Am 16.02.2021 um 15:55 schrieb matt swindell: > Hello, > > > > I am new to LWIP currently I am using LWIP 2.1.2 with no OS (NO_SYS = 1) > in lwipopts.h. > > > > My question is about the connection/disconnection from the DHCP server. > Using Wireshark I am able to see the initial DHCP request and properly > receive an IP address, followed by ARP announcements. The device seems > to survive an initial disconnect, sending a Request to validate it’s IP > and an ACK from the DHCP server once reconnected. However, further > disconnects and reconnections appear to confuse the device. > > > > I have a PHY interrupt callback which calls netif_set_link_down() and > netif_set_link_up() when the PHY link status changes. Since the dhcp > state was bound dhcp_reboot() is called from dhcp_network_changed(). > This all seems to work fine until we hit the dhcp_timeout() and my dhcp > tries are greater than or equal to REBOOT_TRIES, at which point it calls > dhcp_discover() and I get stuck in a loop where the device sends a > discovery message and is offered an IP address back but it gets ignored. > > > > By increasing REBOOT_TRIES I am able to get a few more reconnections > without problem, but at some point it always seems to get stuck in that > dhcp discovery loop. > > > > I am unsure if I have done something incorrectly or if I am confusing > the DHCP state machine, but from everything I have read with regards to > LWIP > 2.x.x > > calling netif_set_link_up/down() should be sufficient for maintaining > DHCP once dhcp_start() has been called. > > > > Any help would be greatly appreciated.
I'm not aware of a bug here, but I'm not sure. It would probably be best if you could reproduce this with a unit test? Regards, Simon _______________________________________________ lwip-users mailing list [email protected] https://lists.nongnu.org/mailman/listinfo/lwip-users
