Liam Cox / Mbed OS sw_encrypt_loraWAN_implementation

SW encryption

main.cpp@48:b2afcf2d41fb, 2019-03-19 (annotated)

Committer:
liamcox94
Date:
Tue Mar 19 16:06:19 2019 +0000
Revision:
48:b2afcf2d41fb
Parent:
47:b6d132f1079f
Child:
49:3b27f622a798
aes#1

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 0:7037ed05f54f 1 /**
mbed_official 0:7037ed05f54f 2 * Copyright (c) 2017, Arm Limited and affiliates.
mbed_official 0:7037ed05f54f 3 * SPDX-License-Identifier: Apache-2.0
mbed_official 0:7037ed05f54f 4 *
mbed_official 0:7037ed05f54f 5 * Licensed under the Apache License, Version 2.0 (the "License");
mbed_official 0:7037ed05f54f 6 * you may not use this file except in compliance with the License.
mbed_official 0:7037ed05f54f 7 * You may obtain a copy of the License at
mbed_official 0:7037ed05f54f 8 *
mbed_official 0:7037ed05f54f 9 * http://www.apache.org/licenses/LICENSE-2.0
mbed_official 0:7037ed05f54f 10 *
mbed_official 0:7037ed05f54f 11 * Unless required by applicable law or agreed to in writing, software
mbed_official 0:7037ed05f54f 12 * distributed under the License is distributed on an "AS IS" BASIS,
mbed_official 0:7037ed05f54f 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
mbed_official 0:7037ed05f54f 14 * See the License for the specific language governing permissions and
mbed_official 0:7037ed05f54f 15 * limitations under the License.
mbed_official 0:7037ed05f54f 16 */
mbed_official 0:7037ed05f54f 17 #include <stdio.h>
liamcox94 48:b2afcf2d41fb 18 #include <iostream>
mbed_official 3:8c7198d1a2a1 19
mbed_official 0:7037ed05f54f 20 #include "lorawan/LoRaWANInterface.h"
mbed_official 0:7037ed05f54f 21 #include "lorawan/system/lorawan_data_structures.h"
mbed_official 0:7037ed05f54f 22 #include "events/EventQueue.h"
mbed_official 0:7037ed05f54f 23
mbed_official 0:7037ed05f54f 24 // Application helpers
mbed_official 0:7037ed05f54f 25 #include "DummySensor.h"
mbed_official 0:7037ed05f54f 26 #include "trace_helper.h"
mbed_official 0:7037ed05f54f 27 #include "lora_radio_helper.h"
mbed_official 0:7037ed05f54f 28
liamcox94 48:b2afcf2d41fb 29 #include "sha256.h"
liamcox94 48:b2afcf2d41fb 30
mbed_official 0:7037ed05f54f 31 using namespace events;
mbed_official 0:7037ed05f54f 32
mbed_official 12:5015dfead3f2 33 // Max payload size can be LORAMAC_PHY_MAXPAYLOAD.
mbed_official 12:5015dfead3f2 34 // This example only communicates with much shorter messages (<30 bytes).
mbed_official 12:5015dfead3f2 35 // If longer messages are used, these buffers must be changed accordingly.
liamcox94 48:b2afcf2d41fb 36 uint8_t tx_buffer[44];
liamcox94 48:b2afcf2d41fb 37 uint8_t rx_buffer[44];
mbed_official 0:7037ed05f54f 38
mbed_official 0:7037ed05f54f 39 /*
mbed_official 0:7037ed05f54f 40 * Sets up an application dependent transmission timer in ms. Used only when Duty Cycling is off for testing
mbed_official 0:7037ed05f54f 41 */
mbed_official 0:7037ed05f54f 42 #define TX_TIMER 10000
mbed_official 0:7037ed05f54f 43
mbed_official 0:7037ed05f54f 44 /**
mbed_official 0:7037ed05f54f 45 * Maximum number of events for the event queue.
mbed_official 12:5015dfead3f2 46 * 10 is the safe number for the stack events, however, if application
mbed_official 0:7037ed05f54f 47 * also uses the queue for whatever purposes, this number should be increased.
mbed_official 0:7037ed05f54f 48 */
mbed_official 12:5015dfead3f2 49 #define MAX_NUMBER_OF_EVENTS 10
mbed_official 0:7037ed05f54f 50
mbed_official 0:7037ed05f54f 51 /**
mbed_official 0:7037ed05f54f 52 * Maximum number of retries for CONFIRMED messages before giving up
mbed_official 0:7037ed05f54f 53 */
mbed_official 0:7037ed05f54f 54 #define CONFIRMED_MSG_RETRY_COUNTER 3
mbed_official 0:7037ed05f54f 55
mbed_official 0:7037ed05f54f 56 /**
mbed_official 0:7037ed05f54f 57 * Dummy pin for dummy sensor
mbed_official 0:7037ed05f54f 58 */
mbed_official 0:7037ed05f54f 59 #define PC_9 0
mbed_official 0:7037ed05f54f 60
mbed_official 0:7037ed05f54f 61 /**
mbed_official 0:7037ed05f54f 62 * Dummy sensor class object
mbed_official 0:7037ed05f54f 63 */
mbed_official 0:7037ed05f54f 64 DS1820 ds1820(PC_9);
mbed_official 0:7037ed05f54f 65
mbed_official 0:7037ed05f54f 66 /**
mbed_official 0:7037ed05f54f 67 * This event queue is the global event queue for both the
mbed_official 0:7037ed05f54f 68 * application and stack. To conserve memory, the stack is designed to run
mbed_official 0:7037ed05f54f 69 * in the same thread as the application and the application is responsible for
mbed_official 0:7037ed05f54f 70 * providing an event queue to the stack that will be used for ISR deferment as
mbed_official 0:7037ed05f54f 71 * well as application information event queuing.
mbed_official 0:7037ed05f54f 72 */
mbed_official 46:a124538e2891 73 static EventQueue ev_queue(MAX_NUMBER_OF_EVENTS *EVENTS_EVENT_SIZE);
mbed_official 0:7037ed05f54f 74
mbed_official 0:7037ed05f54f 75 /**
mbed_official 0:7037ed05f54f 76 * Event handler.
mbed_official 0:7037ed05f54f 77 *
mbed_official 0:7037ed05f54f 78 * This will be passed to the LoRaWAN stack to queue events for the
mbed_official 0:7037ed05f54f 79 * application which in turn drive the application.
mbed_official 0:7037ed05f54f 80 */
mbed_official 0:7037ed05f54f 81 static void lora_event_handler(lorawan_event_t event);
mbed_official 0:7037ed05f54f 82
mbed_official 0:7037ed05f54f 83 /**
mbed_official 46:a124538e2891 84 * Constructing Mbed LoRaWANInterface and passing it the radio object from lora_radio_helper.
mbed_official 0:7037ed05f54f 85 */
mbed_official 2:dc95ac6d6d4e 86 static LoRaWANInterface lorawan(radio);
mbed_official 0:7037ed05f54f 87
mbed_official 0:7037ed05f54f 88 /**
mbed_official 0:7037ed05f54f 89 * Application specific callbacks
mbed_official 0:7037ed05f54f 90 */
mbed_official 0:7037ed05f54f 91 static lorawan_app_callbacks_t callbacks;
mbed_official 0:7037ed05f54f 92
mbed_official 0:7037ed05f54f 93 /**
mbed_official 0:7037ed05f54f 94 * Entry point for application
mbed_official 0:7037ed05f54f 95 */
mbed_official 46:a124538e2891 96 int main(void)
mbed_official 0:7037ed05f54f 97 {
mbed_official 0:7037ed05f54f 98 // setup tracing
mbed_official 0:7037ed05f54f 99 setup_trace();
mbed_official 0:7037ed05f54f 100
mbed_official 0:7037ed05f54f 101 // stores the status of a call to LoRaWAN protocol
liamcox94 48:b2afcf2d41fb 102 lorawan_status_t loraStatus;
mbed_official 0:7037ed05f54f 103
mbed_official 0:7037ed05f54f 104 // Initialize LoRaWAN stack
mbed_official 2:dc95ac6d6d4e 105 if (lorawan.initialize(&ev_queue) != LORAWAN_STATUS_OK) {
mbed_official 0:7037ed05f54f 106 printf("\r\n LoRa initialization failed! \r\n");
mbed_official 0:7037ed05f54f 107 return -1;
mbed_official 0:7037ed05f54f 108 }
mbed_official 0:7037ed05f54f 109
mbed_official 0:7037ed05f54f 110 printf("\r\n Mbed LoRaWANStack initialized \r\n");
mbed_official 0:7037ed05f54f 111
mbed_official 0:7037ed05f54f 112 // prepare application callbacks
mbed_official 0:7037ed05f54f 113 callbacks.events = mbed::callback(lora_event_handler);
mbed_official 2:dc95ac6d6d4e 114 lorawan.add_app_callbacks(&callbacks);
mbed_official 0:7037ed05f54f 115
mbed_official 0:7037ed05f54f 116 // Set number of retries in case of CONFIRMED messages
mbed_official 2:dc95ac6d6d4e 117 if (lorawan.set_confirmed_msg_retries(CONFIRMED_MSG_RETRY_COUNTER)
mbed_official 46:a124538e2891 118 != LORAWAN_STATUS_OK) {
mbed_official 0:7037ed05f54f 119 printf("\r\n set_confirmed_msg_retries failed! \r\n\r\n");
mbed_official 0:7037ed05f54f 120 return -1;
mbed_official 0:7037ed05f54f 121 }
mbed_official 0:7037ed05f54f 122
mbed_official 0:7037ed05f54f 123 printf("\r\n CONFIRMED message retries : %d \r\n",
mbed_official 0:7037ed05f54f 124 CONFIRMED_MSG_RETRY_COUNTER);
mbed_official 0:7037ed05f54f 125
mbed_official 0:7037ed05f54f 126 // Enable adaptive data rate
mbed_official 2:dc95ac6d6d4e 127 if (lorawan.enable_adaptive_datarate() != LORAWAN_STATUS_OK) {
mbed_official 0:7037ed05f54f 128 printf("\r\n enable_adaptive_datarate failed! \r\n");
mbed_official 0:7037ed05f54f 129 return -1;
mbed_official 0:7037ed05f54f 130 }
mbed_official 0:7037ed05f54f 131
mbed_official 0:7037ed05f54f 132 printf("\r\n Adaptive data rate (ADR) - Enabled \r\n");
mbed_official 0:7037ed05f54f 133
liamcox94 48:b2afcf2d41fb 134 loraStatus = lorawan.connect();
mbed_official 0:7037ed05f54f 135
liamcox94 48:b2afcf2d41fb 136 if (loraStatus == LORAWAN_STATUS_OK ||
liamcox94 48:b2afcf2d41fb 137 loraStatus == LORAWAN_STATUS_CONNECT_IN_PROGRESS) {
mbed_official 0:7037ed05f54f 138 } else {
liamcox94 48:b2afcf2d41fb 139 printf("\r\n Connection error, code = %d \r\n", loraStatus);
mbed_official 0:7037ed05f54f 140 return -1;
mbed_official 0:7037ed05f54f 141 }
mbed_official 0:7037ed05f54f 142 printf("\r\n Connection - In Progress ...\r\n");
mbed_official 0:7037ed05f54f 143
mbed_official 0:7037ed05f54f 144 // make your event queue dispatching events forever
mbed_official 0:7037ed05f54f 145 ev_queue.dispatch_forever();
mbed_official 3:8c7198d1a2a1 146
mbed_official 3:8c7198d1a2a1 147 return 0;
mbed_official 0:7037ed05f54f 148 }
mbed_official 0:7037ed05f54f 149
mbed_official 0:7037ed05f54f 150 /**
mbed_official 0:7037ed05f54f 151 * Sends a message to the Network Server
mbed_official 0:7037ed05f54f 152 */
liamcox94 48:b2afcf2d41fb 153 static void send_message() {
liamcox94 48:b2afcf2d41fb 154 uint16_t packet_cont;
liamcox94 48:b2afcf2d41fb 155 int16_t loraStatus;
liamcox94 48:b2afcf2d41fb 156 /*****************************************************************************************************/
liamcox94 48:b2afcf2d41fb 157
liamcox94 48:b2afcf2d41fb 158 uint8_t hash_content = 77;
liamcox94 48:b2afcf2d41fb 159 char hash_str[] = "";
liamcox94 48:b2afcf2d41fb 160 sprintf(hash_str, "%d", hash_content);
mbed_official 0:7037ed05f54f 161
liamcox94 48:b2afcf2d41fb 162 static const unsigned char * hash_buffer = (const unsigned char * ) hash_str;
liamcox94 48:b2afcf2d41fb 163 static const size_t hash_len = strlen(hash_str);
liamcox94 48:b2afcf2d41fb 164 unsigned char output[32];
mbed_official 0:7037ed05f54f 165
liamcox94 48:b2afcf2d41fb 166 mbedtls_sha256(hash_buffer, hash_len, output, 0);
liamcox94 48:b2afcf2d41fb 167
liamcox94 48:b2afcf2d41fb 168 const char * c = (const char * ) output;
liamcox94 48:b2afcf2d41fb 169
liamcox94 48:b2afcf2d41fb 170 /*****************************************************************************************************/
mbed_official 0:7037ed05f54f 171
liamcox94 48:b2afcf2d41fb 172 packet_cont = sprintf((char * ) tx_buffer, c);
mbed_official 0:7037ed05f54f 173
liamcox94 48:b2afcf2d41fb 174 loraStatus = lorawan.send(MBED_CONF_LORA_APP_PORT, tx_buffer, packet_cont,
liamcox94 48:b2afcf2d41fb 175 MSG_UNCONFIRMED_FLAG);
liamcox94 48:b2afcf2d41fb 176
liamcox94 48:b2afcf2d41fb 177 if (loraStatus < 0) {
liamcox94 48:b2afcf2d41fb 178 loraStatus == LORAWAN_STATUS_WOULD_BLOCK ? printf("send - WOULD BLOCK\r\n") :
liamcox94 48:b2afcf2d41fb 179 printf("\r\n send() - Error code %d \r\n", loraStatus);
mbed_official 26:f07f5febf97f 180
liamcox94 48:b2afcf2d41fb 181 if (loraStatus == LORAWAN_STATUS_WOULD_BLOCK) {
liamcox94 48:b2afcf2d41fb 182 //retry in 3 seconds
liamcox94 48:b2afcf2d41fb 183 if (MBED_CONF_LORA_DUTY_CYCLE_ON) {
liamcox94 48:b2afcf2d41fb 184 ev_queue.call_in(3000, send_message);
liamcox94 48:b2afcf2d41fb 185 }
mbed_official 0:7037ed05f54f 186 }
liamcox94 48:b2afcf2d41fb 187 return;
liamcox94 48:b2afcf2d41fb 188 }
mbed_official 0:7037ed05f54f 189
liamcox94 48:b2afcf2d41fb 190 printf("\r\n %d bytes scheduled for transmission \r\n", loraStatus);
liamcox94 48:b2afcf2d41fb 191 memset(tx_buffer, 0, sizeof(tx_buffer));
mbed_official 0:7037ed05f54f 192 }
mbed_official 0:7037ed05f54f 193 /**
mbed_official 0:7037ed05f54f 194 * Receive a message from the Network Server
mbed_official 0:7037ed05f54f 195 */
mbed_official 0:7037ed05f54f 196 static void receive_message()
mbed_official 0:7037ed05f54f 197 {
mbed_official 47:b6d132f1079f 198 uint8_t port;
mbed_official 47:b6d132f1079f 199 int flags;
mbed_official 47:b6d132f1079f 200 int16_t retcode = lorawan.receive(rx_buffer, sizeof(rx_buffer), port, flags);
mbed_official 0:7037ed05f54f 201
mbed_official 0:7037ed05f54f 202 if (retcode < 0) {
mbed_official 0:7037ed05f54f 203 printf("\r\n receive() - Error code %d \r\n", retcode);
mbed_official 0:7037ed05f54f 204 return;
mbed_official 0:7037ed05f54f 205 }
mbed_official 0:7037ed05f54f 206
mbed_official 47:b6d132f1079f 207 printf(" RX Data on port %u (%d bytes): ", port, retcode);
mbed_official 0:7037ed05f54f 208 for (uint8_t i = 0; i < retcode; i++) {
mbed_official 47:b6d132f1079f 209 printf("%02x ", rx_buffer[i]);
mbed_official 0:7037ed05f54f 210 }
mbed_official 47:b6d132f1079f 211 printf("\r\n");
mbed_official 47:b6d132f1079f 212
mbed_official 12:5015dfead3f2 213 memset(rx_buffer, 0, sizeof(rx_buffer));
mbed_official 0:7037ed05f54f 214 }
mbed_official 0:7037ed05f54f 215
mbed_official 0:7037ed05f54f 216 /**
mbed_official 0:7037ed05f54f 217 * Event handler
mbed_official 0:7037ed05f54f 218 */
mbed_official 0:7037ed05f54f 219 static void lora_event_handler(lorawan_event_t event)
mbed_official 0:7037ed05f54f 220 {
mbed_official 0:7037ed05f54f 221 switch (event) {
mbed_official 0:7037ed05f54f 222 case CONNECTED:
mbed_official 0:7037ed05f54f 223 printf("\r\n Connection - Successful \r\n");
mbed_official 0:7037ed05f54f 224 if (MBED_CONF_LORA_DUTY_CYCLE_ON) {
mbed_official 0:7037ed05f54f 225 send_message();
mbed_official 0:7037ed05f54f 226 } else {
mbed_official 0:7037ed05f54f 227 ev_queue.call_every(TX_TIMER, send_message);
mbed_official 0:7037ed05f54f 228 }
mbed_official 0:7037ed05f54f 229
mbed_official 0:7037ed05f54f 230 break;
mbed_official 0:7037ed05f54f 231 case DISCONNECTED:
mbed_official 0:7037ed05f54f 232 ev_queue.break_dispatch();
mbed_official 0:7037ed05f54f 233 printf("\r\n Disconnected Successfully \r\n");
mbed_official 0:7037ed05f54f 234 break;
mbed_official 0:7037ed05f54f 235 case TX_DONE:
mbed_official 0:7037ed05f54f 236 printf("\r\n Message Sent to Network Server \r\n");
mbed_official 0:7037ed05f54f 237 if (MBED_CONF_LORA_DUTY_CYCLE_ON) {
mbed_official 0:7037ed05f54f 238 send_message();
mbed_official 0:7037ed05f54f 239 }
mbed_official 0:7037ed05f54f 240 break;
mbed_official 0:7037ed05f54f 241 case TX_TIMEOUT:
mbed_official 0:7037ed05f54f 242 case TX_ERROR:
mbed_official 0:7037ed05f54f 243 case TX_CRYPTO_ERROR:
mbed_official 0:7037ed05f54f 244 case TX_SCHEDULING_ERROR:
mbed_official 0:7037ed05f54f 245 printf("\r\n Transmission Error - EventCode = %d \r\n", event);
mbed_official 0:7037ed05f54f 246 // try again
mbed_official 0:7037ed05f54f 247 if (MBED_CONF_LORA_DUTY_CYCLE_ON) {
mbed_official 0:7037ed05f54f 248 send_message();
mbed_official 0:7037ed05f54f 249 }
mbed_official 0:7037ed05f54f 250 break;
mbed_official 0:7037ed05f54f 251 case RX_DONE:
mbed_official 0:7037ed05f54f 252 printf("\r\n Received message from Network Server \r\n");
mbed_official 0:7037ed05f54f 253 receive_message();
mbed_official 0:7037ed05f54f 254 break;
mbed_official 0:7037ed05f54f 255 case RX_TIMEOUT:
mbed_official 0:7037ed05f54f 256 case RX_ERROR:
mbed_official 0:7037ed05f54f 257 printf("\r\n Error in reception - Code = %d \r\n", event);
mbed_official 0:7037ed05f54f 258 break;
mbed_official 0:7037ed05f54f 259 case JOIN_FAILURE:
mbed_official 0:7037ed05f54f 260 printf("\r\n OTAA Failed - Check Keys \r\n");
mbed_official 0:7037ed05f54f 261 break;
mbed_official 26:f07f5febf97f 262 case UPLINK_REQUIRED:
mbed_official 26:f07f5febf97f 263 printf("\r\n Uplink required by NS \r\n");
mbed_official 26:f07f5febf97f 264 if (MBED_CONF_LORA_DUTY_CYCLE_ON) {
mbed_official 26:f07f5febf97f 265 send_message();
mbed_official 26:f07f5febf97f 266 }
mbed_official 26:f07f5febf97f 267 break;
mbed_official 0:7037ed05f54f 268 default:
mbed_official 0:7037ed05f54f 269 MBED_ASSERT("Unknown Event");
mbed_official 0:7037ed05f54f 270 }
mbed_official 0:7037ed05f54f 271 }
mbed_official 0:7037ed05f54f 272
liamcox94 48:b2afcf2d41fb 273 // EOF