mdns query with custom netif (IDFGH-13551)

[archef2000]

Answers checklist.

• I have read the documentation for esp-protocols components and the issue is not addressed there.
• I have updated my esp-protocols branch (master or release) to the latest version and checked that the issue is present there.
• I have searched the issue tracker for a similar issue and not found a similar issue.

General issue report

I have created a custom esp netif for Apple wireless direct link. Implementation here
Now I am trying to query for the airdrop service of other iPhones.

After I init the netif and registerd it with mdns i query for airdrop here:
/main/wifi/capture.c#L233

But It does not send any udp packet to the custom inetif and also does not find any records.

What are all the required steps for a netif to be seen ready, valid and etc for mdns to send query packets?

Log

E (21156) awdl: mdns_query_task
I (21156) custom_netif_example: Query PTR: _airdrop._tcp.local
I (21156) _mdns_send_search_action: queue send
I (21156) _mdns_execute_action: 3
I (21256) _mdns_send_search_action: queue send
I (21256) _mdns_execute_action: 4
I (21256) _mdns_search_send_pcb: mdns_is_netif_ready 0
I (21256) _mdns_search_send_pcb: mdns_is_netif_ready 0
I (21266) _mdns_search_send_pcb: mdns_is_netif_ready 0
I (21266) _mdns_search_send_pcb: mdns_is_netif_ready 0
I (21276) _mdns_search_send_pcb: mdns_is_netif_ready 0
I (21276) _mdns_search_send_pcb: mdns_is_netif_ready 0
D (21466) lwip: etharp_timer

D (21466) lwip: dhcp_coarse_tmr()

I (22356) _mdns_send_search_action: queue send
I (22356) _mdns_execute_action: 4
I (22356) _mdns_search_send_pcb: mdns_is_netif_ready 0
I (22356) _mdns_search_send_pcb: mdns_is_netif_ready 0
I (22366) _mdns_search_send_pcb: mdns_is_netif_ready 0
I (22366) _mdns_search_send_pcb: mdns_is_netif_ready 0
I (22376) _mdns_search_send_pcb: mdns_is_netif_ready 0
I (22376) _mdns_search_send_pcb: mdns_is_netif_ready 0
D (22466) lwip: etharp_timer

D (22466) lwip: dhcp_coarse_tmr()

I (23456) _mdns_send_search_action: queue send
I (23456) _mdns_execute_action: 4
I (23456) _mdns_search_send_pcb: mdns_is_netif_ready 0
I (23456) _mdns_search_send_pcb: mdns_is_netif_ready 0
D (23466) lwip: etharp_timer

I (23466) _mdns_search_send_pcb: mdns_is_netif_ready 0
D (23466) lwip: dhcp_coarse_tmr()

I (23476) _mdns_search_send_pcb: mdns_is_netif_ready 0
I (23486) _mdns_search_send_pcb: mdns_is_netif_ready 0
I (23486) _mdns_search_send_pcb: mdns_is_netif_ready 0
I (24256) _mdns_send_search_action: queue send
I (24256) _mdns_execute_action: 5
W (24256) custom_netif_example: No results found!
D (24466) lwip: etharp_timer

D (24466) lwip: dhcp_coarse_tmr()

E (25256) awdl: mdns_query_task
I (25256) custom_netif_example: Query PTR: _airdrop._tcp.local
I (25256) _mdns_send_search_action: queue send
I (25256) _mdns_execute_action: 3
I (25356) _mdns_send_search_action: queue send
I (25356) _mdns_execute_action: 4
I (25356) _mdns_search_send_pcb: mdns_is_netif_ready 0
I (25356) _mdns_search_send_pcb: mdns_is_netif_ready 0
I (25366) _mdns_search_send_pcb: mdns_is_netif_ready 0
I (25366) _mdns_search_send_pcb: mdns_is_netif_ready 0
I (25376) _mdns_search_send_pcb: mdns_is_netif_ready 0
I (25376) _mdns_search_send_pcb: mdns_is_netif_ready 0

[david-cermak]

Hi @archef2000

You'd have to register the interface and enable it for specific IP protocols v4, v6 or both:

esp-protocols/components/mdns/examples/query_advertise/main/mdns_example_main.c

Lines 326 to 334 in 73c4830

	/* Demonstration of adding a custom netif to mdns service, but we're adding the default example one,
	* so we must disable all predefined interfaces (PREDEF_NETIF_STA, AP and ETH) first
	*/
	ESP_ERROR_CHECK(mdns_register_netif(EXAMPLE_INTERFACE));
	/* It is not enough to just register the interface, we have to enable is manually.
	* This is typically performed in "GOT_IP" event handler, but we call it here directly
	* since the `EXAMPLE_INTERFACE` netif is connected already, to keep the example simple.
	*/
	ESP_ERROR_CHECK(mdns_netif_action(EXAMPLE_INTERFACE, MDNS_EVENT_ENABLE_IP4 | MDNS_EVENT_ENABLE_IP6));

If you're also advertizing, you'd also need to send announcements:

esp-protocols/components/mdns/examples/query_advertise/main/mdns_example_main.c

Line 335 in 73c4830

ESP_ERROR_CHECK(mdns_netif_action(EXAMPLE_INTERFACE, MDNS_EVENT_ANNOUNCE_IP4 | MDNS_EVENT_ANNOUNCE_IP6));

(not necessary if you're just querying)

[archef2000]

Thanks for the quick answer when running the code (Added on line 335 in capture.c) I get the following error when adding the events for IP6 & IP4: 103 ESP_ERR_INVALID_STATE

[david-cermak]

What's the number of configured interfaces in mdns Kconifg?

CONFIG_MDNS_MAX_INTERFACES

This is 3 by default, but also 3 predefined interfaces are enabled, so there's probably no space for a another one by default.
you can either increase the CONFIG_MDNS_MAX_INTERFACES or disable one of the predefined
(or disable everything if you just need the mdns for the lowpan6_ble_netif)

[archef2000]

Oh thanks I disabled the default interfaces to solve the invalid state error. Here is the new log where after 2-3 Query attempts it stops to send out packets and lwip is just doing some minimal packet handeling after that.

Log

I (606) aw�l: mac: 80:65:99:c7:ae:98
I (606) awdl core: switch channel to 6 (slot 0)
psf�time� int�rval us: 112640
E (616) wifi:failed to post WiFi eve�t=40 ret=259
� (626) awdl: (aw�l_cr�ate) creati�g awdl driver
aw�l_post_attach
a�dl_n�tif_init
E (636) awdl: mdns_query_task�igmp_joingroup_netif: attempt to join on non-IGMP netif
I (646) main_task: Returned from app_main()
D (646) lwip: pbuf_alloc(length=32)

D (646) lwip: pbuf_alloc(length=32) == 0x3fca4034

D (656) lwip: pbuf_remove_header: old 0x3fca407c new 0x3fca4084 (8)

D (656) lwip: pbuf_add_header: old 0x3fca4084 new 0x3fca407c (8)

D (666) lwip: pbuf_add_header: old 0x3fca407c new 0x3fca4054 (40)

D (666) lwip: ip6_output_if: ow1

D (676) lwip: IPv6 header:

D (676) lwip: +-------------------------------+

D (676) lwip: |  6 |    0  |            0     | (ver, class, flow)

D (686) lwip: +-------------------------------+

D (696) lwip: |        32     |    0  |    1  | (plen, nexth, hopl)

D (696) lwip: +-------------------------------+

D (706) lwip: |     0 |     0 |     0 |     0 | (src)

D (706) lwip: |     0 |     0 |     0 |     0 |

D (716) lwip: +-------------------------------+

D (716) lwip: |  ff02 |     0 |     0 |     0 | (dest)

D (726) lwip: |     0 |     0 |     0 |    fb |

D (726) lwip: +-------------------------------+

D (726) lwip: netif->output_ip6()

awdl_output ->linkoutput; q->len=72
60 00 00 00 00 20 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ff 02 00 00 00 00 00 00 00 00 00 00 00 00 00 fb 3a 00 05 02 00 00 01 00 83 00 7c b1 00 00 00 00 ff 02 00 00 00 00 00 00 00 00 00 00 00 00 00 fb
awdl_netif_linkoutput -> esp_netif_transmit -> driver->transmit (awdl_transmit)
awdl_transmit
60 00 00 00 00 20 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ff 02 00 00 00 00 00 00 00 00 00 00 00 00 00 fb 3a 00 05 02 00 00 01 00 83 00 7c b1 00 00 00 00 ff 02 00 00 00 00 00 00 00 00 00 00 00 00 00 fb
D (776) lwip: pbuf_free(0x3fca4034)

D (786) lwip: pbuf_free: deallocating 0x3fca4034

D (786) lwip: udp_bind(ipaddr =
D (796) lwip: 0.0.0.0
D (796) lwip: , port = 5353)

D (796) lwip: udp_bind: bound to
D (796) lwip: 0.0.0.0
D (806) lwip: , port 5353)


TX[0][1]: To: ff02:0000:0000:0000:0000:0000:0000:00fb:5353, Packet[390]:
    Q: *U* ._airdrop._tcp.local. PTR IN
D (836) lwip: pbuf_alloc(length=37)

D (836) lwip: pbuf_alloc(length=37) == 0x3fca40d0

D (836) lwip: pbuf_free(0x3fca40d0)

D (846) lwip: pbuf_free: deallocating 0x3fca40d0

D (886) lwip: pbuf_alloc(length=32)

D (886) lwip: pbuf_alloc(length=32) == 0x3fca4088

D (886) lwip: pbuf_remove_header: old 0x3fca40d0 new 0x3fca40d8 (8)

D (886) lwip: pbuf_add_header: old 0x3fca40d8 new 0x3fca40d0 (8)

D (886) lwip: pbuf_add_header: old 0x3fca40d0 new 0x3fca40a8 (40)

D (896) lwip: ip6_output_if: ow1

D (896) lwip: IPv6 header:

D (906) lwip: +-------------------------------+

D (906) lwip: |  6 |    0  |            0     | (ver, class, flow)

D (916) lwip: +-------------------------------+

D (916) lwip: |        32     |    0  |    1  | (plen, nexth, hopl)

D (926) lwip: +-------------------------------+

D (926) lwip: |     0 |     0 |     0 |     0 | (src)

D (936) lwip: |     0 |     0 |     0 |     0 |

D (936) lwip: +-------------------------------+

D (946) lwip: |  ff02 |     0 |     0 |     0 | (dest)

D (946) lwip: |     0 |     0 |     0 |    fb |

D (956) lwip: +-------------------------------+

D (956) lwip: netif->output_ip6()

awdl_output ->linkoutput; q->len=72
60 00 00 00 00 20 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ff 02 00 00 00 00 00 00 00 00 00 00 00 00 00 fb 3a 00 05 02 00 00 01 00 83 00 7c b1 00 00 00 00 ff 02 00 00 00 00 00 00 00 00 00 00 00 00 00 fb
awdl_netif_linkoutput -> esp_netif_transmit -> driver->transmit (awdl_transmit)
awdl_transmit
60 00 00 00 00 20 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ff 02 00 00 00 00 00 00 00 00 00 00 00 00 00 fb 3a 00 05 02 00 00 01 00 83 00 7c b1 00 00 00 00 ff 02 00 00 00 00 00 00 00 00 00 00 00 00 00 fb
D (1006) lwip: pbuf_free(0x3fca4088)

D (1006) lwip: pbuf_free: deallocating 0x3fca4088

D (1466) lwip: etharp_timer

D (1466) lwip: dhcp_coarse_tmr()

D (1466) lwip: pbuf_alloc(length=16)

D (1466) lwip: pbuf_alloc(length=16) == 0x3fca4088

D (1466) lwip: pbuf_add_header: old 0x3fca40d0 new 0x3fca40a8 (40)

D (1476) lwip: ip6_output_if: lo0

D (1476) lwip: IPv6 header:

D (1476) lwip: +-------------------------------+

D (1486) lwip: |  6 |    0  |            0     | (ver, class, flow)

D (1486) lwip: +-------------------------------+

D (1496) lwip: |        16     |   58  |  255  | (plen, nexth, hopl)

D (1496) lwip: +-------------------------------+

D (1506) lwip: |     0 |     0 |     0 |     0 | (src)

D (1506) lwip: |     0 |     0 |     0 |     1 |

D (1516) lwip: +-------------------------------+

D (1516) lwip: |  ff02 |     0 |     0 |     0 | (dest)

D (1526) lwip: |     0 |     0 |     0 |     2 |

D (1526) lwip: +-------------------------------+

D (1536) lwip: netif->output_ip6()

D (1536) lwip: pbuf_alloc(length=56)

D (1536) lwip: pbuf_alloc(length=56) == 0x3fca40e4

D (1546) lwip: pbuf_copy(0x3fca40e4, 0x3fca4088)

D (1546) lwip: pbuf_copy_partial_pbuf(0x3fca40e4, 0x3fca4088, 56, 0)

D (1556) lwip: pbuf_copy_partial_pbuf: copy complete.

D (1556) lwip: pbuf_free(0x3fca4088)

D (1566) lwip: pbuf_free: deallocating 0x3fca4088

is multicast 1
multicast address ff020000 0 0 2
iflocal: 0
linklocal: 0
mld6 group 0
D (1576) lwip: ip6_input: packet not for us.

D (1576) lwip: pbuf_free(0x3fca40e4)

D (1586) lwip: pbuf_free: deallocating 0x3fca40e4


TX[0][1]: To: ff02:0000:0000:0000:0000:0000:0000:00fb:5353, Packet[1490]:
    Q: *U* ._airdrop._tcp.local. PTR IN
D (1936) lwip: pbuf_alloc(length=37)

D (1936) lwip: pbuf_alloc(length=37) == 0x3fca40a8

D (1936) lwip: pbuf_free(0x3fca40a8)

D (1946) lwip: pbuf_free: deallocating 0x3fca40a8

D (2466) lwip: etharp_timer

D (2466) lwip: dhcp_coarse_tmr()


TX[0][1]: To: ff02:0000:0000:0000:0000:0000:0000:00fb:5353, Packet[2590]:
    Q: *U* ._airdrop._tcp.local. PTR IN
D (3036) lwip: pbuf_alloc(length=37)

D (3036) lwip: pbuf_alloc(length=37) == 0x3fca40a8

D (3036) lwip: pbuf_free(0x3fca40a8)

D (3046) lwip: pbuf_free: deallocating 0x3fca40a8

D (3466) lwip: etharp_timer

D (3466) lwip: dhcp_coarse_tmr()

W (3736) custom_netif_example: No results found!
D (4466) lwip: etharp_timer

D (4466) lwip: dhcp_coarse_tmr()

E (4736) awdl: mdns_query_task
I (4736) custom_netif_example: Query PTR: _airdrop._tcp.local

TX[0][1]: To: ff02:0000:0000:0000:0000:0000:0000:00fb:5353, Packet[4390]:
    Q: *U* ._airdrop._tcp.local. PTR IN
D (4836) lwip: pbuf_alloc(length=37)

D (4836) lwip: pbuf_alloc(length=37) == 0x3fca40a8

D (4836) lwip: pbuf_free(0x3fca40a8)

D (4846) lwip: pbuf_free: deallocating 0x3fca40a8

D (5466) lwip: etharp_timer

D (5466) lwip: dhcp_coarse_tmr()

D (5466) lwip: pbuf_alloc(length=16)

D (5466) lwip: pbuf_alloc(length=16) == 0x3fca4088

D (5466) lwip: pbuf_add_header: old 0x3fca40d0 new 0x3fca40a8 (40)

D (5476) lwip: ip6_output_if: lo0

D (5476) lwip: IPv6 header:

D (5476) lwip: +-------------------------------+

D (5486) lwip: |  6 |    0  |            0     | (ver, class, flow)

D (5486) lwip: +-------------------------------+

D (5496) lwip: |        16     |   58  |  255  | (plen, nexth, hopl)

D (5496) lwip: +-------------------------------+

D (5506) lwip: |     0 |     0 |     0 |     0 | (src)

D (5506) lwip: |     0 |     0 |     0 |     1 |

D (5516) lwip: +-------------------------------+

D (5516) lwip: |  ff02 |     0 |     0 |     0 | (dest)

D (5526) lwip: |     0 |     0 |     0 |     2 |

D (5526) lwip: +-------------------------------+

D (5536) lwip: netif->output_ip6()

D (5536) lwip: pbuf_alloc(length=56)

D (5536) lwip: pbuf_alloc(length=56) == 0x3fca40e4

D (5546) lwip: pbuf_copy(0x3fca40e4, 0x3fca4088)

D (5546) lwip: pbuf_copy_partial_pbuf(0x3fca40e4, 0x3fca4088, 56, 0)

D (5556) lwip: pbuf_copy_partial_pbuf: copy complete.

D (5556) lwip: pbuf_free(0x3fca4088)

D (5566) lwip: pbuf_free: deallocating 0x3fca4088

is multicast 1
multicast address ff020000 0 0 2
iflocal: 0
linklocal: 0
mld6 group 0
D (5576) lwip: ip6_input: packet not for us.

D (5576) lwip: pbuf_free(0x3fca40e4)

D (5586) lwip: pbuf_free: deallocating 0x3fca40e4


TX[0][1]: To: ff02:0000:0000:0000:0000:0000:0000:00fb:5353, Packet[5490]:
    Q: *U* ._airdrop._tcp.local. PTR IN
D (5936) lwip: pbuf_alloc(length=37)

D (5936) lwip: pbuf_alloc(length=37) == 0x3fca40d0

D (5936) lwip: pbuf_free(0x3fca40d0)

D (5946) lwip: pbuf_free: deallocating 0x3fca40d0

D (6466) lwip: etharp_timer

D (6466) lwip: dhcp_coarse_tmr()


TX[0][1]: To: ff02:0000:0000:0000:0000:0000:0000:00fb:5353, Packet[6590]:
    Q: *U* ._airdrop._tcp.local. PTR IN
D (7036) lwip: pbuf_alloc(length=37)

D (7036) lwip: pbuf_alloc(length=37) == 0x3fca40d0

D (7036) lwip: pbuf_free(0x3fca40d0)

D (7046) lwip: pbuf_free: deallocating 0x3fca40d0

D (7466) lwip: etharp_timer

D (7466) lwip: dhcp_coarse_tmr()

W (7836) custom_netif_example: No results found!
D (8466) lwip: etharp_timer

D (8466) lwip: dhcp_coarse_tmr()

E (8836) awdl: mdns_query_task
I (8836) custom_netif_example: Query PTR: _airdrop._tcp.local

TX[0][1]: To: ff02:0000:0000:0000:0000:0000:0000:00fb:5353, Packet[8490]:
    Q: *U* ._airdrop._tcp.local. PTR IN
D (8936) lwip: pbuf_alloc(length=37)

D (8936) lwip: pbuf_alloc(length=37) == 0x3fca40f0

D (8936) lwip: pbuf_free(0x3fca40f0)

D (8946) lwip: pbuf_free: deallocating 0x3fca40f0

D (9466) lwip: etharp_timer

D (9466) lwip: dhcp_coarse_tmr()

D (9466) lwip: pbuf_alloc(length=16)

D (9466) lwip: pbuf_alloc(length=16) == 0x3fca4088

D (9466) lwip: pbuf_add_header: old 0x3fca40d0 new 0x3fca40a8 (40)

D (9476) lwip: ip6_output_if: lo0

D (9476) lwip: IPv6 header:

D (9476) lwip: +-------------------------------+

D (9486) lwip: |  6 |    0  |            0     | (ver, class, flow)

D (9486) lwip: +-------------------------------+

D (9496) lwip: |        16     |   58  |  255  | (plen, nexth, hopl)

D (9496) lwip: +-------------------------------+

D (9506) lwip: |     0 |     0 |     0 |     0 | (src)

D (9506) lwip: |     0 |     0 |     0 |     1 |

D (9516) lwip: +-------------------------------+

D (9516) lwip: |  ff02 |     0 |     0 |     0 | (dest)

D (9526) lwip: |     0 |     0 |     0 |     2 |

D (9526) lwip: +-------------------------------+

D (9536) lwip: netif->output_ip6()

D (9536) lwip: pbuf_alloc(length=56)

D (9536) lwip: pbuf_alloc(length=56) == 0x3fca40e4

D (9546) lwip: pbuf_copy(0x3fca40e4, 0x3fca4088)

D (9546) lwip: pbuf_copy_partial_pbuf(0x3fca40e4, 0x3fca4088, 56, 0)

D (9556) lwip: pbuf_copy_partial_pbuf: copy complete.

D (9556) lwip: pbuf_free(0x3fca4088)

D (9566) lwip: pbuf_free: deallocating 0x3fca4088

is multicast 1
multicast address ff020000 0 0 2
iflocal: 0
linklocal: 0
mld6 group 0
D (9576) lwip: ip6_input: packet not for us.

D (9576) lwip: pbuf_free(0x3fca40e4)

D (9586) lwip: pbuf_free: deallocating 0x3fca40e4


TX[0][1]: To: ff02:0000:0000:0000:0000:0000:0000:00fb:5353, Packet[9590]:
    Q: *U* ._airdrop._tcp.local. PTR IN
D (10036) lwip: pbuf_alloc(length=37)

D (10036) lwip: pbuf_alloc(length=37) == 0x3fca4104

D (10036) lwip: pbuf_free(0x3fca4104)

D (10046) lwip: pbuf_free: deallocating 0x3fca4104

D (10466) lwip: etharp_timer

D (10466) lwip: dhcp_coarse_tmr()


TX[0][1]: To: ff02:0000:0000:0000:0000:0000:0000:00fb:5353, Packet[10690]:
    Q: *U* ._airdrop._tcp.local. PTR IN
D (11136) lwip: pbuf_alloc(length=37)

D (11136) lwip: pbuf_alloc(length=37) == 0x3fca4098

D (11136) lwip: pbuf_free(0x3fca4098)

D (11146) lwip: pbuf_free: deallocating 0x3fca4098

D (11466) lwip: etharp_timer

D (11466) lwip: dhcp_coarse_tmr()

W (11936) custom_netif_example: No results found!
D (12466) lwip: etharp_timer

D (12466) lwip: dhcp_coarse_tmr()

E (12936) awdl: mdns_query_task
I (12936) custom_netif_example: Query PTR: _airdrop._tcp.local

TX[0][1]: To: ff02:0000:0000:0000:0000:0000:0000:00fb:5353, Packet[12590]:
    Q: *U* ._airdrop._tcp.local. PTR IN
D (13036) lwip: pbuf_alloc(length=37)

D (13036) lwip: pbuf_alloc(length=37) == 0x3fca40b8

D (13036) lwip: pbuf_free(0x3fca40b8)

D (13046) lwip: pbuf_free: deallocating 0x3fca40b8

D (13466) lwip: etharp_timer

D (13466) lwip: dhcp_coarse_tmr()


TX[0][1]: To: ff02:0000:0000:0000:0000:0000:0000:00fb:5353, Packet[13690]:
    Q: *U* ._airdrop._tcp.local. PTR IN
D (14136) lwip: pbuf_alloc(length=37)

D (14136) lwip: pbuf_alloc(length=37) == 0x3fca42d4

D (14136) lwip: pbuf_free(0x3fca42d4)

D (14146) lwip: pbuf_free: deallocating 0x3fca42d4

D (14466) lwip: etharp_timer

D (14466) lwip: dhcp_coarse_tmr()


TX[0][1]: To: ff02:0000:0000:0000:0000:0000:0000:00fb:5353, Packet[14790]:
    Q: *U* ._airdrop._tcp.local. PTR IN
D (15236) lwip: pbuf_alloc(length=37)

D (15236) lwip: pbuf_alloc(length=37) == 0x3fca4150

D (15236) lwip: pbuf_free(0x3fca4150)

D (15246) lwip: pbuf_free: deallocating 0x3fca4150

D (15466) lwip: etharp_timer

D (15466) lwip: dhcp_coarse_tmr()

W (16036) custom_netif_example: No results found!
D (16466) lwip: etharp_timer

D (16466) lwip: dhcp_coarse_tmr()

E (17036) awdl: mdns_query_task
I (17036) custom_netif_example: Query PTR: _airdrop._tcp.local

TX[0][1]: To: ff02:0000:0000:0000:0000:0000:0000:00fb:5353, Packet[16690]:
    Q: *U* ._airdrop._tcp.local. PTR IN
D (17136) lwip: pbuf_alloc(length=37)

D (17136) lwip: pbuf_alloc(length=37) == 0x3fca4170

D (17136) lwip: pbuf_free(0x3fca4170)

D (17146) lwip: pbuf_free: deallocating 0x3fca4170

D (17466) lwip: etharp_timer

D (17466) lwip: dhcp_coarse_tmr()


TX[0][1]: To: ff02:0000:0000:0000:0000:0000:0000:00fb:5353, Packet[17790]:
    Q: *U* ._airdrop._tcp.local. PTR IN
D (18236) lwip: pbuf_alloc(length=37)

D (18236) lwip: pbuf_alloc(length=37) == 0x3fca4170

D (18236) lwip: pbuf_free(0x3fca4170)

D (18246) lwip: pbuf_free: deallocating 0x3fca4170

D (18466) lwip: etharp_timer

D (18466) lwip: dhcp_coarse_tmr()


TX[0][1]: To: ff02:0000:0000:0000:0000:0000:0000:00fb:5353, Packet[18890]:
    Q: *U* ._airdrop._tcp.local. PTR IN
D (19336) lwip: pbuf_alloc(length=37)

D (19336) lwip: pbuf_alloc(length=37) == 0x3fca4180

D (19336) lwip: pbuf_free(0x3fca4180)

D (19346) lwip: pbuf_free: deallocating 0x3fca4180

D (19466) lwip: etharp_timer

D (19466) lwip: dhcp_coarse_tmr()

W (20136) custom_netif_example: No results found!

[david-cermak]

@archef2000 How exactly does your netif handle multicasts? I saw that you enabled NETIF_FLAG_MLD6 directly in lwip.

Is this lwip issue espressif/esp-lwip#72 related? I would guess some memory corruption is taking place in your netif while processing multicast packets.