ESP32 Forum

Posted: **Wed Apr 15, 2020 11:42 am**

Using v4.1-dev-2079-g5dbabae9d (SHA-1: 5dbabae9dc32da3e639a0531b5337848a9e3317a)

When Ethernet is disconnected it appears that the mDNS component will work itself into a blocked state (runs out of TX buffer) a few minutes after disconnection.
The obvious answer seemed to be to call mdns_free() from ETHERNET_EVENT_DISCONNECTED and mdns_init() from ETHERNET_EVENT_CONNECTED
Calling mdns_free() from the event loop causes an exception (always corrupted) however:

Code: Select all

Guru Meditation Error: Core  0 panic'ed (InstrFetchProhibited). Exception was unhandled.
Core 0 register dump:
PC      : 0x3ffe358c  PS      : 0x00060530  A0      : 0x801a0bf9  A1      : 0x3ffbdff0
A2      : 0x3ffbd18c  A3      : 0x3ffe31f4  A4      : 0x00000001  A5      : 0x3f41b998
A6      : 0x00000003  A7      : 0x3ffc38d8  A8      : 0x801a1049  A9      : 0x3ffbdfd0
A10     : 0x00000000  A11     : 0x3f41b998  A12     : 0x00000003  A13     : 0x3ffc38d8
A14     : 0x00000000  A15     : 0x3ffbd468  SAR     : 0x00000004  EXCCAUSE: 0x00000014
EXCVADDR: 0x3ffe358c  LBEG    : 0x4000c2e0  LEND    : 0x4000c2f6  LCOUNT  : 0xffffffff

ELF file SHA256: 6254e987019a6ff52206d792cafb78006f208acc7612c41c605c4e29a692b1b7

Backtrace: 0x3ffe3589:0x3ffbdff0 |<-CORRUPTED

I have increased 'sys_evt' stack to same size as main (8K) but no help.
I can call mdns_free() from main though.

What am I missing? What else do I need to increase? Why cannot I call from sys_evt?
PS
It may also help to clarify how an application is supposed to behave with CONNECTED and DISCONNECTED events.

ESP32 Forum

esp_event_loop & ethernet events

esp_event_loop & ethernet events