> For the complete documentation index, see [llms.txt](https://docs.txflash.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.txflash.io/connection-guide.md).

# Connection guide

## Endpoint

The relay opens a persistent TCP connection to the customer endpoint supplied during onboarding.

```
<consumer-private-ip>:<port>
```

The endpoint must accept more than one connection over its lifetime because the relay reconnects after network failures or listener restarts.

## Recommended socket behavior

* Enable `TCP_NODELAY`.
* Accept a connection and read frames in a loop.
* Do not assume one `read` equals one frame.
* Use bounded buffering and reject payloads larger than 4 MiB.
* Log protocol errors before closing the socket.
* Deduplicate items by `(sequence, ordinal)`.

## Minimal read loop

```
while connected:
    header = read_exact(20)
    length_and_flags = u32_le(header[0:4])
    require length_and_flags & 0x10000000 != 0

    payload_len = length_and_flags & 0x0fffffff
    require payload_len <= 4 MiB
    payload = read_exact(payload_len)

    decode_direct(payload)
```


---

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