settings-characteristic.cpp

/**
   @file settings-service.cpp
   @author Bernd Giesecke (bernd.giesecke@rakwireless.com)
   @brief Handler for LoRaWAN settings service
   @version 0.1
   @date 2021-01-10

   @copyright Copyright (c) 2021

*/

#include "main.h"

/** LoRaWAN service 0xF0A0 */
BLEService lorawan_service = BLEService(0xF0A0);
/** LoRa settings  characteristic 0xF0A1 */
BLECharacteristic lorawan_data = BLECharacteristic(0xF0A1);

// Command callback
void settings_rx_callback(uint16_t conn_hdl, BLECharacteristic *chr, uint8_t *data, uint16_t len);

/**
   @brief Initialize the settings characteristic

*/
void init_settings_characteristic(void)
{
  // Initialize the LoRaWAN setting service
  lorawan_service.begin();
  lorawan_data.setProperties(CHR_PROPS_NOTIFY | CHR_PROPS_READ | CHR_PROPS_WRITE);
  lorawan_data.setPermission(SECMODE_OPEN, SECMODE_OPEN);
  lorawan_data.setFixedLen(sizeof(s_lorawan_settings) + 1);
  lorawan_data.setWriteCallback(settings_rx_callback);

  lorawan_data.begin();

  lorawan_data.write((void *)&g_lorawan_settings, sizeof(s_lorawan_settings));
}

/**
   Callback if data has been sent from the connected client
   @param conn_hdl
  		The connection handle
   @param chr
        The called characteristic
   @param data
        Pointer to received data
   @param len
        Length of the received data
*/
void settings_rx_callback(uint16_t conn_hdl, BLECharacteristic *chr, uint8_t *data, uint16_t len)
{
  MYLOG("SETT", "Settings received");

  delay(1000);

  // Check the characteristic
  if (chr->uuid == lorawan_data.uuid)
  {
    if (len != sizeof(s_lorawan_settings))
    {
      MYLOG("SETT", "Received settings have wrong size %d", len);
      return;
    }

    s_lorawan_settings *rcvdSettings = (s_lorawan_settings *)data;
    if ((rcvdSettings->valid_mark_1 != 0xAA) || (rcvdSettings->valid_mark_2 != LORAWAN_DATA_MARKER))
    {
      MYLOG("SETT", "Received settings data do not have required markers");
      return;
    }

    // Save new LoRaWAN settings
    memcpy((void *)&g_lorawan_settings, data, sizeof(s_lorawan_settings));

    // Save new settings
    save_settings();

    // Update settings
    lorawan_data.write((void *)&g_lorawan_settings, sizeof(s_lorawan_settings));

    // Inform connected device about new settings
    lorawan_data.notify((void *)&g_lorawan_settings, sizeof(s_lorawan_settings));

    if (g_lorawan_settings.resetRequest)
    {
      MYLOG("SETT", "Initiate reset");
      delay(1000);
      sd_nvic_SystemReset();
    }

    // Notify task about the event
    if (g_task_sem != NULL)
    {
      g_task_event_type = 2;
      MYLOG("SETT", "Waking up loop task");
      xSemaphoreGive(g_task_sem);
    }
  }
}