/*******************************************************************************
 *
 * ttn-esp32 - The Things Network device library for ESP-IDF / SX127x
 *
 * Copyright (c) 2018-2021 Manuel Bleichenbacher
 *
 * Licensed under MIT License
 * https://opensource.org/licenses/MIT
 *
 * High-level C++ API for ttn-esp32.
 *******************************************************************************/

/**
 * @file TheThingsNetwork.h
 */

#ifndef _THETHINGSNETWORK_H_
#define _THETHINGSNETWORK_H_

#include "ttn.h"

/**
 * @brief Integer data type for specified the port of an uplink or downlink message.
 *
 * @deprecated Use @ref ttn_port_t instead.
 */
typedef ttn_port_t port_t;

/**
 * @brief Response codes
 */
enum TTNResponseCode
{
    /** @brief Transmission failed error */
    kTTNErrorTransmissionFailed = TTN_ERROR_TRANSMISSION_FAILED,
    /** @brief Unexpected or internal error */
    kTTNErrorUnexpected = TTN_ERROR_UNEXPECTED,
    /** @brief Successful transmission of an uplink message */
    kTTNSuccessfulTransmission = TTN_SUCCESSFUL_TRANSMISSION,
    /** @brief Successful receipt of a downlink message */
    kTTNSuccessfulReceive = TTN_SUCCESSFUL_RECEIVE
};

/**
 * @brief RX/TX window
 */
enum TTNRxTxWindow
{
    /**
     * @brief Outside RX/TX window
     */
    kTTNIdleWindow = TTN_WINDOW_IDLE,
    /**
     * @brief Transmission window (up to RX1 window)
     */
    kTTNTxWindow = TTN_WINDOW_TX,
    /**
     * @brief Reception window 1 (up to RX2 window)
     */
    kTTNRx1Window = TTN_WINDOW_RX1,
    /**
     * @brief Reception window 2
     */
    kTTNRx2Window = TTN_WINDOW_RX2
};

/**
 * @brief Spreading Factor
 */
enum TTNSpreadingFactor
{
    /**
     * @brief Unused / undefined spreading factor
     */
    kTTNSFNone = TTN_SF_NONE,
    /**
     * @brief Frequency Shift Keying (FSK)
     */
    kTTNFSK = TTN_FSK,
    /**
     * @brief Spreading Factor 7 (SF7)
     */
    kTTNSF7 = TTN_SF7,
    /**
     * @brief Spreading Factor 8 (SF8)
     */
    kTTNSF8 = TTN_SF8,
    /**
     * @brief Spreading Factor 9 (SF9)
     */
    kTTNSF9 = TTN_SF9,
    /**
     * @brief Spreading Factor 10 (SF10)
     */
    kTTNSF10 = TTN_SF10,
    /**
     * @brief Spreading Factor 11 (SF11)
     */
    kTTNSF11 = TTN_SF11,
    /**
     * @brief Spreading Factor 12 (SF12)
     */
    kTTNSF12 = TTN_SF12
};

/**
 * @brief Bandwidth
 */
enum TTNBandwidth
{
    /**
     * @brief Undefined/unused bandwidth
     */
    kTTNBWNone = TTN_BW_NONE,
    /**
     * @brief Bandwidth of 125 kHz
     */
    kTTNBW125 = TTN_BW_125,
    /**
     * @brief Bandwidth of 250 kHz
     */
    kTTNBW250 = TTN_BW_250,
    /**
     * @brief Bandwidth of 500 kHz
     */
    kTTNBW500 = TTN_BW_500
};

/**
 * @brief Data Rate
 *
 * Note that the spreading factor, bandwidth, bit rate and maximum message
 * size associated with each data rate depends on the region.
 */
enum TTNDataRate
{
    /**
     * @brief Data rate for region AS923 using SF12 and 125 kHz bandwidth.
     */
    kTTNDataRate_AS923_SF12 = 0,
    /**
     * @brief Data rate for region AS923 using SF11 and 125 kHz bandwidth.
     */
    kTTNDataRate_AS923_SF11 = 1,
    /**
     * @brief Data rate for region AS923 using SF10 and 125 kHz bandwidth.
     */
    kTTNDataRate_AS923_SF10 = 2,
    /**
     * @brief Data rate for region AS923 using SF9 and 125 kHz bandwidth.
     */
    kTTNDataRate_AS923_SF9 = 3,
    /**
     * @brief Data rate for region AS923 using SF8 and 125 kHz bandwidth.
     */
    kTTNDataRate_AS923_SF8 = 4,
    /**
     * @brief Data rate for region AS923 using SF7 and 125 kHz bandwidth.
     */
    kTTNDataRate_AS923_SF7_BW125 = 5,
    /**
     * @brief Data rate for region AS923 using SF7 and 250 kHz bandwidth.
     */
    kTTNDataRate_AS923_SF7_BW250 = 6,
    /**
     * @brief Data rate for region AS923 using FSK and 50 kpbs.
     */
    kTTNDataRate_AS923_FSK = 7,

    /**
     * @brief Data rate for region AU915 using SF12 and 125 kHz bandwidth.
     */
    kTTNDataRate_AU915_SF12 = 0,
    /**
     * @brief Data rate for region AU915 using SF11 and 125 kHz bandwidth.
     */
    kTTNDataRate_AU915_SF11 = 1,
    /**
     * @brief Data rate for region AU915 using SF10 and 125 kHz bandwidth.
     */
    kTTNDataRate_AU915_SF10 = 2,
    /**
     * @brief Data rate for region AU915 using SF9 and 125 kHz bandwidth.
     */
    kTTNDataRate_AU915_SF9 = 3,
    /**
     * @brief Data rate for region AU915 using SF8 and 125 kHz bandwidth.
     */
    kTTNDataRate_AU915_SF8 = 4,
    /**
     * @brief Data rate for region AU915 using SF7 and 125 kHz bandwidth.
     */
    kTTNDataRate_AU915_SF7 = 5,
    /**
     * @brief Data rate for region AU915 using SF8 and 500 kHz bandwidth.
     */
    kTTNDataRate_AU915_SF8_BW500 = 6,
    /**
     * @brief Data rate for region AU915 using SF12 and 500 kHz bandwidth.
     *
     * Reserved for future applications.
     */
    kTTNDataRate_AU915_SF12_BW500 = 8,
    /**
     * @brief Data rate for region AU915 using SF11 and 500 kHz bandwidth.
     *
     * Reserved for future applications.
     */
    kTTNDataRate_AU915_SF11_BW500 = 9,
    /**
     * @brief Data rate for region AU915 using SF10 and 500 kHz bandwidth.
     *
     * Reserved for future applications.
     */
    kTTNDataRate_AU915_SF10_BW500 = 10,
    /**
     * @brief Data rate for region AU915 using SF9 and 500 kHz bandwidth.
     *
     * Reserved for future applications.
     */
    kTTNDataRate_AU915_SF9_BW500 = 11,
    /**
     * @brief Data rate for region AU915 using SF8 and 500 kHz bandwidth.
     *
     * Reserved for future applications.
     */
    kTTNDataRate_AU915_SF8_BW500_DR12 = 12,
    /**
     * @brief Data rate for region AU915 using SF7 and 500 kHz bandwidth.
     *
     * Reserved for future applications.
     */
    kTTNDataRate_AU915_SF7_BW500 = 13,

    /**
     * @brief Data rate for region EU868 using SF12 and 125 kHz bandwidth.
     */
    kTTNDataRate_EU868_SF12 = 0,
    /**
     * @brief Data rate for region EU868 using SF11 and 125 kHz bandwidth.
     */
    kTTNDataRate_EU868_SF11 = 1,
    /**
     * @brief Data rate for region EU868 using SF10 and 125 kHz bandwidth.
     */
    kTTNDataRate_EU868_SF10 = 2,
    /**
     * @brief Data rate for region EU868 using SF9 and 125 kHz bandwidth.
     */
    kTTNDataRate_EU868_SF9 = 3,
    /**
     * @brief Data rate for region EU868 using SF8 and 125 kHz bandwidth.
     */
    kTTNDataRate_EU868_SF8 = 4,
    /**
     * @brief Data rate for region EU868 using SF7 and 125 kHz bandwidth.
     */
    kTTNDataRate_EU868_SF7_BW125 = 5,
    /**
     * @brief Data rate for region EU868 using SF7 and 250 kHz bandwidth.
     */
    kTTNDataRate_EU868_SF7_BW250 = 6,
    /**
     * @brief Data rate for region EU868 using FSK and 50 kpbs.
     */
    kTTNDataRate_EU868_FSK = 7,

    /**
     * @brief Data rate for region IN866 using SF12 and 125 kHz bandwidth.
     */
    kTTNDataRate_IN866_SF12 = 0,
    /**
     * @brief Data rate for region IN866 using SF11 and 125 kHz bandwidth.
     */
    kTTNDataRate_IN866_SF11 = 1,
    /**
     * @brief Data rate for region IN866 using SF10 and 125 kHz bandwidth.
     */
    kTTNDataRate_IN866_SF10 = 2,
    /**
     * @brief Data rate for region IN866 using SF9 and 125 kHz bandwidth.
     */
    kTTNDataRate_IN866_SF9 = 3,
    /**
     * @brief Data rate for region IN866 using SF8 and 125 kHz bandwidth.
     */
    kTTNDataRate_IN866_SF8 = 4,
    /**
     * @brief Data rate for region IN866 using SF7 and 125 kHz bandwidth.
     */
    kTTNDataRate_IN866_SF7 = 5,
    /**
     * @brief Data rate for region IN866 using FSK and 50 kpbs.
     */
    kTTNDataRate_IN866_FSK = 7,

    /**
     * @brief Data rate for region KR920 using SF12 and 125 kHz bandwidth.
     */
    kTTNDataRate_KR920_SF12 = 0,
    /**
     * @brief Data rate for region KR920 using SF11 and 125 kHz bandwidth.
     */
    kTTNDataRate_KR920_SF11 = 1,
    /**
     * @brief Data rate for region KR920 using SF10 and 125 kHz bandwidth.
     */
    kTTNDataRate_KR920_SF10 = 2,
    /**
     * @brief Data rate for region KR920 using SF9 and 125 kHz bandwidth.
     */
    kTTNDataRate_KR920_SF9 = 3,
    /**
     * @brief Data rate for region KR920 using SF8 and 125 kHz bandwidth.
     */
    kTTNDataRate_KR920_SF8 = 4,
    /**
     * @brief Data rate for region KR920 using SF7 and 125 kHz bandwidth.
     */
    kTTNDataRate_KR920_SF7 = 5,

    /**
     * @brief Data rate for region US915 using SF10 and 125 kHz bandwidth.
     */
    kTTNDataRate_US915_SF10 = 0,
    /**
     * @brief Data rate for region US915 using SF9 and 125 kHz bandwidth.
     */
    kTTNDataRate_US915_SF9 = 1,
    /**
     * @brief Data rate for region US915 using SF8 and 125 kHz bandwidth.
     */
    kTTNDataRate_US915_SF8 = 2,
    /**
     * @brief Data rate for region US915 using SF7 and 125 kHz bandwidth.
     */
    kTTNDataRate_US915_SF7 = 3,
    /**
     * @brief Data rate for region US915 using SF8 and 500 kHz bandwidth.
     */
    kTTNDataRate_US915_SF8_BW500 = 4,
    /**
     * @brief Data rate for region US915 using SF12 and 500 kHz bandwidth.
     *
     * Reserved for future applications.
     */
    kTTNDataRate_US915_SF12_BW500 = 8,
    /**
     * @brief Data rate for region US915 using SF11 and 500 kHz bandwidth.
     *
     * Reserved for future applications.
     */
    kTTNDataRate_US915_SF11_BW500 = 9,
    /**
     * @brief Data rate for region US915 using SF10 and 500 kHz bandwidth.
     *
     * Reserved for future applications.
     */
    kTTNDataRate_US915_SF10_BW500 = 10,
    /**
     * @brief Data rate for region US915 using SF9 and 500 kHz bandwidth.
     *
     * Reserved for future applications.
     */
    kTTNDataRate_US915_SF9_BW500 = 11,
    /**
     * @brief Data rate for region US915 using SF8 and 500 kHz bandwidth.
     *
     * Reserved for future applications.
     */
    kTTNDataRate_US915_SF8_BW500_DR12 = 12,
    /**
     * @brief Data rate for region US915 using SF7 and 500 kHz bandwidth.
     *
     * Reserved for future applications.
     */
    kTTNDataRate_US915_SF7_BW500 = 13,

    /**
     * @brief Default data rate for joining
     */
    kTTNDRJoinDdefault
};

/**
 * @brief RF settings for TX or RX
 */
struct TTNRFSettings
{
    /**
     * @brief Spreading Factor (SF)
     */
    TTNSpreadingFactor spreadingFactor;
    /**
     * @brief Bandwidth (BW)
     */
    TTNBandwidth bandwidth;
    /**
     * @brief Frequency, in Hz
     */
    uint32_t frequency;
};

/**
 * @brief Callback for recieved messages
 *
 * @param payload  pointer to the received bytes
 * @param length   number of received bytes
 * @param port     port the message was received on
 */
typedef void (*TTNMessageCallback)(const uint8_t *payload, size_t length, ttn_port_t port);

/**
 * @brief TTN device
 *
 * This class enables ESP32 devices with SX1272/73/76/77/78/79 LoRaWAN chips
 * to communicate via The Things Network.
 *
 * Only one instance of this class may be created.
 */
class TheThingsNetwork
{
  public:
    /**
     * @brief Constructs a new The Things Network device instance.
     */
    TheThingsNetwork()
    {
        ttn_init();
    }

    /**
     * @brief Destroys the The Things Network device instance.
     */
    ~TheThingsNetwork()
    {
    }

    /**
     * @brief Resets the LoRaWAN radio.
     *
     * To restart communication, @ref join() must be called.
     * Clears neither the provisioned keys nor the configured pins.
     */
    void reset()
    {
        ttn_reset();
    }

    /**
     * @brief Configures the pins used to communicate with the LoRaWAN radio chip.
     *
     * Before calling this member function, the SPI bus needs to be configured using `spi_bus_initialize()`.
     * Additionally, `gpio_install_isr_service()` must have been called to initialize the GPIO ISR handler service.
     *
     * @param spi_host  The SPI bus/peripherial to use (`SPI_HOST`, `HSPI_HOST` or `VSPI_HOST`).
     * @param nss       The GPIO pin number connected to the radio chip's NSS pin (serving as the SPI chip select)
     * @param rxtx      The GPIO pin number connected to the radio chip's RXTX pin (@ref TTN_NOT_CONNECTED if not
     * connected)
     * @param rst       The GPIO pin number connected to the radio chip's RST pin (@ref TTN_NOT_CONNECTED if not
     * connected)
     * @param dio0      The GPIO pin number connected to the radio chip's DIO0 pin
     * @param dio1      The GPIO pin number connected to the radio chip's DIO1 pin
     */
    void configurePins(spi_host_device_t spi_host, uint8_t nss, uint8_t rxtx, uint8_t rst, uint8_t dio0, uint8_t dio1)
    {
        ttn_configure_pins(spi_host, nss, rxtx, rst, dio0, dio1);
    }

    /**
     * @brief Sets the frequency sub-band to be used.
     *
     * For regions with sub-bands (USA, Australia), sets the sub-band to be used for uplink communication.
     * For other regions, this function has no effect.
     *
     * The sub-band must be set before joining or sending the first message.
     *
     * If not set, it defaults to sub-band 2 as defined by TTN.
     *
     * @param band band (0 for all bands, or value between 1 and 8)
     */
    void setSubband(int band)
    {
        ttn_set_subband(band);
    }

    /**
     * @brief Sets the credentials needed to activate the device via OTAA, without activating it.
     *
     * The provided DevEUI, AppEUI/JoinEUI and AppKey are saved in non-volatile memory. Before
     * this function is called, `nvs_flash_init()` must have been called once.
     *
     * Call @ref join() to activate the device.
     *
     * @param devEui  DevEUI (16 character string with hexadecimal data)
     * @param appEui  AppEUI/JoinEUI of the device (16 character string with hexadecimal data)
     * @param appKey  AppKey of the device (32 character string with hexadecimal data)
     * @return `true` if the provisioning was successful, `false`  if the provisioning failed
     */
    bool provision(const char *devEui, const char *appEui, const char *appKey)
    {
        return ttn_provision(devEui, appEui, appKey);
    }

    /**
     * @brief Sets the information needed to activate the device via OTAA, using the MAC to generate the DevEUI
     * and without activating it.
     *
     * The generated DevEUI and the provided AppEUI/JoinEUI and AppKey are saved in non-volatile memory. Before
     * this function is called, `nvs_flash_init` must have been called once.
     *
     * The DevEUI is generated by retrieving the ESP32's WiFi MAC address and expanding it into a DevEUI
     * by adding FFFE in the middle. So the MAC address A0:B1:C2:01:02:03 becomes the EUI A0B1C2FFFE010203.
     * This hexadecimal data can be entered into the DevEUI field in the TTN console.
     *
     * Generating the DevEUI from the MAC address allows to flash the same AppEUI/JoinEUI and AppKey to a batch of
     * devices. However, using the same AppKey for multiple devices is insecure. Only use this approach if
     * it is okay for that the LoRa communication of your application can easily be intercepted and that
     * forged data can be injected.
     *
     * Call @ref join() to activate.
     *
     * @param appEui  AppEUI/JoinEUI of the device (16 character string with hexadecimal data)
     * @param appKey  AppKey of the device (32 character string with hexadecimal data)
     * @return `true` if the provisioning was successful, `false`  if the provisioning failed
     */
    bool provisionWithMAC(const char *appEui, const char *appKey)
    {
        return ttn_provision_with_mac(appEui, appKey);
    }

    /**
     * @brief Starts task listening on configured UART for AT commands.
     *
     * Run `make menuconfig` to configure it.
     */
    void startProvisioningTask()
    {
        ttn_start_provisioning_task();
    }

    /**
     * @brief Waits until the DevEUI, AppEUI/JoinEUI and AppKey have been provisioned
     * by the provisioning task.
     *
     * If the device has already been provisioned (stored data in NVS, call of provision()
     * or call of @ref join(const char*, const char*, const char*), this function
     * immediately returns.
     */
    void waitForProvisioning()
    {
        ttn_wait_for_provisioning();
    }

    /**
     * @brief Activates the device via OTAA.
     *
     * The DevEUI, AppEUI/JoinEUI and AppKey must have already been provisioned by a call to provision().
     * Before this function is called, `nvs_flash_init()` must have been called once.
     *
     * The function blocks until the activation has completed or failed.
     *
     * @return `true` if the activation was succesful, `false` if the activation failed
     */
    bool join()
    {
        return ttn_join_provisioned();
    }

    /**
     * @brief Sets the DevEUI, AppEUI/JoinEUI and AppKey and activate the device via OTAA.
     *
     * The DevEUI, AppEUI/JoinEUI and AppKey are NOT saved in non-volatile memory.
     *
     * The function blocks until the activation has completed or failed.
     *
     * @param devEui  DevEUI (16 character string with hexadecimal data)
     * @param appEui  AppEUI/JoinEUI of the device (16 character string with hexadecimal data)
     * @param appKey  AppKey of the device (32 character string with hexadecimal data)
     * @return `true` if the activation was succesful, `false` if the activation failed
     */
    bool join(const char *devEui, const char *appEui, const char *appKey)
    {
        return ttn_join(devEui, appEui, appKey);
    }

    /**
     * @brief Transmits a message
     *
     * The function blocks until the message could be transmitted and a message has been received
     * in the subsequent receive window (or the window expires). Additionally, the function will
     * first wait until the duty cycle allows a transmission (enforcing the duty cycle limits).
     *
     * @param payload  bytes to be transmitted
     * @param length   number of bytes to be transmitted
     * @param port     port (defaults to 1)
     * @param confirm  flag indicating if a confirmation should be requested. Defaults to `false`
     * @return @ref kTTNSuccessfulTransmission for successful transmission, @ref kTTNErrorTransmissionFailed for failed
     * transmission, @ref kTTNErrorUnexpected for unexpected error
     */
    TTNResponseCode transmitMessage(const uint8_t *payload, size_t length, ttn_port_t port = 1, bool confirm = false)
    {
        return static_cast<TTNResponseCode>(ttn_transmit_message(payload, length, port, confirm));
    }

    /**
     * @brief Sets the function to be called when a message is received
     *
     * When a message is received, the specified function is called. The
     * message, its length and the port number are provided as
     * parameters. The values are only valid during the duration of the
     * callback. So they must be immediately processed or copied.
     *
     * Messages are received as a result of a call to @ref transmitMessage(). The callback is called
     * in the task that called this function and it occurs before this function
     * returns control to the caller.
     *
     * @param callback  the callback function
     */
    void onMessage(TTNMessageCallback callback)
    {
        ttn_on_message(callback);
    }

    /**
     * @brief Checks if DevEUI, AppEUI/JoinEUI and AppKey have been stored in non-volatile storage
     * or have been provided as by a call to @ref join(const char*, const char*, const char*).
     *
     * @return `true` if they are stored, complete and of the correct size, `false` otherwise
     */
    bool isProvisioned()
    {
        return ttn_is_provisioned();
    }

    /**
     * @brief Sets the RSSI calibration value for LBT (Listen Before Talk).
     *
     * This value is added to RSSI measured prior to decision. It must include the guardband.
     * Ignored in US, EU, IN and other countries where LBT is not required.
     * Defaults to 10 dB.
     *
     * @param rssiCal RSSI calibration value, in dB
     */
    void setRSSICal(int8_t rssiCal)
    {
        ttn_set_rssi_cal(rssiCal);
    }

    /**
     * Returns whether Adaptive Data Rate (ADR) is enabled.
     *
     * @return `true` if enabled, `false` if disabled
     */
    bool adrEnabled()
    {
        return ttn_adr_enabled();
    }

    /**
     * @brief Enables or disabled Adaptive Data Rate (ADR).
     *
     * ADR is enabled by default. It optimizes data rate, airtime and energy consumption
     * for devices with stable RF conditions. It should be turned off for mobile devices.
     *
     * @param enabled `true` to enable, `false` to disable
     */
    void setAdrEnabled(bool enabled)
    {
        ttn_set_adr_enabled(enabled);
    }

    /**
     * @brief Sets the transmission data rate (i.e. the data rate for uplink messages).
     *
     * If ADR is enabled, it's is used as the initial data rate and later adjusted depending
     * on the RF conditions. If ADR is disabled, it is used for all uplink messages.
     *
     * @param data_rate data rate (use constants of enum @ref TTNDataRate)
     */
    void setDataRate(TTNDataRate data_rate)
    {
        ttn_set_data_rate(static_cast<ttn_data_rate_t>(data_rate));
    }

    /**
     * @brief Sets the maximum power for transmission
     *
     * The power is specified in dBm and sets the power emitted by the radio.
     * If the antenna has a gain, it must be substracted from the specified value to
     * achieve the correct transmission power.
     *
     * @param tx_pow power, in dBm
     */
    void setMaxTxPower(int tx_pow)
    {
        ttn_set_max_tx_pow(tx_pow);
    }

    /**
     * @brief Stops all activies and shuts down the RF module and the background tasks.
     *
     * To restart communication, @ref startup() and @ref join() must be called.
     * it neither clears the provisioned keys nor the configured pins.
     */
    void shutdown()
    {
        ttn_shutdown();
    }

    /**
     * @brief Restarts the background tasks and RF module.
     *
     * This member function must only be called after a call to shutdowna().
     */
    void startup()
    {
        ttn_startup();
    }

    /**
     * @brief Gets current RX/TX window
     * @return window
     */
    TTNRxTxWindow rxTxWindow()
    {
        return static_cast<TTNRxTxWindow>(ttn_rx_tx_window());
    }

    /**
     * @brief Gets the RF settings for the specified window
     * @param window RX/TX window (valid values are @ref kTTNTxWindow, @ref kTTNRx1Window and @ref kTTNRx2Window)
     */
    TTNRFSettings getRFSettings(TTNRxTxWindow window);

    /**
     * @brief Gets the RF settings of the last (or ongoing) transmission.
     * @return RF settings
     */
    TTNRFSettings txSettings()
    {
        return getRFSettings(kTTNTxWindow);
    }

    /**
     * @brief Gets the RF settings of the last (or ongoing) reception of RX window 1.
     * @return RF settings
     */
    TTNRFSettings rx1Settings()
    {
        return getRFSettings(kTTNRx1Window);
    }

    /**
     * @brief Gets the RF settings of the last (or ongoing) reception of RX window 2.
     * @return RF settings
     */
    TTNRFSettings rx2Settings()
    {
        return getRFSettings(kTTNRx2Window);
    }

    /**
     * @brief Gets the received signal strength indicator (RSSI).
     *
     * RSSI is the measured signal strength of the last recevied message (incl. join responses).
     *
     * @return RSSI, in dBm
     */
    int rssi()
    {
        return ttn_rssi();
    }
};

#endif