Model
'''''

Object Model
    The structured and human-readable description of the information being exchanged between the information provider and consumer.
		*The information about this soap dispenser is described in the object model of dispenser devices*
Property
    The semantic description of a piece of information.
        *The device_type property for the soap dispenser is 'dispenser'*
Value type
    The JSON data representation of the information contained in the property. Note that the value of a property can also be an object.
        *The value type of the device_type property is a string*
Object
    A logical grouping of properties
        *the geolocation object contains the longitude and latitude properties*
Item
    A digital set of information linked together and identified by an ID. In this context, an item can be a device, a space, a tag, or a message
        *We know this is a device item because it is represented by a device ID*

Device
''''''

Model
    The manufacturer 's commercial name of a device   
        *Clean Inc. introduced a new model in its scrubber family: the S200*
Serial Number
    A series of characters assigned by a manufacturer that uniquely identify a device specifically for this manufacturer  
        *The serial number of this S200 machine is S200-112* 
Production Date
    The date the device ID has been assigned by the manufacturer  
        *The device was produced and entered in the manufacturer 's database as a production date of June 3rd, 2019*
Registration Date
    The date the device is assigned to and can be accessed by a resource owner  
        *The customer bought the device on September 10th, 2019 which is also the registration date for accessing this device's data*
Last Contact 
    The date and time the device has last established a communication with the system  
        *The last contact with the device was as planned at 23:30 yesterday*
Start Connectivity Date
    The date a device has sent the first communication
        *The start connectivity date was 2 months after the registration date*
Statistic Date Range  
    The date-time range specified by the user between which the user is requesting statistic information about devices 
        *The supervisor would like to know how the device was used during the statistic date range between 7:00 and 17:00 last Monday*
Aggregation Start Date
    The starting date-time specified by the user in the statistic date range  
        *When requesting monthly information for January, please specify January 1st, 00:00 as an aggregation start date*...
Aggregation End Date  
    The end date-time specified by the user in the query date range  
        *...And January 31st, 23:59 as an aggregation end date*
Expected Next Service 
    The date-time of the next expected prognostic or predictive analysis 
        *The battery on this dispenser should be replaced during the expected next service on June 1st*
Error Code 
    A series of characters that uniquely identifies the reason a machine is defective
    
    - *The overheat error code means that the drive motor needs to be replaced*
    - *the communication_error means that the dispenser has not been communicating for a week*

Device Threshold
    A threshold that will trigger a communication event
        *The dispenser sent a notification when the device threshold for the filling level reached 20%*
Battery Health
    The health condition of a battery 
        *The battery health indicates that it is reaching its end of life*
Battery Level 
    The percentage of remaining battery capacity

    - *At the end of the shift, the battery level was 25%*
    - *The fixed equipment device battery level is 80%* 

Battery Level Timestamp 
    The date-time the battery level was last reported by the machine 
        *The battery level reported was recorded by the machine with a battery level timestamp of 15:30*
Battery Remaining Life
    The expected or predicted remaining life of the battery in percent before it must be replaced
        *The battery remaining life is now less than 10% and should be replaced*
Signal Strength
    The quality of the wireless signal at the device level
        *The signal strength of this device is barely enough to establish communication*
Signal Level
    The quality of the wireless signal at the device level measured in number of bars from 0 to 4

    - 0 means no signal
    - 4 means excellent signal

    *The signal level reported is 3 bars meaning that there is a good connectivity*
Wireless Technology
    The type of wireless signal used to provide data by the device. It can be: 

    - WiFi
    - 2G
    - 3G
    - 4G
    - 5G
    - LTE
    - LTE_m
    - Bluetooth 4.1
    - Bluetooth 4.2
    - Bluetooth 5
    - BLE
    - LORA
    - Wirepas
    - ENOCEAN
    - RFID
    - NB IOT
  
    *This device has a 4G modem for communication*
Signal Strength Threshold
    The minimum signal strength considered necessary to guarantee the quality of the data transmission
        *The signal strength threshold should be at -100dBm to ensure connectivity*

Space
'''''

Space Name
    A human readable description of a space that localizes the space in its physical environment
        *The Men's bathroom on the second floor of the office building is the name of the space representing a specific toilet*
Part of
    The parent space that contains the space being described
        *The bathroom is part of the the second floor space, which itself is part of the office building space*
Composed of
    The one or multiple spaces that are contained within the space being described
        *The second floor space is composed of an entrance space, 5 office spaces, and one bathroom space*

Message & Event
'''''''''''''''

Message
    A piece of information about an entity (device or space) that is communicated to the information consumer and initiated by the information provider
        *The bin manufacturer provided a message about the new filling level of the trash can in the entrance of the building*
Event
    A trigger that changes the state of an entity
        *The dead battery is the event that triggered the dispenser to stop working*
Alert
    An actionable event that requires external intervention (usually human intervention) to change the state of the entity
        *The alert informed the janitor to refill the empty soap dispenser*
Notification
    An event that does not require immediate external intervention and that informs about the new state of the entity
        *The cleaning supervisor is waiting for a notification that the cleaning machine is operational again following a service intervention*
Status message
    A message about the current state of an Entity
        *The latest status message about the soap dispenser indicated that it is 75% full*
Diagnostic message
    A message about a predicted future state of an entity
        *The diagnostic message indicated that the trash can will be full in two days*
Message category
    The characterization of a message being provided. It can be one of
     - "alert"
     - "notification"
     - "status"
     - "diagnostic"
  
    *The category of this event is an alert*
Message code
    A language independent and semantically descriptive short string summarizing the meaning of the message or event.
        *out_of_order is a message code indicating that the device is not operational*
Message timestamp
    The date and time the trigger for the message happened
        *The machine became unavailable on June 1st, 2021 at 22:34:10 which triggered an out_of_order alert*