Test Request
| Tag | Field Name | Required | Description |
|---|---|---|---|
| 35 | MsgType | Y | 1 |
| 112 | TestReqID | Y | Auto-generated request ID. |
If a HearbeatInterval + one seconds have elapsed since the last message received, a Test Request should be issued. If another HearbeatInterval + one seconds go by without receiving a message the TCP connection should be dropped. This ensures that a broken TCP connection will be detected even if the TCP stack doesn't notice (this has been observed to happen in WAN environments, particularly when a VPN is involved).