Add support for multiple devices in bme680_bsec (#3550)

* Add initial support for multiple devices Re-introduce support for multiple I2C devices (it was suppressed in df37a7635f). Devices are identified by their I2C address, and the BME680 can only have the 0x76 or 0x77 address, so this adds support for a maximum of two devices. * Reintegrate commit ebf13a0b Reintegrate commit ebf13a0ba0 which was lost in my changes (I were working on old files) * wrong commit * wrong commit * Reintegrate commit ebf13a0b Reintegrate commit ebf13a0ba0 which was lost due to me working on old files * Reintroduce newlines at end of files * Reintroduce newlines at end of files * Adhere to codebase standards Obey the "All uses of class members and member functions should be prefixed with this-> to distinguish them from global functions in code review" rule of the Codebase Standards * Fix formatting according to clang-format * Perform the BSEC library reinitialization+snapshot only when more than one device is present * Fix formatting according to clang-format * Degrade abort message in restore_state_() from warning to verbose This always happen at initial setup, so it's not a really useful message; when some real problems arise, we'll have a more useful warning from snapshot_state_() Co-authored-by: Trevor North <trevor@freedisc.co.uk> * Reduce peak stack usage to avoid bootloops on ESP8266 Achieved mainly by moving the work_buffer needed by the BSEC library to the heap, as a single global work buffer shared by all instances. ::set_config_ has been reverted to a code path similar to the original, as that reduces peak stack usage enough to be OK on ESP8266 even without moving the work_buffer to the heap. * Fix formatting according to clang-format * Add support for devices with the same i2c address Devices are now identified using their index in the BME680BSECComponent::instances member, which became a vector. This allows adding two devices with the same i2c address (which should be placed on different i2c buses). Since a BME680 can only have an address of 0x76 or 0x77, a maximum of 2 devices could be added before this commit. Now there is no theoretical limit on the number of devices which could be added. * Fix formatting according to clang-format * Fix formatting according to clang-format --------- Co-authored-by: Trevor North <trevor@freedisc.co.uk> Co-authored-by: Jesse Hills <3060199+jesserockz@users.noreply.github.com>
2024-11-10 01:07:45 +01:00 · 2023-03-07 08:15:40 +01:00 · 2023-03-07 08:15:40 +01:00 · 356efdb92c
commit 356efdb92c
parent bb5ab8b36d
3 changed files with 215 additions and 88 deletions
--- a/esphome/components/bme680_bsec/init.py
+++ b/esphome/components/bme680_bsec/init.py
@ -6,6 +6,7 @@ from esphome.const import CONF_ID
 CODEOWNERS = ["@trvrnrth"]
 DEPENDENCIES = ["i2c"]
 AUTO_LOAD = ["sensor", "text_sensor"]
+MULTI_CONF = True

 CONF_BME680_BSEC_ID = "bme680_bsec_id"
 CONF_TEMPERATURE_OFFSET = "temperature_offset"
@ -54,6 +55,7 @@ async def to_code(config):
    await cg.register_component(var, config)
    await i2c.register_i2c_device(var, config)

+    cg.add(var.set_device_id(str(config[CONF_ID])))
    cg.add(var.set_temperature_offset(config[CONF_TEMPERATURE_OFFSET]))
    cg.add(var.set_iaq_mode(config[CONF_IAQ_MODE]))
    cg.add(var.set_sample_rate(config[CONF_SAMPLE_RATE]))
--- a/esphome/components/bme680_bsec/bme680_bsec.cpp
+++ b/esphome/components/bme680_bsec/bme680_bsec.cpp
@ -10,19 +10,24 @@ static const char *const TAG = "bme680_bsec.sensor";

 static const std::string IAQ_ACCURACY_STATES[4] = {"Stabilizing", "Uncertain", "Calibrating", "Calibrated"};

-BME680BSECComponent *BME680BSECComponent::instance;  // NOLINT(cppcoreguidelines-avoid-non-const-global-variables)
+std::vector<BME680BSECComponent *>
+    BME680BSECComponent::instances;  // NOLINT(cppcoreguidelines-avoid-non-const-global-variables)
+uint8_t BME680BSECComponent::work_buffer_[BSEC_MAX_WORKBUFFER_SIZE] = {0};

 void BME680BSECComponent::setup() {
-  ESP_LOGCONFIG(TAG, "Setting up BME680 via BSEC...");
-  BME680BSECComponent::instance = this;
+  ESP_LOGCONFIG(TAG, "Setting up BME680(%s) via BSEC...", this->device_id_.c_str());

-  this->bsec_status_ = bsec_init();
-  if (this->bsec_status_ != BSEC_OK) {
-    this->mark_failed();
-    return;
-  }
+  uint8_t new_idx = BME680BSECComponent::instances.size();
+  BME680BSECComponent::instances.push_back(this);

-  this->bme680_.dev_id = this->address_;
+  this->bsec_state_data_valid_ = false;
+
+  // Initialize the bme680_ structure (passed-in to the bme680_* functions) and the BME680 device
+  this->bme680_.dev_id =
+      new_idx;  // This is a "Place holder to store the id of the device structure" (see bme680_defs.h).
+                // This will be passed-in as first parameter to the next "read" and "write" function pointers.
+                // We currently use the index of the object in the BME680BSECComponent::instances vector to identify
+                // the different devices in the system.
  this->bme680_.intf = BME680_I2C_INTF;
  this->bme680_.read = BME680BSECComponent::read_bytes_wrapper;
  this->bme680_.write = BME680BSECComponent::write_bytes_wrapper;
@ -35,29 +40,30 @@ void BME680BSECComponent::setup() {
    return;
  }

-  if (this->sample_rate_ == SAMPLE_RATE_ULP) {
-    const uint8_t bsec_config[] = {
-#include "config/generic_33v_300s_28d/bsec_iaq.txt"
-    };
-    this->set_config_(bsec_config);
-  } else {
-    const uint8_t bsec_config[] = {
-#include "config/generic_33v_3s_28d/bsec_iaq.txt"
-    };
-    this->set_config_(bsec_config);
-  }
-  this->update_subscription_();
-  if (this->bsec_status_ != BSEC_OK) {
+  // Initialize the BSEC library
+  if (this->reinit_bsec_lib_() != 0) {
    this->mark_failed();
    return;
  }

+  // Load the BSEC library state from storage
  this->load_state_();
 }

-void BME680BSECComponent::set_config_(const uint8_t *config) {
-  uint8_t work_buffer[BSEC_MAX_WORKBUFFER_SIZE];
-  this->bsec_status_ = bsec_set_configuration(config, BSEC_MAX_PROPERTY_BLOB_SIZE, work_buffer, sizeof(work_buffer));
+void BME680BSECComponent::set_config_() {
+  if (this->sample_rate_ == SAMPLE_RATE_ULP) {
+    const uint8_t config[] = {
+#include "config/generic_33v_300s_28d/bsec_iaq.txt"
+    };
+    this->bsec_status_ =
+        bsec_set_configuration(config, BSEC_MAX_PROPERTY_BLOB_SIZE, this->work_buffer_, sizeof(this->work_buffer_));
+  } else {
+    const uint8_t config[] = {
+#include "config/generic_33v_3s_28d/bsec_iaq.txt"
+    };
+    this->bsec_status_ =
+        bsec_set_configuration(config, BSEC_MAX_PROPERTY_BLOB_SIZE, this->work_buffer_, sizeof(this->work_buffer_));
+  }
 }

 float BME680BSECComponent::calc_sensor_sample_rate_(SampleRate sample_rate) {
@ -118,10 +124,12 @@ void BME680BSECComponent::update_subscription_() {
  uint8_t num_sensor_settings = BSEC_MAX_PHYSICAL_SENSOR;
  this->bsec_status_ =
      bsec_update_subscription(virtual_sensors, num_virtual_sensors, sensor_settings, &num_sensor_settings);
+  ESP_LOGV(TAG, "%s: updating subscription for %d virtual sensors (out=%d sensors)", this->device_id_.c_str(),
+           num_virtual_sensors, num_sensor_settings);
 }

 void BME680BSECComponent::dump_config() {
-  ESP_LOGCONFIG(TAG, "BME680 via BSEC:");
+  ESP_LOGCONFIG(TAG, "%s via BSEC:", this->device_id_.c_str());

  bsec_version_t version;
  bsec_get_version(&version);
@ -185,23 +193,31 @@ void BME680BSECComponent::run_() {
    return;
  }

-  ESP_LOGV(TAG, "Performing sensor run");
+  ESP_LOGV(TAG, "%s: Performing sensor run", this->device_id_.c_str());

-  bsec_bme_settings_t bme680_settings;
-  this->bsec_status_ = bsec_sensor_control(curr_time_ns, &bme680_settings);
+  // Restore BSEC library state
+  // The reinit_bsec_lib_ method is computationally expensive: it takes 1200÷2900 microseconds on a ESP32.
+  // It can be skipped entirely when there is only one device (since the BSEC library won't be shared)
+  if (BME680BSECComponent::instances.size() > 1) {
+    int res = this->reinit_bsec_lib_();
+    if (res != 0)
+      return;
+  }
+
+  this->bsec_status_ = bsec_sensor_control(curr_time_ns, &this->bme680_settings_);
  if (this->bsec_status_ < BSEC_OK) {
    ESP_LOGW(TAG, "Failed to fetch sensor control settings (BSEC Error Code %d)", this->bsec_status_);
    return;
  }
-  this->next_call_ns_ = bme680_settings.next_call;
+  this->next_call_ns_ = this->bme680_settings_.next_call;

-  if (bme680_settings.trigger_measurement) {
-    this->bme680_.tph_sett.os_temp = bme680_settings.temperature_oversampling;
-    this->bme680_.tph_sett.os_pres = bme680_settings.pressure_oversampling;
-    this->bme680_.tph_sett.os_hum = bme680_settings.humidity_oversampling;
-    this->bme680_.gas_sett.run_gas = bme680_settings.run_gas;
-    this->bme680_.gas_sett.heatr_temp = bme680_settings.heater_temperature;
-    this->bme680_.gas_sett.heatr_dur = bme680_settings.heating_duration;
+  if (this->bme680_settings_.trigger_measurement) {
+    this->bme680_.tph_sett.os_temp = this->bme680_settings_.temperature_oversampling;
+    this->bme680_.tph_sett.os_pres = this->bme680_settings_.pressure_oversampling;
+    this->bme680_.tph_sett.os_hum = this->bme680_settings_.humidity_oversampling;
+    this->bme680_.gas_sett.run_gas = this->bme680_settings_.run_gas;
+    this->bme680_.gas_sett.heatr_temp = this->bme680_settings_.heater_temperature;
+    this->bme680_.gas_sett.heatr_dur = this->bme680_settings_.heating_duration;
    this->bme680_.power_mode = BME680_FORCED_MODE;
    uint16_t desired_settings = BME680_OST_SEL | BME680_OSP_SEL | BME680_OSH_SEL | BME680_GAS_SENSOR_SEL;
    this->bme680_status_ = bme680_set_sensor_settings(desired_settings, &this->bme680_);
@ -218,19 +234,26 @@ void BME680BSECComponent::run_() {

    uint16_t meas_dur = 0;
    bme680_get_profile_dur(&meas_dur, &this->bme680_);
+
+    // Since we are about to go "out of scope" in the loop, take a snapshot of the state now so we can restore it later
+    // TODO: it would be interesting to see if this is really needed here, or if it's needed only after each
+    // bsec_do_steps() call
+    if (BME680BSECComponent::instances.size() > 1)
+      this->snapshot_state_();
+
    ESP_LOGV(TAG, "Queueing read in %ums", meas_dur);
-    this->set_timeout("read", meas_dur,
-                      [this, curr_time_ns, bme680_settings]() { this->read_(curr_time_ns, bme680_settings); });
+    this->set_timeout("read", meas_dur, [this]() { this->read_(); });
  } else {
    ESP_LOGV(TAG, "Measurement not required");
-    this->read_(curr_time_ns, bme680_settings);
+    this->read_();
  }
 }

-void BME680BSECComponent::read_(int64_t trigger_time_ns, bsec_bme_settings_t bme680_settings) {
-  ESP_LOGV(TAG, "Reading data");
+void BME680BSECComponent::read_() {
+  ESP_LOGV(TAG, "%s: Reading data", this->device_id_.c_str());
+  int64_t curr_time_ns = this->get_time_ns_();

-  if (bme680_settings.trigger_measurement) {
+  if (this->bme680_settings_.trigger_measurement) {
    while (this->bme680_.power_mode != BME680_SLEEP_MODE) {
      this->bme680_status_ = bme680_get_sensor_mode(&this->bme680_);
      if (this->bme680_status_ != BME680_OK) {
@ -239,7 +262,7 @@ void BME680BSECComponent::read_(int64_t trigger_time_ns, bsec_bme_settings_t bme
    }
  }

-  if (!bme680_settings.process_data) {
+  if (!this->bme680_settings_.process_data) {
    ESP_LOGV(TAG, "Data processing not required");
    return;
  }
@ -259,35 +282,35 @@ void BME680BSECComponent::read_(int64_t trigger_time_ns, bsec_bme_settings_t bme
  bsec_input_t inputs[BSEC_MAX_PHYSICAL_SENSOR];  // Temperature, Pressure, Humidity & Gas Resistance
  uint8_t num_inputs = 0;

-  if (bme680_settings.process_data & BSEC_PROCESS_TEMPERATURE) {
+  if (this->bme680_settings_.process_data & BSEC_PROCESS_TEMPERATURE) {
    inputs[num_inputs].sensor_id = BSEC_INPUT_TEMPERATURE;
    inputs[num_inputs].signal = data.temperature / 100.0f;
-    inputs[num_inputs].time_stamp = trigger_time_ns;
+    inputs[num_inputs].time_stamp = curr_time_ns;
    num_inputs++;

    // Temperature offset from the real temperature due to external heat sources
    inputs[num_inputs].sensor_id = BSEC_INPUT_HEATSOURCE;
    inputs[num_inputs].signal = this->temperature_offset_;
-    inputs[num_inputs].time_stamp = trigger_time_ns;
+    inputs[num_inputs].time_stamp = curr_time_ns;
    num_inputs++;
  }
-  if (bme680_settings.process_data & BSEC_PROCESS_HUMIDITY) {
+  if (this->bme680_settings_.process_data & BSEC_PROCESS_HUMIDITY) {
    inputs[num_inputs].sensor_id = BSEC_INPUT_HUMIDITY;
    inputs[num_inputs].signal = data.humidity / 1000.0f;
-    inputs[num_inputs].time_stamp = trigger_time_ns;
+    inputs[num_inputs].time_stamp = curr_time_ns;
    num_inputs++;
  }
-  if (bme680_settings.process_data & BSEC_PROCESS_PRESSURE) {
+  if (this->bme680_settings_.process_data & BSEC_PROCESS_PRESSURE) {
    inputs[num_inputs].sensor_id = BSEC_INPUT_PRESSURE;
    inputs[num_inputs].signal = data.pressure;
-    inputs[num_inputs].time_stamp = trigger_time_ns;
+    inputs[num_inputs].time_stamp = curr_time_ns;
    num_inputs++;
  }
-  if (bme680_settings.process_data & BSEC_PROCESS_GAS) {
+  if (this->bme680_settings_.process_data & BSEC_PROCESS_GAS) {
    if (data.status & BME680_GASM_VALID_MSK) {
      inputs[num_inputs].sensor_id = BSEC_INPUT_GASRESISTOR;
      inputs[num_inputs].signal = data.gas_resistance;
-      inputs[num_inputs].time_stamp = trigger_time_ns;
+      inputs[num_inputs].time_stamp = curr_time_ns;
      num_inputs++;
    } else {
      ESP_LOGD(TAG, "BME680 did not report gas data");
@ -298,6 +321,22 @@ void BME680BSECComponent::read_(int64_t trigger_time_ns, bsec_bme_settings_t bme
    return;
  }

+  // Restore BSEC library state
+  // The reinit_bsec_lib_ method is computationally expensive: it takes 1200÷2900 microseconds on a ESP32.
+  // It can be skipped entirely when there is only one device (since the BSEC library won't be shared)
+  if (BME680BSECComponent::instances.size() > 1) {
+    int res = this->reinit_bsec_lib_();
+    if (res != 0)
+      return;
+    // Now that the BSEC library has been re-initialized, bsec_sensor_control *NEEDS* to be called in order to support
+    // multiple devices with a different set of enabled sensors (even if the bme680_settings_ data is not used)
+    this->bsec_status_ = bsec_sensor_control(curr_time_ns, &this->bme680_settings_);
+    if (this->bsec_status_ < BSEC_OK) {
+      ESP_LOGW(TAG, "Failed to fetch sensor control settings (BSEC Error Code %d)", this->bsec_status_);
+      return;
+    }
+  }
+
  bsec_output_t outputs[BSEC_NUMBER_OUTPUTS];
  uint8_t num_outputs = BSEC_NUMBER_OUTPUTS;
  this->bsec_status_ = bsec_do_steps(inputs, num_inputs, outputs, &num_outputs);
@ -305,6 +344,13 @@ void BME680BSECComponent::read_(int64_t trigger_time_ns, bsec_bme_settings_t bme
    ESP_LOGW(TAG, "BSEC failed to process signals (BSEC Error Code %d)", this->bsec_status_);
    return;
  }
+  ESP_LOGV(TAG, "%s: after bsec_do_steps: num_inputs=%d num_outputs=%d", this->device_id_.c_str(), num_inputs,
+           num_outputs);
+
+  // Since we are about to go "out of scope" in the loop, take a snapshot of the state now so we can restore it later
+  if (BME680BSECComponent::instances.size() > 1)
+    this->snapshot_state_();
+
  if (num_outputs < 1) {
    ESP_LOGD(TAG, "No signal outputs provided by BSEC");
    return;
@ -314,7 +360,7 @@ void BME680BSECComponent::read_(int64_t trigger_time_ns, bsec_bme_settings_t bme
 }

 void BME680BSECComponent::publish_(const bsec_output_t *outputs, uint8_t num_outputs) {
-  ESP_LOGV(TAG, "Queuing sensor state publish actions");
+  ESP_LOGV(TAG, "%s: Queuing sensor state publish actions", this->device_id_.c_str());
  for (uint8_t i = 0; i < num_outputs; i++) {
    float signal = outputs[i].signal;
    switch (outputs[i].sensor_id) {
@ -376,12 +422,20 @@ void BME680BSECComponent::publish_sensor_(text_sensor::TextSensor *sensor, const
  sensor->publish_state(value);
 }

-int8_t BME680BSECComponent::read_bytes_wrapper(uint8_t address, uint8_t a_register, uint8_t *data, uint16_t len) {
-  return BME680BSECComponent::instance->read_bytes(a_register, data, len) ? 0 : -1;
+// Communication function - read
+// First parameter is the "dev_id" member of our "bme680_" object, which is passed-back here as-is
+int8_t BME680BSECComponent::read_bytes_wrapper(uint8_t devid, uint8_t a_register, uint8_t *data, uint16_t len) {
+  BME680BSECComponent *inst = instances[devid];
+  // Use the I2CDevice::read_bytes method to perform the actual I2C register read
+  return inst->read_bytes(a_register, data, len) ? 0 : -1;
 }

-int8_t BME680BSECComponent::write_bytes_wrapper(uint8_t address, uint8_t a_register, uint8_t *data, uint16_t len) {
-  return BME680BSECComponent::instance->write_bytes(a_register, data, len) ? 0 : -1;
+// Communication function - write
+// First parameter is the "dev_id" member of our "bme680_" object, which is passed-back here as-is
+int8_t BME680BSECComponent::write_bytes_wrapper(uint8_t devid, uint8_t a_register, uint8_t *data, uint16_t len) {
+  BME680BSECComponent *inst = instances[devid];
+  // Use the I2CDevice::write_bytes method to perform the actual I2C register write
+  return inst->write_bytes(a_register, data, len) ? 0 : -1;
 }

 void BME680BSECComponent::delay_ms(uint32_t period) {
@ -389,41 +443,97 @@ void BME680BSECComponent::delay_ms(uint32_t period) {
  delay(period);
 }

+// Fetch the BSEC library state and save it in the bsec_state_data_ member (volatile memory)
+// Used to share the library when using more than one sensor
+void BME680BSECComponent::snapshot_state_() {
+  uint32_t num_serialized_state = BSEC_MAX_STATE_BLOB_SIZE;
+  this->bsec_status_ = bsec_get_state(0, this->bsec_state_data_, BSEC_MAX_STATE_BLOB_SIZE, this->work_buffer_,
+                                      sizeof(this->work_buffer_), &num_serialized_state);
+  if (this->bsec_status_ != BSEC_OK) {
+    ESP_LOGW(TAG, "%s: Failed to fetch BSEC library state for snapshot (BSEC Error Code %d)", this->device_id_.c_str(),
+             this->bsec_status_);
+    return;
+  }
+  this->bsec_state_data_valid_ = true;
+}
+
+// Restores the BSEC library state from a snapshot in memory
+// Used to share the library when using more than one sensor
+void BME680BSECComponent::restore_state_() {
+  if (!this->bsec_state_data_valid_) {
+    ESP_LOGV(TAG, "%s: BSEC state data NOT valid, aborting restore_state_()", this->device_id_.c_str());
+    return;
+  }
+
+  this->bsec_status_ =
+      bsec_set_state(this->bsec_state_data_, BSEC_MAX_STATE_BLOB_SIZE, this->work_buffer_, sizeof(this->work_buffer_));
+  if (this->bsec_status_ != BSEC_OK) {
+    ESP_LOGW(TAG, "Failed to restore BSEC library state (BSEC Error Code %d)", this->bsec_status_);
+    return;
+  }
+}
+
+int BME680BSECComponent::reinit_bsec_lib_() {
+  this->bsec_status_ = bsec_init();
+  if (this->bsec_status_ != BSEC_OK) {
+    this->mark_failed();
+    return -1;
+  }
+
+  this->set_config_();
+  if (this->bsec_status_ != BSEC_OK) {
+    this->mark_failed();
+    return -2;
+  }
+
+  this->restore_state_();
+
+  this->update_subscription_();
+  if (this->bsec_status_ != BSEC_OK) {
+    this->mark_failed();
+    return -3;
+  }
+
+  return 0;
+}
+
 void BME680BSECComponent::load_state_() {
-  uint32_t hash = fnv1_hash("bme680_bsec_state_" + to_string(this->address_));
+  uint32_t hash = fnv1_hash("bme680_bsec_state_" + this->device_id_);
  this->bsec_state_ = global_preferences->make_preference<uint8_t[BSEC_MAX_STATE_BLOB_SIZE]>(hash, true);

-  uint8_t state[BSEC_MAX_STATE_BLOB_SIZE];
-  if (this->bsec_state_.load(&state)) {
-    ESP_LOGV(TAG, "Loading state");
-    uint8_t work_buffer[BSEC_MAX_WORKBUFFER_SIZE];
-    this->bsec_status_ = bsec_set_state(state, BSEC_MAX_STATE_BLOB_SIZE, work_buffer, sizeof(work_buffer));
-    if (this->bsec_status_ != BSEC_OK) {
-      ESP_LOGW(TAG, "Failed to load state (BSEC Error Code %d)", this->bsec_status_);
-    }
-    ESP_LOGI(TAG, "Loaded state");
+  if (!this->bsec_state_.load(&this->bsec_state_data_)) {
+    // No saved BSEC library state available
+    return;
  }
+
+  ESP_LOGV(TAG, "%s: Loading BSEC library state", this->device_id_.c_str());
+  this->bsec_status_ =
+      bsec_set_state(this->bsec_state_data_, BSEC_MAX_STATE_BLOB_SIZE, this->work_buffer_, sizeof(this->work_buffer_));
+  if (this->bsec_status_ != BSEC_OK) {
+    ESP_LOGW(TAG, "%s: Failed to load BSEC library state (BSEC Error Code %d)", this->device_id_.c_str(),
+             this->bsec_status_);
+    return;
+  }
+  // All OK: set the BSEC state data as valid
+  this->bsec_state_data_valid_ = true;
+  ESP_LOGI(TAG, "%s: Loaded BSEC library state", this->device_id_.c_str());
 }

 void BME680BSECComponent::save_state_(uint8_t accuracy) {
  if (accuracy < 3 || (millis() - this->last_state_save_ms_ < this->state_save_interval_ms_)) {
    return;
  }
-
-  ESP_LOGV(TAG, "Saving state");
-
-  uint8_t state[BSEC_MAX_STATE_BLOB_SIZE];
-  uint8_t work_buffer[BSEC_MAX_STATE_BLOB_SIZE];
-  uint32_t num_serialized_state = BSEC_MAX_STATE_BLOB_SIZE;
-
-  this->bsec_status_ =
-      bsec_get_state(0, state, BSEC_MAX_STATE_BLOB_SIZE, work_buffer, BSEC_MAX_STATE_BLOB_SIZE, &num_serialized_state);
-  if (this->bsec_status_ != BSEC_OK) {
-    ESP_LOGW(TAG, "Failed fetch state for save (BSEC Error Code %d)", this->bsec_status_);
-    return;
+  if (BME680BSECComponent::instances.size() <= 1) {
+    // When a single device is in use, no snapshot is taken regularly so one is taken now
+    // On multiple devices, a snapshot is taken at every loop, so there is no need to take one here
+    this->snapshot_state_();
  }
+  if (!this->bsec_state_data_valid_)
+    return;

-  if (!this->bsec_state_.save(&state)) {
+  ESP_LOGV(TAG, "%s: Saving state", this->device_id_.c_str());
+
+  if (!this->bsec_state_.save(&this->bsec_state_data_)) {
    ESP_LOGW(TAG, "Failed to save state");
    return;
  }
--- a/esphome/components/bme680_bsec/bme680_bsec.h
+++ b/esphome/components/bme680_bsec/bme680_bsec.h
@ -31,6 +31,7 @@ enum SampleRate {

 class BME680BSECComponent : public Component, public i2c::I2CDevice {
 public:
+  void set_device_id(const std::string &devid) { this->device_id_.assign(devid); }
  void set_temperature_offset(float offset) { this->temperature_offset_ = offset; }
  void set_iaq_mode(IAQMode iaq_mode) { this->iaq_mode_ = iaq_mode; }
  void set_state_save_interval(uint32_t interval) { this->state_save_interval_ms_ = interval; }
@ -50,9 +51,9 @@ class BME680BSECComponent : public Component, public i2c::I2CDevice {
  void set_co2_equivalent_sensor(sensor::Sensor *sensor) { this->co2_equivalent_sensor_ = sensor; }
  void set_breath_voc_equivalent_sensor(sensor::Sensor *sensor) { this->breath_voc_equivalent_sensor_ = sensor; }

-  static BME680BSECComponent *instance;
-  static int8_t read_bytes_wrapper(uint8_t address, uint8_t a_register, uint8_t *data, uint16_t len);
-  static int8_t write_bytes_wrapper(uint8_t address, uint8_t a_register, uint8_t *data, uint16_t len);
+  static std::vector<BME680BSECComponent *> instances;
+  static int8_t read_bytes_wrapper(uint8_t devid, uint8_t a_register, uint8_t *data, uint16_t len);
+  static int8_t write_bytes_wrapper(uint8_t devid, uint8_t a_register, uint8_t *data, uint16_t len);
  static void delay_ms(uint32_t period);

  void setup() override;
@ -61,23 +62,33 @@ class BME680BSECComponent : public Component, public i2c::I2CDevice {
  void loop() override;

 protected:
-  void set_config_(const uint8_t *config);
+  void set_config_();
  float calc_sensor_sample_rate_(SampleRate sample_rate);
  void update_subscription_();

  void run_();
-  void read_(int64_t trigger_time_ns, bsec_bme_settings_t bme680_settings);
+  void read_();
  void publish_(const bsec_output_t *outputs, uint8_t num_outputs);
  int64_t get_time_ns_();

  void publish_sensor_(sensor::Sensor *sensor, float value, bool change_only = false);
  void publish_sensor_(text_sensor::TextSensor *sensor, const std::string &value);

-  void load_state_();
-  void save_state_(uint8_t accuracy);
+  void snapshot_state_();  // Fetch the current BSEC library state and save it in the bsec_state_data_ member (volatile
+                           // memory)
+  void restore_state_();   // Push the state contained in the bsec_state_data_ member (volatile memory) to the BSEC
+                           // library
+  int reinit_bsec_lib_();  // Prepare the BSEC library to be used again after this object returns active
+                           // (as the library may have been used by other objects)
+  void load_state_();      // Initialize the ESP preferences object; retrieve the BSEC library state from the ESP
+                           // preferences (storage); then save it in the bsec_state_data_ member (volatile memory) and
+                           // push it to the BSEC library
+  void save_state_(
+      uint8_t accuracy);  // Save the bsec_state_data_ member (volatile memory) to the ESP preferences (storage)

  void queue_push_(std::function<void()> &&f) { this->queue_.push(std::move(f)); }

+  static uint8_t work_buffer_[BSEC_MAX_WORKBUFFER_SIZE];
  struct bme680_dev bme680_;
  bsec_library_return_t bsec_status_{BSEC_OK};
  int8_t bme680_status_{BME680_OK};
@ -88,10 +99,14 @@ class BME680BSECComponent : public Component, public i2c::I2CDevice {

  std::queue<std::function<void()>> queue_;

+  bool bsec_state_data_valid_;
+  uint8_t bsec_state_data_[BSEC_MAX_STATE_BLOB_SIZE];  // This is the current snapshot of the BSEC library state
  ESPPreferenceObject bsec_state_;
  uint32_t state_save_interval_ms_{21600000};  // 6 hours - 4 times a day
  uint32_t last_state_save_ms_ = 0;
+  bsec_bme_settings_t bme680_settings_;

+  std::string device_id_;
  float temperature_offset_{0};
  IAQMode iaq_mode_{IAQ_MODE_STATIC};