Generic I/O (function 17)

A general-purpose input/output module: two relay outputs, two digital inputs and two analogue voltage inputs. It is what gets used for equipment that has no MUXEN interface of its own — a switch to read, a pump to energise, a sender to measure.

Published

device/17/<i>/life

metadata adds counter; expireAfterSec: 30.

data field	Type	Unit	Description
relay0, relay1	bool	—	Relay states
input0, input1	bool	—	Digital inputs
ana0, ana1	number (3 dec)	V	Analog inputs (signed)

{
  "data": {
    "relay1": false,
    "relay0": true,
    "input1": false,
    "input0": true,
    "ana0": 3.271,
    "ana1": 0.045
  },
  "metadata": {
    "rxdate": "2026-06-17T14:30:45.123Z",
    "rxTimestamp": 1781793045,
    "expireAfterSec": 30,
    "counter": 2
  }
}

device/17/<i>/testcanhost

metadata adds counter; expireAfterSec: 30. data is empty — payload is the metadata counter only.

{
  "data": {},
  "metadata": {
    "rxdate": "2026-06-17T14:30:45.123Z",
    "rxTimestamp": 1781793045,
    "expireAfterSec": 30,
    "counter": 3
  }
}

mosquitto_sub -h 127.0.0.1 -t 'device/17/+/#' -v

Command — device/17/<i>/command

Regex ^device/17/([[:digit:]]+)/command$. channel must be a JSON integer 0-15 or dropped. If both true → requestOn cleared.

Field	Type	Description
channel	int 0-15	Target channel
requestOn	bool	Enable channel
requestOff	bool	Disable channel

mosquitto_pub -h 127.0.0.1 -t 'device/17/0/command' -m '{"channel":3,"requestOn":true}'
mosquitto_pub -h 127.0.0.1 -t 'device/17/0/command' -m '{"channel":3,"requestOff":true}'