The palette

Written against main

This page follows main at f1f417f, and it differs from the copy in HotLoop Flow 2.2.0, the latest release. Parts of it may be newer than what you have installed. The release notes say what moved.

75 node types.

Category	Nodes
Common	inject, debug, complete, catch, status, link in, link out, comment, junction
Function	function, switch, change, range, template, delay, trigger, exec, rbe
Network	mqtt in/out, http in, http response, http request, websocket in/out, tcp in/out, tcp request, udp in/out, modbus read/write, s7 read/write, ethernetip read/write, opcua read/write/subscribe, sparkplug in/out/command, hotloop in/state/script/recipe
Sequence	split, join, sort, batch
Parser	csv, html, json, xml, yaml
Storage	file, file in, watch, influxdb out, postgres
Discover	scan, netinfo, for inventorying an OT segment
Config	mqtt-broker, websocket-listener, websocket-client, influxdb, postgres, modbus, s7, ethernetip, opcua, sparkplug, hotloop

scan sweeps a CIDR range and identifies Modbus and EtherNet/IP endpoints, and netinfo reports the interfaces the runtime can actually see, which in macvlan mode is how a flow discovers its own address on the OT VLAN. Modbus TCP, S7, EtherNet/IP, OPC UA and Sparkplug B nodes can talk to what scan finds now, and they’re the next section.

One Go descriptor per node type declares its properties, ports, defaults and help text, and the editor renders the dialog from it, so a node can’t ship with a dialog that disagrees with its runtime.