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Hello BSTRobin, thank you for your reply. The changes you suggested seem to work, as the sensor is already running for several hours. However it still resets the iaq_acc values everytime I start a LoRaWAN transmission. All values are defined as static, therefore it should not reset after performing a LoRaWAN  Here is the code I use:   //Main loop for BME680 measurements if ((ret.bme680_status == 0) && (ret.bsec_status == 0)) { // PDEBUG("intialize BSEC library successful\r\n"); /* Call to endless loop function which reads and processes data based on sensor settings */ /* State is saved every 10.000 samples, which means every 10.000 * 3 secs = 500 minutes */ while (1) { bsec_iot_loop(sleep, get_timestamp_us, output_ready, state_save, 10000); HAL_GPIO_TogglePin(LED_0_GPIO_Port, LED_0_Pin); if (lora_timer > tx_intervall_LoRa * 1000) { start_lora(my_data, data_len); lora_timer = 0; } }   Meanwhile I changed the bsec_iot_loop to    void bsec_iot_loop(sleep_fct sleep, get_timestamp_us_fct get_timestamp_us, output_ready_fct output_ready, state_save_fct state_save, uint32_t save_intvl) { /* Timestamp variables */ int64_t static time_stamp = 0; int64_t static time_stamp_interval_ms = 0; /* Allocate enough memory for up to BSEC_MAX_PHYSICAL_SENSOR physical inputs*/ bsec_input_t static bsec_inputs[BSEC_MAX_PHYSICAL_SENSOR]; /* Number of inputs to BSEC */ uint8_t static num_bsec_inputs = 0; /* BSEC sensor settings struct */ bsec_bme_settings_t static sensor_settings; /* Save state variables */ uint8_t static bsec_state[BSEC_MAX_STATE_BLOB_SIZE]; uint8_t static work_buffer[BSEC_MAX_WORKBUFFER_SIZE]; uint32_t static bsec_state_len = 0; uint32_t static n_samples = 0; bsec_library_return_t static bsec_status = BSEC_OK; // while (1) // { /* get the timestamp in nanoseconds before calling bsec_sensor_control() */ time_stamp = get_timestamp_us() * 1000; /* Retrieve sensor settings to be used in this time instant by calling bsec_sensor_control */ bsec_sensor_control(time_stamp, &sensor_settings); /* Trigger a measurement if necessary */ bme680_bsec_trigger_measurement(&sensor_settings, sleep); /* Read data from last measurement */ num_bsec_inputs = 0; bme680_bsec_read_data(time_stamp, bsec_inputs, &num_bsec_inputs, sensor_settings.process_data); /* Time to invoke BSEC to perform the actual processing */ bme680_bsec_process_data(bsec_inputs, num_bsec_inputs, output_ready); /* Increment sample counter */ n_samples++; /* Retrieve and store state if the passed save_intvl */ if (n_samples >= save_intvl) { bsec_status = bsec_get_state(0, bsec_state, sizeof(bsec_state), work_buffer, sizeof(work_buffer), &bsec_state_len); if (bsec_status == BSEC_OK) { state_save(bsec_state, bsec_state_len); } n_samples = 0; } /* Compute how long we can sleep until we need to call bsec_sensor_control() next */ /* Time_stamp is converted from microseconds to nanoseconds first and then the difference to milliseconds */ time_stamp_interval_ms = (sensor_settings.next_call - get_timestamp_us() * 1000) / 1000000; if (time_stamp_interval_ms > 0) { sleep((uint32_t)time_stamp_interval_ms); } // } }       so it will eventually leave the original loop to check, if it's ready to transmit data via LoRa. After every transmission, the stat_iaq resets and I cannot figure out why.   Thank you in advance. ... View more

Hello BSTRobin,   I will try it out as soon as possible! Thank you very much for the fast reply.   Edit: Thank you, worked just fine!  ... View more