Octoprint

[
    {
        "id": "16e7dffe125168a0",
        "type": "inject",
        "z": "07fcc1e9c415d5a8",
        "name": "Start",
        "props": [
            {
                "p": "payload"
            },
            {
                "p": "topic",
                "vt": "str"
            }
        ],
        "repeat": "60",
        "crontab": "",
        "once": true,
        "onceDelay": "1",
        "topic": "",
        "payload": "",
        "payloadType": "date",
        "x": 350,
        "y": 280,
        "wires": [
            [
                "0de3133e6fcdaefc"
            ]
        ]
    },
    {
        "id": "7da992173b2032d3",
        "type": "mqtt out",
        "z": "07fcc1e9c415d5a8",
        "name": "Custom App",
        "topic": "AWTRIX_PREFIX_HERE/custom/Octoprint",
        "qos": "1",
        "retain": "false",
        "respTopic": "",
        "contentType": "",
        "userProps": "",
        "correl": "",
        "expiry": "",
        "broker": "7ab578ded1bbee4f",
        "x": 990,
        "y": 280,
        "wires": []
    },
    {
        "id": "0de3133e6fcdaefc",
        "type": "http request",
        "z": "07fcc1e9c415d5a8",
        "name": "",
        "method": "GET",
        "ret": "obj",
        "paytoqs": "ignore",
        "url": "http://INSERT-IP-HERE/api/job",
        "tls": "",
        "persist": false,
        "proxy": "",
        "insecureHTTPParser": false,
        "authType": "bearer",
        "senderr": false,
        "headers": [],
        "x": 530,
        "y": 280,
        "wires": [
            [
                "be0d4703729e31b2",
                "5da7379ac3bec2dc"
            ]
        ]
    },
    {
        "id": "be0d4703729e31b2",
        "type": "debug",
        "z": "07fcc1e9c415d5a8",
        "name": "Debug API response",
        "active": false,
        "tosidebar": true,
        "console": false,
        "tostatus": false,
        "complete": "payload",
        "targetType": "msg",
        "statusVal": "",
        "statusType": "auto",
        "x": 560,
        "y": 360,
        "wires": []
    },
    {
        "id": "1c8286d28e93ab36",
        "type": "comment",
        "z": "07fcc1e9c415d5a8",
        "name": "Insert API token and octoprint adress here",
        "info": "",
        "x": 540,
        "y": 240,
        "wires": []
    },
    {
        "id": "5da7379ac3bec2dc",
        "type": "function",
        "z": "07fcc1e9c415d5a8",
        "name": "To Matrix",
        "func": "// Make sure payload exists\nif (!msg.payload || !msg.payload.progress) {\n    node.warn(\"Payload missing progress field: \" + JSON.stringify(msg.payload));\n    return null; // shouldn't happen but stops if data isn't in expected format\n}\n\nvar completion = msg.payload.progress.completion;\nvar timeleft   = msg.payload.progress.printTimeLeft;\nvar state      = msg.payload.state; // <-- string (e.g. \"Operational\", \"Printing\", \"Offline\")\nvar icon       = 68577;\n\n// Printer offline/not connected but octoprint is reachable = stop sending, let lifetime kill the app\nif (state === \"Offline\" || state === \"Closed\" || state === \"Error\") {\n    return null;\n}\n\n// Printer active but not printing\nif (state === \"Operational\") {\n    msg.payload = {\n        \"text\": \"Ready\",\n        \"icon\": icon,\n        \"pushIcon\": 0,\n        \"lifetime\": 180\n    };\n    return [msg, null];\n}\n\n// Printer is printing\nif (state === \"Printing\" && completion != null && timeleft != null) {\n    completion = completion.toFixed(0);\n    var hours = Math.floor(timeleft / 3600);\n    var mins  = Math.round((timeleft % 3600) / 60);\n\n    let text = (hours === 0) ? (mins + \" min\") : (hours + \" h \" + mins + \" min\");\n\n    msg.payload = {\n        \"text\": text,\n        \"icon\": icon,\n        \"pushIcon\": 0,\n        \"lifetime\": 180,\n        \"progress\": Number(completion),\n    };\n    return [msg, null];\n}\n\n// Default = send nothing, let lifetime kill the app\nreturn null;\n",
        "outputs": 1,
        "timeout": 0,
        "noerr": 0,
        "initialize": "",
        "finalize": "",
        "libs": [],
        "x": 760,
        "y": 280,
        "wires": [
            [
                "7da992173b2032d3"
            ]
        ]
    },
    {
        "id": "7ab578ded1bbee4f",
        "type": "mqtt-broker",
        "name": "localhost",
        "broker": "localhost",
        "port": "1883",
        "clientid": "",
        "autoConnect": true,
        "usetls": false,
        "protocolVersion": "4",
        "keepalive": "60",
        "cleansession": true,
        "autoUnsubscribe": true,
        "birthTopic": "",
        "birthQos": "0",
        "birthPayload": "",
        "birthMsg": {},
        "closeTopic": "",
        "closeQos": "0",
        "closePayload": "",
        "closeMsg": {},
        "willTopic": "",
        "willQos": "0",
        "willPayload": "",
        "willMsg": {},
        "userProps": "",
        "sessionExpiry": ""
    }
]

These icons belong on the device, in /ICONS. Each one is at most 32×8 pixels — shown here magnified, at their real proportions.