Nodes

LOOPZE ships a curated set of built-in nodes grouped by purpose.

Input

Node	What it does
Inject	Manually or periodically send a message.
Modbus	Read / poll Modbus TCP or RTU registers.
OPC UA	Read / subscribe to OPC UA nodes.
S7 Read	Read variables or raw blocks from a SIEMENS S7 PLC.

Output

Node	What it does
Debug	Stream messages to the editor sidebar.
OPC UA	Write to an OPC UA node.
S7 Write	Write variables or raw blocks to a SIEMENS S7 PLC.

Network

Node	What it does
HTTP In / Response / Request	Define HTTP endpoints in a flow, or call out to external HTTP services.
MQTT Subscribe	Subscribe to MQTT topics (static or dynamic, MQTT v5).
MQTT Publish	Publish to an MQTT topic, including v5 response-topic replies.
MQTT Request	Synchronous MQTT v5 request/response in one node.
TCP Receive	Listen on a TCP port (server) or dial a remote (client).
TCP Send	Reply on a session, broadcast to many, or dial a remote.
TCP Request	Synchronous TCP round-trip (dial → send → read → close).
UDP Receive	Bind a UDP port (with optional multicast).
UDP Send	Send a UDP datagram (unicast / broadcast / multicast).

Cross-cutting reference:

• Framing — strategies that turn TCP byte streams into messages.
• TLS configuration — shared TLS block for TCP-based outbound nodes.

Logic & flow control

Node	What it does
Function	Run JavaScript or expr-lang on the message.
Change	Set, copy, move or delete fields on the message.
Switch	Route messages to outputs based on rules.
Template	Render Mustache / Go templates.
Split	Split arrays / strings into multiple messages.
Join	Recombine split messages.
Delay	Delay or rate-limit the message stream.
Link In / Link Out	Cross-flow wiring without dragged wires.

Parsing

Node	What it does
Parser JSON	Encode / decode JSON.
Parser XML	Encode / decode XML.
Parser Modbus	Decode Modbus register frames.
Parser S7	Decode raw S7 byte blocks into structured objects (and back).

Industrial — SIEMENS S7

Node	What it does
S7 PLC	Connection-config node for an S7 PLC (RFC1006 / ISO-on-TCP).
S7 Read	Static / dynamic / block-mode variable reads.
S7 Write	Static / dynamic / block-mode variable writes.
S7 Parser	Decode block-mode bytes into structured objects (and back).

Filesystem

Node	What it does
File Read	Read file content on trigger; supports incremental byte-cursor tailing.
File Watch	Watch a file or directory for FS events; emits metadata only.
File Out	Write message payloads to a file (overwrite / append / create).

Diagnostics

Node	What it does
Status	Inspect the status of another node.
Catch	Catch errors emitted by other nodes.