Overview
Live status of devtcp.derekethandavis.com — every TCP session, email, print job and label persisted across the Cloudflare suite.
Bindings
Craft on the wire
13 protocols, by hand, over cloudflare:sockets connect(). Fill the fields or flip to Raw edit and type the bytes yourself — then DIAL opens a real socket at the edge and persists the session. There is no magic.
Protocol
Send
Codegen target — DIAL always runs at the edge (cf)
# the exact bytes that will be written to the socket Raw mode: these exact bytes are sent. Newlines are sent as CRLF. Still passes the firewall.
Bytes on the wire — cf socket
; press DIAL — the Worker dials, not your browser. Egress firewall (ACL + DLP)
No dial yet. The firewall inspects the exact bytes before they leave.
Persisted
outbox
inbox
.read
Responses persist to R2 + D1 and park on the BusDO.
# pick a protocol + transport Print & labels
Craft a Zebra ZPL shipping label or a raw print job. It's classified, stored to R2 + D1, and ZPL is rendered to a PNG via Labelary — no physical printer needed (or DIAL one on :9100 from the bench).
ZPL shipping label
Raw print job (PCL/text)
Result
; craft a label or job — it persists to D1 + R2, ZPL renders to PNG. Records
The indexed rows in D1. Click a row to see its R2 blob; delete removes the row and its blobs.
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Blobs (R2)
Raw bytes in devtcp-blobs — transcripts, .eml, print payloads, ZPL + renders. Click to view, trash to delete.
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Firewall
The egress policy enforced on every dial — default-deny ACL zones + DLP rules.
DLP rules
Bus
The BusDO inspector inbox — responses parked from dials + ingests.
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Send mail
Real delivery via the Cloudflare Email Sending binding, persisted to emails + R2. (Workers can't open raw :465 — the hand-crafted SMTP-over-TLS dance runs in the CLI/container: devtcp mail.)
; the edge dials smtp.mx.cloudflare.net:465, AUTH LOGIN, MAIL/RCPT/DATA — by hand.