Archiving | HL7 MLLP Connector for Azure Logic Apps

Targets

Optional and off by default. Like BizTalk's message tracking, but as plain files and rows: the raw message before a run starts (or before it is sent), plus the ACK that went with it. Outputs include archiveId, which links a run to its archived copy.

Target	Setting	Layout
File	`File:Path`	Dated folders per source; file names sort in FIFO order, with a .json of metadata per message
NAS	Nas:Path (UNC), optional credentials on Windows	Same as File
SQL	Sql:ConnectionString, Sql:Table	One row per message or ACK with the MSH fields, MSA-1, endpoints, the decoded text and the raw bytes; the table is created automatically

Configure it in a Logic App

App settings, shared by every trigger and send action on the host (the gateway reads its Archive section):

LamboHl7Mllp__Archive__Targets                 = File,Sql
LamboHl7Mllp__Archive__File__Path              = /mnt/hl7-archive
LamboHl7Mllp__Archive__Sql__ConnectionString   = @Microsoft.KeyVault(SecretUri=https://<vault>.vault.azure.net/secrets/hl7-archive-sql)
LamboHl7Mllp__Archive__Queue__ConnectionString = @Microsoft.KeyVault(SecretUri=https://<vault>.vault.azure.net/secrets/hl7-archive-queue)
LamboHl7Mllp__Archive__OnFailure               = Reject

Spool queue: with Queue:ConnectionString set, a record a target can't take waits in an Azure Storage queue and is written later; the message is still acknowledged.
Nothing is ACKed without a copy: if neither the target nor the queue takes a record, OnFailure=Reject (the default) answers AE/CE and the sender resends; Send message fails with 503 and sends nothing.
Order: read the archive with ORDER BY EventTime, SequenceNumber (SQL) or by file name.
From App Service, outbound SMB (port 445) is blocked: use the SQL target, Azure Files mounted as a path, or a host with the share mounted.