ESP8266 Community Forum

I'd recommend using the NON-OS SDK instead. That might give you a change to leverage some overhead. But don't use the espconn functions but call LWIP directly. If you do, you may be able to get it quite efficient.

Thanks or your answer.
Are the I2C functions in NON-OS like the SDK ones?.
I mean, I use this to read I2C in SDK:

cmd = i2c_cmd_link_create();
i2c_master_start(cmd);
i2c_master_write_byte(cmd, ADC_SENSOR_ADDR << 1 | READ_BIT, ACK_CHECK_EN);
i2c_master_read(cmd, data, data_len, LAST_NACK_VAL);
i2c_master_stop(cmd);
ret = i2c_master_cmd_begin(i2c_num, cmd, 1000 / portTICK_RATE_MS);
i2c_cmd_link_delete(cmd);

but if i remember correctly I couldn't find similar ones in NON-OS.
By collecting 8 samples form ADC and sending them in a single UDP message I'm able to reach the SPS i need,but the system constantly crashes in less than a minute,and reboots.

The crash is probably caused by something taking to long to finish... sprinkle in some yields() and see if that helps, when I was using ESP8266 this helped a lot... now I am all ESP32...

RichardS