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Page Revision: 2012/09/06 16:13

Session Initiation

After a successful TCP (socket) connection, the T4 FIX API basic requirement is to have both the Initiator and Acceptor start with sequence number 1. The client will initiate the FIX Session by sending a Logon Message to the T4 FIX API server. Successful authentication will be responded with a Logon message echo. The Password field (Tag 96) of the API server logon message will be identified with an asterisk.

Drop of a physical connection will result in the end of a FIX Session. Upon reconnection, the client is required to start a new FIX Session with sequence number 1. The T4 API server will appropriately respond with messages starting with sequence number 1.

Authentication Requirements

After a successful physical connection to the T4 FIX API server, authenticated access is achieved with the following parameters in the client's Logon message:

Tag Name	Tag Number	Description
TargetCompId	56	FIX API System
SenderCompId	49	Firm Name
SecureData	91	Application ID (FIX API ID)
SecureDataLen	90	Length of Application ID string
SenderSubId	50	Firm User Name (Trader name, desk, etc.)
RawData	96	Firm User Password
RawDataLen	95	Length of Firm User Password string

Failure to provide the correct parameters in the Logon message will result in an logon failure. Appropriately, a Logout message will be sent to the client. The Logout message will contain a short description of the failure to help determine the cause of failed authentication. Thereafter, a physical disconnection will occur. As the FIX Session failed, the T4 FIX API will expect a new attempt for a new FIX session. The next Logon message (from the client) must start with sequence number 1.

Message Dictionary

Tag	Field Name	Req'd	Comments
	Standard Header	Y	MsgType = A
91	SecureData	Y	FIX API ID. Please contact your FIX API Administrator for your authorized id.
90	SecureDataLen	Y	Length of SecureData string
49	SenderCompID	Y	Assigned value used to identify firm sending message
56	TargetCompID	Y	Assigned value used to identify receiving firm
50	SenderSubID	Y	Assigned value used to identify specific message originator (trader, desk, etc.)
	Body	Y
98	EncryptMethod	Y	(Always unencrypted). Value = None
108	HeartBtInt	Y	Heartbeat interval. Set to 30 seconds.
95	RawDataLength	Y	Length of user Password string
96	RawData	Y	Password for user authentication
141	ResetSeqNumFlag	N	Not used. Indicates both sides of a FIX session should reset sequence numbers
383	MaxMessageSize	N	Not used. Can be used to specify the maximum number of bytes supported for messages received
384	NoMsgType Group	N	Not used. Specifies the number of repeating MsgTypes specified
	Standard Trailer	Y

Sample Message

34=1|49=test|56=T4Test|50=TraderName|52=20120904-17:37:16.848|91=64768859-3DCF-4214-A4E8-DA66881AFC63|90=36|95=10|96=_password_|98=None|108=30|

[FIXLOGIN]
[MsgSeqNum] 34 = 1
[SenderCompID] 49 = test
[TargetCompID] 56 = T4Test
[SenderSubID] 50 = TraderName
[SendingTime] 52 = 20120904-17:33:50.398
[SecureData] 91 = 64768859-3DCF-4214-A4E8-DA66881AFC63
[SecureDataLen] 90 = 36
[RawDataLength] 95 = 10
[RawData] 96 = _password_
[EncryptMethod] 98 = None
[HeartBtInt] 108 = 30

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