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Periodically sent from the controller to the GUI.

• required uint64 uptime_ms = 1

  milliseconds since controller started up.

• required VentParams active_params = 2

  Current params being used by the the controller. This is used to ACK params sent by the GUI.

• required SensorsProto sensor_readings = 3

  Current sensor readings.

• required float pressure_setpoint_cm_h2o = 5

  Patient pressure we're trying to achieve.

• required float fan_power = 6

  Value in range [0, 1] indicating how fast we're spinning the fan.

Periodically sent from the GUI to the controller.

• required uint64 uptime_ms = 1

  milliseconds since GUI started up.

• required VentParams desired_params = 2

  Params set by GUI; this is a request to the controller to use these params.

Sensor readings. To be consistent with the other names in this file, this message should be called SensorReadings. But we have a C++ class called that, and without naming this one "Proto", it's going to be really hard to remember which is which.

Used in: ControllerStatus

• required float patient_pressure_cm_h2o = 1

• required float volume_ml = 2

• required float flow_ml_per_min = 3

• required float inflow_pressure_diff_cm_h2o = 4

• required float outflow_pressure_diff_cm_h2o = 5

• required uint64 breath_id = 6

  Identifies the current breath among all breaths handled since controller startup. Increases when a new breath begins; can be used on the receiver side for detecting breath boundaries from subsampled or lossy data. Receiver MUST NOT assume that this identifier is increasing, or dense. It might decrease e.g. in case of controller restart, and might be sparse.

• required float flow_correction_ml_per_min = 7

  Offset that the controller added to measured flow when computing flow_ml_per_min, in an attempt to make the volume graph look "right". If this is a large negative number, it may indicate a leak in the system.

• required float fio2 = 8

See https://docs.google.com/presentation/d/1DA1BQlCj8wNv60pGGzrldPfZBmr6WAH4WbrD4W7i43U for explanation of vent modes.

Used in: VentParams

• OFF = 0

• PRESSURE_CONTROL = 1

  Every breath is triggered by the machine, at a fixed rate. Operational parameters: PEEP - peep_cm_h2o RR - breaths_per_min PIP - pip_cm_h2o I:E - inspiratory_expiratory_ratio

• PRESSURE_ASSIST = 2

  Patients can trigger a breath for themselves so long as they exceed the/ minimum respiration rate. Ventilator triggers exhalation at a fixed point after inhalation. Operational parameters: PEEP - peep_cm_h2o min RR - breaths_per_min (note, interpreted as a minimum here) PIP - pip_cm_h2o I:E - inspiratory_expiratory_ratio P-trigger - inspiratory_trigger_cm_h2o

• HIGH_FLOW_NASAL_CANNULA = 3

  TODO: Implement me!

Values set by the ventilator operator.

Used in: ControllerStatus, GuiStatus

• required VentMode mode = 1

• required uint32 peep_cm_h2o = 3

  PEEP - positive end-expiratory pressure

• required uint32 breaths_per_min = 4

  RR - respiratory rate

• required uint32 pip_cm_h2o = 5

  PIP - peak inspiratory pressure

• required float inspiratory_expiratory_ratio = 6

  I:E

• required uint32 inspiratory_trigger_cm_h2o = 8

  P-trigger

• required uint32 expiratory_trigger_ml_per_min = 9

  TODO(jlebar): Is ml/min the correct unit for this?

  V-trigger

• required float fio2 = 10

  A value between 0..1. Technically only values in [0.21, 1] are allowed.