> ## Documentation Index
> Fetch the complete documentation index at: https://docs.kraken.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Test Request

> FIX message used to force a Heartbeat from the counterparty.

The Test Request message is used to force a Heartbeat from the other side of the connection. When a Test Request is sent, the recipient must respond with a Heartbeat message containing the same TestReqID value.

<Tabs>
  <Tab title="FIX Specification">
    <ParamField path="header" type="" required>
      MsgType <code>1</code>
    </ParamField>

    <ParamField path="112 - TestReqID" type="string" required>
      Unique identifier for the test request.
    </ParamField>

    <ParamField path="trailer" type="" required />
  </Tab>
</Tabs>