Important Notice: Our web hosting provider recently started charging us for additional visits, which was unexpected. In response, we're seeking donations. Depending on the situation, we may explore different monetization options for our Community and Expert Contributors. It's crucial to provide more returns for their expertise and offer more Expert Validated Answers or AI Validated Answers. Learn more about our hosting issue here.

What is heartbeat mode and how is it different from polling?

April 26, 2017different heartbeat mode polling

0

Posted

What is heartbeat mode and how is it different from polling?

1 Answer

0

Posted

Polling is a message that originates from the Gateway to Nodes. When a Node receives a polling message, it is expected to immediately respond to the Gateway, indicating the link is operational. There are no retries on a polling message, just a single attempt of communication between the Gateway and Node. Heartbeat mode is driven by the Node. The Node sends a heartbeat message to the Gateway based on a specific time interval. The Node resends the message when the message is not acknowledged by the Gateway. The Gateway is programmed to expect a message from each Node within a certain interval (Node Heartbeat Interval + Time for Message Retries). If the Gateway determines that a Node has not checked in within a specified interval, the radio link is considered to be bad. The maximum time an error is detected will be between one and two heartbeat intervals. For more information, refer to the Monitoring DX80 System Health technical note.