bacnet_stack/zephyr/subsys/bacnet_basic/bacnet_basic.c

/**
 * @file
 * @brief BACnet Stack initialization and task handler
 * @author Steve Karg <skarg@users.sourceforge.net>
 * @date March 2024
 * @copyright SPDX-License-Identifier: MIT
 */
#include <stdint.h>
#include <stdbool.h>
/* BACnet Stack defines - first */
#include "bacnet/bacdef.h"
/* BACnet Stack core API */
#include "bacnet/npdu.h"
#include "bacnet/dcc.h"
#include "bacnet/iam.h"
/* BACnet Stack basic services */
#include "bacnet/basic/sys/mstimer.h"
#include "bacnet/basic/services.h"
#include "bacnet/basic/tsm/tsm.h"
#include "bacnet/datalink/datalink.h"
/* BACnet Stack basic objects */
#include "bacnet/basic/object/device.h"
/* objects */
#if (BACNET_PROTOCOL_REVISION >= 17)
#include "bacnet/basic/object/netport.h"
#endif
#include "bacnet/basic/object/device.h"
/* me */
#include "bacnet_basic/bacnet_basic.h"

/* 1s timer for basic non-critical timed tasks */
static struct mstimer BACnet_Task_Timer;
/* task timer for object functionality */
static struct mstimer BACnet_Object_Timer;
/* uptimer for BACnet task */
static unsigned long BACnet_Uptime_Seconds;
/* packet counter for BACnet task */
static unsigned long BACnet_Packet_Count;
/* local Device ID to track changes */
static uint32_t Device_ID = 0xFFFFFFFF;

/**
 * @brief Get the BACnet device uptime in seconds
 * @return The number of seconds the BACnet device has been running
 */
unsigned long bacnet_basic_uptime_seconds(void)
{
    return BACnet_Uptime_Seconds;
}

/**
 * @brief Get the BACnet device uptime in seconds
 * @return The number of seconds the BACnet device has been running
 */
unsigned long bacnet_basic_packet_count(void)
{
    return BACnet_Packet_Count;
}

/** 
 * @brief Initialize the BACnet device object, the service handlers, and timers
 */
void bacnet_basic_init(void)
{
    /* set up our confirmed service unrecognized service handler - required! */
    apdu_set_unrecognized_service_handler_handler(handler_unrecognized_service);
    /* we need to handle who-is to support dynamic device binding */
    apdu_set_unconfirmed_handler(SERVICE_UNCONFIRMED_WHO_IS, handler_who_is);
    apdu_set_unconfirmed_handler(SERVICE_UNCONFIRMED_WHO_HAS, handler_who_has);
    /* Set the handlers for any confirmed services that we support. */
    /* We must implement read property - it's required! */
    apdu_set_confirmed_handler(
        SERVICE_CONFIRMED_READ_PROPERTY, handler_read_property);
    apdu_set_confirmed_handler(
        SERVICE_CONFIRMED_READ_PROP_MULTIPLE, handler_read_property_multiple);
    apdu_set_confirmed_handler(
        SERVICE_CONFIRMED_WRITE_PROPERTY, handler_write_property);
    apdu_set_confirmed_handler(
        SERVICE_CONFIRMED_WRITE_PROP_MULTIPLE, handler_write_property_multiple);
    apdu_set_confirmed_handler(
        SERVICE_CONFIRMED_SUBSCRIBE_COV, handler_cov_subscribe);
    /* handle communication so we can shutup when asked, or restart */
    apdu_set_confirmed_handler(SERVICE_CONFIRMED_DEVICE_COMMUNICATION_CONTROL,
        handler_device_communication_control);
    apdu_set_confirmed_handler(
        SERVICE_CONFIRMED_REINITIALIZE_DEVICE, handler_reinitialize_device);
    /* start the 1 second timer for non-critical cyclic tasks */
    mstimer_set(&BACnet_Task_Timer, 1000L);
    /* start the timer for more time sensitive object specific cyclic tasks */
    mstimer_set(&BACnet_Object_Timer, 100UL);
}

/* local buffer for incoming PDUs to process */
static uint8_t PDUBuffer[MAX_MPDU];

/**
 * @brief non-blocking BACnet task
 */
void bacnet_basic_task(void)
{
    bool hello_world = false;
    uint16_t pdu_len = 0;
    BACNET_ADDRESS src = { 0 };
    uint32_t elapsed_milliseconds = 0;
    uint32_t elapsed_seconds = 0;

    /* hello, World! */
    if (Device_ID != Device_Object_Instance_Number()) {
        Device_ID = Device_Object_Instance_Number();
        hello_world = true;
    }
    if (hello_world) {
        Send_I_Am(&Handler_Transmit_Buffer[0]);
    }
    /* handle non-time-critical cyclic tasks */
    if (mstimer_expired(&BACnet_Task_Timer)) {
        /* 1 second tasks */
        mstimer_reset(&BACnet_Task_Timer);
        /* presume that the elapsed time is the interval time */
        elapsed_milliseconds = mstimer_interval(&BACnet_Task_Timer);
        elapsed_seconds = elapsed_milliseconds/1000;
        BACnet_Uptime_Seconds += elapsed_seconds;
        dcc_timer_seconds(elapsed_seconds);
        datalink_maintenance_timer(elapsed_seconds);
        handler_cov_timer_seconds(elapsed_seconds);
    }
    while (!handler_cov_fsm()) {
        /* waiting for COV processing to be IDLE */
    }
    /* object specific cyclic tasks */
    if (mstimer_expired(&BACnet_Object_Timer)) {
        mstimer_reset(&BACnet_Object_Timer);
        elapsed_milliseconds = mstimer_interval(&BACnet_Object_Timer);
        Device_Timer(elapsed_milliseconds);
    }
    /* handle the messaging */
    pdu_len = datalink_receive(&src, &PDUBuffer[0], sizeof(PDUBuffer), 0);
    if (pdu_len) {
        npdu_handler(&src, &PDUBuffer[0], pdu_len);
        BACnet_Packet_Count++;
    }
}