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README.md

NATS FIX Acceptor Example

A simple example demonstrating how to use the natsfix acceptor to receive FIX messages over NATS.

Prerequisites

  • Go 1.25.0+
  • NATS server running (default: localhost:4222)

Running

Start a NATS server:

nats-server

Run the acceptor:

go run main.go

With custom settings:

go run main.go --nats nats://localhost:4222 --sender GATEWAY --target CLIENT1 --log-level debug

With NATS credentials:

go run main.go --nats nats://localhost:4222 --creds /path/to/creds.file

Configuration

The acceptor listens on the following NATS subjects (with defaults):

  • Inbound (receives from client): fix.FIXT_1_1.CLIENT1.GATEWAY
  • Outbound (sends to client): fix.FIXT_1_1.GATEWAY.CLIENT1

Testing

Send a test message using NATS CLI:

./fixfmt.sh "8=FIXT.1.1|9=65|35=A|49=CLIENT1|56=GATEWAY|34=1|52=20250116-12:00:00|98=0|108=30|10=000|1137=9|" | nats pub "fix.FIXT_1_1.CLIENT1.GATEWAY"