bacnet_stack/ports/lwip

Port of BACnet/IP to LwIP 2.x

This LwIP BACnet/IP port uses a Makefile designed to be used from the continuous integration pipeline. The container is configured with Ubuntu Linux and uses APT to install liblwip-dev library and header files. This build method ensures that the code is valid for the particular LwIP library that is released with Ubuntu.

Integration Hints

Developer must set the IP address, netmask, and UDP port into the BACnet/IP module.

Integration used a main loop bare metal design, shown here as an example.

int main(void)
{
    static bool valid_ip_address = false;
    static bool bacnet_ip_initialized = false;

    bacnet_init();
    LwIP_Init();
    /* Infinite loop */
    for (;;) {
        /* Periodic tasks */
        LwIP_Periodic_Handler();
        /* Run when there is a valid IP address */
        if (netif.ip_addr.addr != 0) {
            if (!valid_ip_address) {
                valid_ip_address = true;
                bip_set_addr(netif.ip_addr.addr);
                bip_set_broadcast_addr(
                    (netif.ip_addr.addr & netif.netmask.addr) |
                    (~netif.netmask.addr));
            } else {
                if (bacnet_ip_initialized) {
                    bacnet_task();
                } else {
                    bip_init(NULL);
                    bacnet_ip_initialized = true;
                }
            }
        } else {
            valid_ip_address = false;
        }
    }
}