[Docs] Organization able to monitor device status (online ,offline)

[truonghoangduy]

EPIC :

An organization able to monitor device status (online , offline)

Description :

As devices (mobile_app) are working organizations want to check the device connection status. So that they could identify in real-time does the device is still functional (online) or has been shut down (offline).

19 After doing research we are using MQTT for this feature.

• [x] Mobile able to connect to ours Backend MQTT broker with credentail (device-id, username, password)
• [x] Having security layer in MQTT subscriber detail in this link https://github.com/moscajs/aedes/issues/513 , and aedes server impl https://github.com/moscajs/aedes/blob/main/docs/Aedes.md#handler-authenticate-client-username-password-callback.
• [x] When the device has been created by #12 backend will create the device connection collection but the status going to be offfline as default.
• [x] Device connect/disconnect event occurs will be saved in (firestore collection)

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Ex meaning for suggestion, you could delare your own impl if you not cool with it fill free to notify me

Ex: Firestore collection

var device_connection = firestore.col("device-status").col("device-id").{}

Ex: Stored object

status: offline|online
timespan: int "Based on this we could know what time does the device has been in those statuses"

[DangCao1999]

the status will be 0|1 not offline|online