Bluetooth SPP profile fails after some time

squonk11
Posts: 63
Joined: Wed Mar 01, 2017 6:53 pm
Location: Germany

Bluetooth SPP profile fails after some time

Postby squonk11 » Mon Mar 04, 2019 8:00 pm

I am trying to set up a simple bluetooth SPP profile communication with an industrial device via a serial interface. For this I am basically using the example from the BT-SPP-ACCEPTOR demo. Using this I am transferring short data frames in an inquiry and reply manner. Initially this works but after some time (e.g. 20seconds) I get error messages from the BT stack like:
E (31115) BT_OSI: alarm_set failed to start timer, err 0x103
These messages appear from time to time while the BT communication continues.
Unfortunately after some more time (e.g. 2 minutes) the ESP32 crashes with the error message:
ASSERT_ERR(0), in lc_lmppdu.c at line 66
Guru Meditation Error: Core 0 panic'ed (Interrupt wdt timeout on CPU0)
Core 0 register dump:
PC : 0x40086314 PS : 0x00060134 A0 : 0x8001c21a A1 : 0x3ffcec30
This is a log of the error messages only:
This is ESP32 chip with 2 CPU cores, WiFi/BT/BLE, silicon revision 1, 4MB external flash
ESP-IDF Version: v3.3-beta1-136-g97eecfa1b
W (12942) BT_APPL: new conn_srvc id:26, app_id:255
E (16538) BT_OSI: alarm_set failed to start timer, err 0x103

E (38741) BT_OSI: alarm_set failed to start timer, err 0x103

E (62163) BT_OSI: alarm_set failed to start timer, err 0x103

E (84275) BT_OSI: alarm_set failed to start timer, err 0x103

E (106456) BT_OSI: alarm_set failed to start timer, err 0x103

E (128690) BT_OSI: alarm_set failed to start timer, err 0x103

ASSERT_ERR(0), in lc_lmppdu.c at line 66
Guru Meditation Error: Core 0 panic'ed (Interrupt wdt timeout on CPU0)
I monitored this behaviour now many times. It is always the same picture: the error "err 0x103" appears roughly every 23 seconds and after the 6th time the ESP32 crashes.

Does someone have any idea where this comes from? What shall I do?
"Wer glaubt etwas zu sein hat aufgehört etwas zu werden"
Sokrates

squonk11
Posts: 63
Joined: Wed Mar 01, 2017 6:53 pm
Location: Germany

Re: Bluetooth SPP profile fails after some time

Postby squonk11 » Wed Mar 06, 2019 9:31 pm

Does nobody have an idea how to solve this issue?
"Wer glaubt etwas zu sein hat aufgehört etwas zu werden"
Sokrates

louisthetall
Posts: 6
Joined: Thu Jan 04, 2018 8:36 pm

Re: Bluetooth SPP profile fails after some time

Postby louisthetall » Wed Sep 25, 2019 2:20 pm

I am running into a similar issue, although it is not happening as frequently to me.

Have you had any luck in trying to resolve this issue?

squonk11
Posts: 63
Joined: Wed Mar 01, 2017 6:53 pm
Location: Germany

Re: Bluetooth SPP profile fails after some time

Postby squonk11 » Wed Sep 25, 2019 7:40 pm

With the latest version of esp-idf it seems to work (at least much better than before). But maybe I changed something unintentionally. One difference I have compared to my previous version that now freertos is working at 10ms and not at 1ms (like before). But I don't know if this is makes the difference.
"Wer glaubt etwas zu sein hat aufgehört etwas zu werden"
Sokrates

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