Liam Cox
/
sw_encrypt_loraWAN_implementation
SW encryption
main.cpp
- Committer:
- liamcox94
- Date:
- 2019-04-30
- Revision:
- 49:3b27f622a798
- Parent:
- 48:b2afcf2d41fb
File content as of revision 49:3b27f622a798:
#include <stdio.h> #include <iostream> #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" #include "sha256.h" using namespace events; // Max payload size can be LORAMAC_PHY_MAXPAYLOAD. // This example only communicates with much shorter messages (<30 bytes). // If longer messages are used, these buffers must be changed accordingly. uint8_t tx_buffer[128]; uint8_t rx_buffer[128]; /* * Sets up an application dependent transmission timer in ms. Used only when Duty Cycling is off for testing */ #define TX_TIMER 10000 /** * Maximum number of events for the event queue. * 10 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 10 /** * 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(lorawan_event_t event); /** * Constructing Mbed LoRaWANInterface and passing it the radio object from lora_radio_helper. */ static LoRaWANInterface lorawan(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 lorawan_status_t loraStatus; // Initialize LoRaWAN stack if (lorawan.initialize(&ev_queue) != LORAWAN_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) != LORAWAN_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() != LORAWAN_STATUS_OK) { printf("\r\n enable_adaptive_datarate failed! \r\n"); return -1; } printf("\r\n Adaptive data rate (ADR) - Enabled \r\n"); loraStatus = lorawan.connect(); if (loraStatus == LORAWAN_STATUS_OK || loraStatus == LORAWAN_STATUS_CONNECT_IN_PROGRESS) { } else { printf("\r\n Connection error, code = %d \r\n", loraStatus); return -1; } printf("\r\n Connection - In Progress ...\r\n"); // make your event queue dispatching events forever ev_queue.dispatch_forever(); return 0; } /** * Sends a message to the Network Server */ static void send_message() { uint16_t packet_cont; int16_t loraStatus; uint8_t hash_content; uint8_t sensor_val; unsigned char output[32]; //Begin sensor if (ds1820.begin()) { ds1820.startConversion(); sensor_val = ds1820.read(); ds1820.startConversion(); } else { printf("\r\n No sensor found \r\n"); return; } hash_content = sensor_val; //Assign sensor value to hash_content printf("\r\n %d sensor value \r\n", hash_content); //print to check value char hash_str[] = ""; //create new char array sprintf(hash_str, "%d", hash_content); //put value into new char array static const unsigned char * hash_buffer = (const unsigned char * ) hash_str; //cast char array to const unsigned char static const size_t hash_len = strlen(hash_str); //get size of message mbedtls_sha256(hash_buffer, hash_len, output, 0); //hash message const char * c = (const char * ) output; //put hashed message into char packet_cont = sprintf((char * ) tx_buffer, "%d%s",hash_content , c); //build message with original value + hashed message loraStatus = lorawan.send(MBED_CONF_LORA_APP_PORT, tx_buffer, packet_cont, //send message MSG_UNCONFIRMED_FLAG); if (loraStatus < 0) { //perform checks to confirm message is sent loraStatus == LORAWAN_STATUS_WOULD_BLOCK ? printf("send - WOULD BLOCK\r\n") : printf("\r\n send() - Error code %d \r\n", loraStatus); return; } printf("\r\n %d bytes scheduled for transmission \r\n", loraStatus); //print if successful and clear tx buffer memset(tx_buffer, 0, sizeof(tx_buffer)); } /** * Receive a message from the Network Server */ static void receive_message() { uint8_t port; int flags; int16_t retcode = lorawan.receive(rx_buffer, sizeof(rx_buffer), port, flags); if (retcode < 0) { printf("\r\n receive() - Error code %d \r\n", retcode); return; } printf(" RX Data on port %u (%d bytes): ", port, retcode); for (uint8_t i = 0; i < retcode; i++) { printf("%02x ", rx_buffer[i]); } printf("\r\n"); memset(rx_buffer, 0, sizeof(rx_buffer)); } /** * Event handler */ static void lora_event_handler(lorawan_event_t event) { switch (event) { case CONNECTED: printf("\r\n Connection - Successful \r\n"); if (MBED_CONF_LORA_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 (MBED_CONF_LORA_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 (MBED_CONF_LORA_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; case UPLINK_REQUIRED: printf("\r\n Uplink required by NS \r\n"); if (MBED_CONF_LORA_DUTY_CYCLE_ON) { send_message(); } break; default: MBED_ASSERT("Unknown Event"); } } // EOF