Alain Mouette wrote:
when using DHCP I call netifapi_dhcp_start() ant poll netif_is_up()
until the interface is up.
after some long time, if no connection can be made, I want to start DHCP
again (maybe the cable was diconnected and connected to another
network), what should be the correct procedure?
Should I jusr call netif_set_down() and start dhcp again? Will DHCP
renew itself after some timeout?
That depends on the reason for "no connection can be made": if the cable
is disconnected, you should notify the stack of it using
netif_set_link_down(). If you have registered a link callback
(netif_set_link_callback()) before, you can just call dhcp_renew() from
that callback.
Of course you can always call dhcp_renew() yourself, but the above is
the recommended (and correctly integrated) way to do it. This might be
integrated into the stack so that calling netif_set_link_down()/up()
would be enough.
Calling netif_set_down() and dhcp_start() would work, too, but might
lead to getting a different address (dhcp_renew() can re-request the old
address if the server still allows it).
Simon
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