#80 simple bacnet server with 1 AV

[Ben Bartling]

Hi,

Is it possible for learning purposes to create a real simple-server? Can I get a tip on how to fix the linker errors when I compile with make simple-server from the root dir? I created a main.c and Makefile like the other example apps.

BACNET_SRC_DIR = $(realpath ../../src)
BACNET_LIB_DIR = $(realpath ../../lib)

CC = gcc
#CFLAGS = -I$(BACNET_SRC_DIR) -std=gnu99
CFLAGS = -I$(BACNET_SRC_DIR) -std=gnu99 -Wall -Wextra

LFLAGS = -L$(BACNET_LIB_DIR) -lbacnet

TARGET = simple_server

# Include all necessary C source files
SRC = main.c \
      $(BACNET_SRC_DIR)/bacnet/basic/object/av.c \
      $(BACNET_SRC_DIR)/bacnet/basic/sys/mstimer.c \
      $(BACNET_SRC_DIR)/bacnet/datalink/bip.c \
      $(BACNET_SRC_DIR)/bacnet/basic/object/device.c \
      $(BACNET_SRC_DIR)/bacnet/basic/sys/sfilename.c \
      $(BACNET_SRC_DIR)/bacnet/basic/sys/sbuf.c

OBJS = $(SRC:.c=.o)

all: $(TARGET)

$(TARGET): $(OBJS)
    $(CC) $(OBJS) $(LFLAGS) -o $@

.c.o:
    $(CC) -c $(CFLAGS) $< -o $@

clean:
    rm -f $(OBJS) $(TARGET)

.PHONY: all clean

This is my fake temp sensor main.c:

#include "bacnet/basic/sys/mstimer.h"

#include "bacnet/datalink/bip.h"
#include "bacnet/basic/object/device.h"
#include "bacnet/basic/object/av.h"
#include "bacnet/datalink/bip.h"


static struct mstimer Update_Timer;
static float space_temperature = 24.5;

void Analog_Value_Init(void) {
    static bool initialized = false;
    if (!initialized) {
        initialized = true;
        Analog_Value_Create(0); // Instance 0
        Analog_Value_Units_Set(0, UNITS_DEGREES_CELSIUS);
        Analog_Value_Present_Value_Set(0, space_temperature, 10);
    }
}

void Update_Analog_Value(void) {
    mstimer_reset(&Update_Timer);
    space_temperature += 0.1;  // Update the temperature for simulation
    Analog_Value_Present_Value_Set(0, space_temperature, 10);
}

int main(void) {
    BACNET_ADDRESS src = {0};  // source address

    Device_Set_Object_Instance_Number(12345); // Set device instance number
    bip_init(NULL);  // BACnet/IP initialization
    Analog_Value_Init();  // Initialize the Analog Value object

    mstimer_set(&Update_Timer, 1000);  // 1 second timer

    while (1) {
        bip_network_layer_task();  // BACnet tasks
        if (mstimer_expired(&Update_Timer)) {
            Update_Analog_Value();
        }
    }
    return 0;
}

Traceback:

ben@benspi:~/bacnet-stack $ make simple-server 
make -s -C apps/simple-server all
main.c: In function 'main':
main.c:38:9: warning: implicit declaration of function 'bip_network_layer_task' [-Wimplicit-function-declaration]
   38 |         bip_network_layer_task();  // BACnet tasks
      |         ^~~~~~~~~~~~~~~~~~~~~~
main.c:29:20: warning: unused variable 'src' [-Wunused-variable]
   29 |     BACNET_ADDRESS src = {0};  // source address
      |                    ^~~
make[1]: *** No rule to make target '/home/ben/bacnet-stack/src/bacnet/datalink/bip.o', needed by 'simple_server'.  Stop.
make: *** [Makefile:437: simple-server] Error 2