MAC_STATUS_OK) {
        printf("\r\n LoRa initialization failed! \r\n");
        return -1;
    }

    printf("\r\n Mbed LoRaWANStack initialized \r\n");

    // prepare application callbacks
    callbacks.events = mbed::callback(lora_event_handler);
    lorawan.add_app_callbacks(&callbacks);

    // Set number of retries in case of CONFIRMED messages
    if (lorawan.set_confirmed_msg_retries(CONFIRMED_MSG_RETRY_COUNTER)
                                          != LORA_MAC_STATUS_OK) {
        printf("\r\n set_confirmed_msg_retries failed! \r\n\r\n");
        return -1;
    }

    printf("\r\n CONFIRMED message retries : %d \r\n",
           CONFIRMED_MSG_RETRY_COUNTER);

    // Enable adaptive data rate
    if (lorawan.enable_adaptive_datarate() != LORA_MAC_STATUS_OK) {
        printf("\r\n enable_adaptive_datarate failed! \r\n");
        return -1;
    }

    printf("\r\n Adaptive data  rate (ADR) - Enabled \r\n");

    retcode = lorawan.connect();

    if (retcode == LORA_MAC_STATUS_OK ||
        retcode == LORA_MAC_STATUS_CONNECT_IN_PROGRESS) {
    } else {
        printf("\r\n Connection error, code = %d \r\n", retcode);
        return -1;
    }

    printf("\r\n Connection - In Progress ...\r\n");

    // make your event queue dispatching events forever
    ev_queue.dispatch_forever();
}

/**
 * Sends a message to the Network Server
 */
static void send_message()
{
    uint16_t packet_len;
    int16_t retcode;
    float sensor_value;

    if (ds1820.begin()) {
        ds1820.startConversion();
        printf("\r\n Dummy Sensor Value = %3.1f \r\n", ds1820.read());
        sensor_value = ds1820.read();
        ds1820.startConversion();
    } else {
        printf("\r\n No sensor found \r\n");
        return;
    }

    packet_len = sprintf((char*) tx_buffer, "Dummy Sensor Value is %3.1f",
                    sensor_value);

    retcode = lorawan.send(LORAWAN_APP_PORT, tx_buffer, packet_len,
                           MSG_CONFIRMED_FLAG);

    if (retcode < 0) {
        retcode == LORA_MAC_STATUS_WOULD_BLOCK ? printf("send - WOULD BLOCK\r\n")
                : printf("\r\n send() - Error code %d \r\n", retcode);
        return;
    }

    printf("\r\n %d bytes scheduled for transmission \r\n", retcode);
    memset(tx_buffer, 0, LORAMAC_PHY_MAXPAYLOAD);
}

/**
 * Receive a message from the Network Server
 */
static void receive_message()
{
    int16_t retcode;
    retcode = lorawan.receive(LORAWAN_APP_PORT, rx_buffer,
                              LORAMAC_PHY_MAXPAYLOAD,
                              MSG_CONFIRMED_FLAG|MSG_UNCONFIRMED_FLAG);

    if (retcode < 0) {
        printf("\r\n receive() - Error code %d \r\n", retcode);
        return;
    }

    printf(" Data:");

    for (uint8_t i = 0; i < retcode; i++) {
        printf("%x", rx_buffer[i]);
    }

    printf("\r\n Data Length: %d\r\n", retcode);

    memset(rx_buffer, 0, LORAMAC_PHY_MAXPAYLOAD);
}

/**
 * Event handler
 */
static void lora_event_handler(lora_events_t event)
{
    switch (event) {
        case CONNECTED:
            printf("\r\n Connection - Successful \r\n");
            if (duty_cycle_on) {
                send_message();
            } else {
                ev_queue.call_every(TX_TIMER, send_message);
            }

            break;
        case DISCONNECTED:
            ev_queue.break_dispatch();
            printf("\r\n Disconnected Successfully \r\n");
            break;
        case TX_DONE:
            printf("\r\n Message Sent to Network Server \r\n");
            if (duty_cycle_on) {
                send_message();
            }
            break;
        case TX_TIMEOUT:
        case TX_ERROR:
        case TX_CRYPTO_ERROR:
        case TX_SCHEDULING_ERROR:
            printf("\r\n Transmission Error - EventCode = %d \r\n", event);
            // try again
            if (duty_cycle_on) {
                send_message();
            }
            break;
        case RX_DONE:
            printf("\r\n Received message from Network Server \r\n");
            receive_message();
            break;
        case RX_TIMEOUT:
        case RX_ERROR:
            printf("\r\n Error in reception - Code = %d \r\n", event);
            break;
        case JOIN_FAILURE:
            printf("\r\n OTAA Failed - Check Keys \r\n");
            break;
        default:
            MBED_ASSERT("Unknown Event");
    }
}

// EOF