Handling Asynchronous Variable Updates

Some communication protocols allow devices to asynchronously inform the server about variable value updates. This often happens in two cases:

• If a communication protocol is optimized to avoid polling through low-speed, low-bandwidth or unreliable connections
• If a device runs real-time operating system (RTOS) and the communication protocol allows it to send values updates at fixed rate

If a driver is internally designed to receive asynchronous value updates, it should perform the following actions if such an update is received:

• Create a new DataTable representing variable value and fill it with data
• Call DeviceContext.asyncVariableUpdate(String variable, DataTable value)

Iotellect Server will process new value, save it to the history, and deliver to update listeners once asyncVariableUpdate() is called.

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