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Dear BSTRobin I am getting IAQ reading now, but the accuracy stuck at 1 and never changes? ... View more

As a give back to the community, for anyone facing same issues, so basically to run BSEC library in deep sleep while switching of the uC completely (external RTC) you have to do the following: 1- Make sure to have save state and load state implemented correctly:   void state_save(const uint8_t *state_buffer, uint32_t length) { // ... // Save the string some form of non-volatile memory, if possible. // ... ESP_LOGI("BME680 - state_save", "Saving state: buffer-size %d", length ); nvs_handle_t my_handle; esp_err_t err = nvs_open("state", NVS_READWRITE, &my_handle); ESP_ERROR_CHECK(err); err = nvs_set_blob(my_handle, sensor_binary, state_buffer, length); ESP_ERROR_CHECK(err); err = nvs_commit(my_handle); ESP_ERROR_CHECK(err); nvs_close(my_handle); } uint32_t state_load(uint8_t *state_buffer, uint32_t n_buffer) { // ... // Load a previous library state from non-volatile memory, if available. // // Return zero if loading was unsuccessful or no state was available, // otherwise return length of loaded state string. // ... ESP_LOGI("BME680 - state_load", "Load state: buffer-size %d", n_buffer ); nvs_handle_t my_handle; esp_err_t err = nvs_open("state", NVS_READONLY, &my_handle); ESP_ERROR_CHECK(err); err = nvs_get_blob(my_handle, sensor_binary, state_buffer, &n_buffer); // We close this anyway even if the operation didn't succeed. nvs_close(my_handle); if (err == ESP_OK) { return n_buffer; } ESP_LOGW(TAG, "loading sensor binary blob failed with code %d", err); return 0; }    2- Timestamp. After setting the RTC to correct date-time initially, you have to get timestamp using get gettimeofday() then convert it to uS. I've written a small function to get timestamp in uS; you can pass this function as the timestamp calculator:   long long get_elapse_time_since_1970() { struct timeval current_time; gettimeofday(&current_time, NULL); printf("get_elapse_time_since_1970 - seconds : %ld - micro seconds : %ld",current_time.tv_sec, current_time.tv_usec); printf("current_time.tv_usec + (current_time.tv_sec * 1000000ll): %lld", current_time.tv_usec + (current_time.tv_sec * 1000000ll)); return current_time.tv_usec + (current_time.tv_sec * 1000000ll); }    3- Make sure timestamps across readings are 300s or 3s (print timestamp from the bsec output function to cross-check) 4-Save state after each reading; you can set this. bsec_iot_loop(bme680_sleep, esp_timer_get_time, output_ready, state_save, 1/* 10000 */);   I hope that this supports everyone else.. ... View more

Hi BSTRobin Thanks. However, for the first point its based on the comments provided by BOSCH it seems its per sample and not per frequency. So if we pass it as  '1' means that after each reading (regardless of the sleeping duration either 3s or 300s) it will save the state. Its very clear in the comments that came with the library   /* State is saved every 10.000 samples, which means every 10.000 * 3 secs = 500 minutes */   In my case, since the uC will be shutoff, then the save frequancy should be 1. RTC trigger will switch it on again with fresh start. Having said that, I've managed to get the correct timestamp between readings to be approx 332s (which is less that 50%+- recommendation in the library documentation), however, still the accuracy is still zero even after 12hr. ... View more

Thanks! 1- the profile we are using is 300s, so its one sample that is going to be saved each 300s (5min). Please let me know if I misunderstood it. 2- Timestamp is the delta between two wakeup? ... View more

Thanks for your fast response! 1-I am saving 1 state each 300s not 3s. 2-Timestamp is not clear for me here, real-time system time, what is the calculation for it? Assuming 1st data collection happened at 10:00:00AM next expected sample will be at 10:05:00 (for 300s freq.) How to calculate timestamp value? since it's expecting long long int data type, please excuse my ignorance here, but its not c? I really appreciate your support, ... View more