# Heartbeats

Along with uplink messages (events) triggered irregularly (such as sensor-triggered events), you can also receive periodical events that are triggered by time only. We call some of these events **Heartbeats.**

## **Introduction**

Heartbeats are **mode-independent events triggered by time**. There are **3 heartbeats** defined in API 6, Heartbeat 1, Heartbeat 2, and Heartbeat 3. **Heartbeats 1 and 2** are identical yet individual and you can fine-tune their behavior and appended data with a lot of settings. **Heartbeat 3** is used for regular messages with MAC addresses and to control the Stupid modes and its settings are limited compared to HB 1 and 2.

###