BME680: init problem after reboot

[micha_pr]

it seems there may occur a problem while init after restarting sensor.

Following situation:
Sensor was running a long time (3 weeks, last time block 28266 seconds - about 8 hours) in outdoor environment.
Was stable and bad air was detected.
There was a situation with very poor air quality (smoke from stove heaters or open fire has polluted the air) - that's why the values here were bad.

In this situation the WiFi connection was lost and ESP was restarted (by program).
BME did not initialize full - the IAQ and TVOC values did not change more from default values, only the resistance was changing after restart.

Time,            Timestamp, gas/Ohm, IAQ,  IAQ accur., temp/°C, hum./%, staticIaq, co2Eq., VocEq.
Feb 23 21:43:34  .28257914, 103753, 306.28, 2.00,     -1.20,   66.22,   723.24,   7232.40, 1000.00 
Feb 23 21:43:37  .28260914, 103755, 305.96, 2.00,     -1.20,   66.28,   722.44,   7224.43, 1000.00 
Feb 23 21:43:40  .28263914, 103754, 305.67, 2.00,     -1.20,   66.31,   721.72,   7217.27, 1000.00 
Feb 23 21:43:43  .28266914, 103755, 306.10, 2.00,     -1.20,   66.35,   722.79,   7227.91, 1000.00 
Feb 23 21:43:48  . client connection failed (1) - restart
Feb 23 21:43:57  .Begin (setup)
Feb 23 21:43:58  .2980,     103753, 25.00,  0.00,      -1.25,  66.32,     25.00,   500.00, 0.49
Feb 23 21:44:01  .5979,     103752, 25.00,  0.00,      -1.30,  66.64,     25.00,   500.00, 0.49
Feb 23 21:44:04  .8980,     103754, 25.00,  0.00,      -1.28,  66.61,     25.00,   500.00, 0.49
....
Feb 24 02:40:22  .17786979, 103697, 25.00,  1.00,      -1.64,  74.48,     25.00,   500.00, 0.49
Feb 24 02:40:25  .17789980, 103696, 25.00,  1.00,      -1.64,  74.45,     25.00,   500.00, 0.49
Feb 24 02:40:30  . client connection failed (1) - restart
Feb 24 02:40:36  .Begin (setup)
Feb 24 02:40:37  .2981,     103696, 25.00,  0.00,      -1.65,  74.20,     25.00,   500.00, 0.49 
Feb 24 02:40:40  .5980,     103696, 25.00,  0.00,      -1.69,  74.53,     25.00,   500.00, 0.49 
....
Feb 24 08:10:37  .19803337, 103565, 25.00,  1.00,      -1.02,  73.23,     25.00,   500.00, 0.49 
Feb 24 08:10:40  .19806337, 103565, 25.00,  1.00,      -1.01,  73.22,     25.00,   500.00, 0.49

A second restart did not help (OA update with restart):

Time,            Timestamp, gas/Ohm, IAQ,  IAQ accur., temp/°C, hum./%, staticIaq, co2Eq., VocEq.
Feb 24 08:10:40  .19806337, 103565, 25.00,  1.00,      -1.01,  73.22,     25.00,   500.00, 0.49 
Feb 24 08:10:41  .Begin OTA
Feb 24 08:10:49  .End OTA
Feb 24 08:10:59  .Begin (setup)
Feb 24 08:10:59  .9595,     103564, 25.00,  0.00,      -1.00,  73.27,     25.00,   500.00, 0.49 
Feb 24 08:11:02  .12595,    103564, 25.00,  0.00,      -1.05,  73.57,     25.00,   500.00, 0.49 
....
Feb 24 08:30:11  .1161594,  103586, 25.00,  1.00,      -0.36,  71.65,     25.00,   500.00, 0.49 
Feb 24 08:30:14  .1164595,  103585, 25.00,  1.00,      -0.35,  71.62,     25.00,   500.00, 0.49 
....

Only after power off/power on the sensor was working again as expected:

Time,            Timestamp, gas/Ohm, IAQ,  IAQ accur., temp/°C, hum./%, staticIaq, co2Eq., VocEq.
Feb 24 08:42:21  .Begin (setup)
Feb 24 08:42:21  .#012BSEC library version 1.4.7.1
Feb 24 08:42:22  .3046,    103600,  25.00,  0.00,       0.19,  68.79,     25.00,   500.00, 0.49 
Feb 24 08:42:25  .6046,    103600,  25.00,  0.00,       0.16,  69.02,     25.00,   500.00, 0.49 
....
Feb 24 08:47:25  .306046,  103596,  25.00,  1.00,       0.48,  67.29,     25.00,   500.00, 0.49 
Feb 24 08:47:28  .309046,  103598,  26.10,  1.00,       0.48,  67.22,     25.48,   501.92, 0.50 
Feb 24 08:47:31  .312046,  103596,  28.21,  1.00,       0.47,  67.17,     26.40,   505.61, 0.51 
Feb 24 08:47:34  .315046,  103597,  29.10,  1.00,       0.48,  67.07,     26.79,   507.17, 0.51 

Is there any additional reset command what can be used instead of a physical power down?
BTW - the sensor did make the restarts before (about 2 weeks) fine, I have seen the restarts of the ESP in log.
I do not use the config_save/config_load functions.

[kgoveas]

Hi,

Have you already tried the soft reset function?

Regards,

kgoveas

[micha_pr]

No, haven't tried.
You know - try and error cost a lot of time with such kind of errors 😉
The sensor was working several months without this init problem - it was first time. So not sure when it will come up next time 🙂

if restarting the sensor with begin() - the soft_reset is included, right?
This was executed while restarting the ESP

[o_o]

---

@micha_pr wrote:

if restarting the sensor with begin() - the soft_reset is included, right?

---

Our sensor driver does not contain a "begin()" function, but the soft reset is included in the bme680_init function.

[micha_pr]

I mean the

iaqSensor.begin(BME680_I2C_ADDR_PRIMARY, Wire);

from your sample.

Have you any idea about the issue itself?

Thanks!