Replying to my own post:
Attached wireshark capture screencap:
The PC host 192.168.1.34 sends out a mDNS question.
I was expecting that, the udp_recv() within
/**
* @ingroup mdns
* Initiate MDNS responder. Will open UDP sockets on port 5353
*/
void
mdns_resp_init(void)
would be receiving the mDNS question. But in fact, it does not, when
used in a mdns_example_init() from mdns_example.c context.
So, I started looking to use udp_recv outside of mdns.c, but then the
udp_pcb is static.
static struct udp_pcb *mdns_pcb;
Is something amiss in what I have understood ? Am I going on a wrong track ?
Thanks for any pointers.
Manu
On Sun, Aug 30, 2020 at 10:10 PM Manu Abraham <abraham.m...@gmail.com> wrote:
>
> Greetings,
>
> Trying to get mdns from lwip/apps working.
>
> I have the following code running:
>
> void netpnp_thread(void *arg)
> {
> struct netif *netif = arg;
>
> xSemaphoreTake(sem_mdns, portMAX_DELAY);
> osDelay(1000);
>
> igmp_report_groups(netif);
> mdns_example_init();
>
> while (1);
> }
>
>
> With that mdns works with the mdns_example_init() shamelessly copied
> from mdns_example.c, DHCP client has already created a multicast group
> with address 224.0.0.1
>
> This is verified from the igmp debug log.
>
> My question is thus; How and when should an announcement be done ?
> Does the browser application request the announcement request ?
> If so, how should that be handled ?
>
>
> Thanks,
>
> Manu
>
>
> (292) StartThread:
> igmp_init: initializing
> (257) Netif_Config: Configuring Network
> igmp_start: starting IGMP processing on if 24000234
> igmp_lookup_group: allocated a new group with address 224.0.0.1 on if 24000234
> (342) dhcp_thread:
> DHCP state : 132
> DHCP state : SELECTING
> DHCP state : CHECKING
> igmp_report_groups: sending IGMP reports on if 24000234
> DHCP state : BOUND
>
> IPv4 Address : 192.168.1.33
> IPv4 Subnet mask : 255.255.255.0
> IPv4 Gateway : 192.168.1.1
>
> Lease period: 86400s, Renew in: 43200s, Rebind in: 75600s
>
> (330) print_dhcp_state: DHCP Bound
> igmp_report_groups: sending IGMP reports on if 24000234
> igmp_lookup_group: allocated a new group with address 224.0.0.251 on if
> 24000234
> igmp_joingroup_netif: join to new group: 224.0.0.251
> igmp_timeout: report membership for group with address 224.0.0.251 on
> if 24000234
> MDNS: Responding with A record
> MDNS: Responding with SRV record
> MDNS: Responding with TXT record
> MDNS: Sending packet, len=106, unicast=0
> MDNS: Responding with A record
> MDNS: Responding with SRV record
> MDNS: Responding with TXT record
> MDNS: Sending packet, len=106, unicast=0
> MDNS: Responding with A record
> MDNS: Responding with SRV record
> MDNS: Responding with TXT record
> MDNS: Sending packet, len=106, unicast=0
> MDNS: Responding with A record
> MDNS: Responding with v4 PTR record
> MDNS: Responding with service type PTR record
> MDNS: Responding with service name PTR record
> MDNS: Responding with SRV record
> MDNS: Responding with TXT record
> MDNS: Sending packet, len=184, unicast=0
> mdns status[netif 0]: 1
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