Hearbeat (0)

Sent by either side if a message has not been received in the past 30 seconds. Should also be sent in response to a TestRequest (1).

TagNameValueDescription
35MsgType0Hearbeat message type
112TestReqID123If this heartbeat is in response to a TestRequest, copied from the TestRequest.

Example:

Sent:
8=FIX.4.2|9=112|35=0|49=****|56=FTX|34=4|112=20221017-20:31:39.748|52=20221017-20:31:39.537|10=128|

Received:
8=FIX.4.2|9=86|35=0|49=FTX|56=****|34=8|52=20221017-20:32:14.112|10=072|