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Page Revision: 2012/08/31 18:15

Session Initiation

Upon an established TCP connection, the T4 FIX API basic requirement is to have the initiator and acceptor start sequence numbers from 1.

Drop of a physical (TCP socket) connection will result in the end of a FIX session. Upon reconnection, a new FIX session will be started with a sequence number of 1 (for the API User). Likewise, the T4 API server will respond with messages starting with a sequence number of 1.

Authentication Requirements

Message Dictionary Descriptions

ag !!Field Name !!Req'd !!Comments
||Standard Header ||Y ||MsgType = A
8 ||EncryptMethod ||Y ||(Always unencrypted)
5 ||RawDataLength ||N ||Required for some authentication methods
6 ||RawData ||N ||Required for some authentication methods
41 ||ResetSeqNumFlag ||N ||Indicates both sides of a FIX session should reset sequence numbers
89 ||NextExpectedMsgSeqNum ||N ||Optional, alternative via counterparty bi-lateral agreement message gap detection and recovery approach
83 ||MaxMessageSize ||N ||Can be used to specify the maximum number of bytes supported for messages received

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