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[lwip-users] What happens to udp (and tcp) connections when changing ip

From: massimiliano cialdi
Subject: [lwip-users] What happens to udp (and tcp) connections when changing ip address?
Date: Wed, 12 Jul 2017 10:00:20 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.2.1

I use lwip 2.0.2 + FreeRTOS 9.0.0

I have a ask that implement udp server:

static void udpMan_Task(void)
    struct netbuf *buf;
    char *buffer;
    err_t err;
    client_desc_t client;

    UdpConn = netconn_new(NETCONN_UDP);
    LWIP_ASSERT("con != NULL", UdpConn != NULL);

int timeout_ms = DHCP_FINE_TIMER_MSECS; // this timeout has to be less than DHCP_FINE_TIMER_MSECS

    while (1) {
        err = netconn_bind(UdpConn, NULL, CONFIG_UDP_PBUS_PORT);
        netconn_set_recvtimeout (UdpConn, timeout_ms);

        while ((err == ERR_OK) || (err == ERR_TIMEOUT)) {
            err = netconn_recv(UdpConn, &buf);
            if (err == ERR_OK) {
                // compute received data

        } // end receiving loop

    } // end global loop

What happens when changing ip address with netifapi_netif_set_addr()? What actions should i do in the udp task?
How can I notice the change of IP?

best regards


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