[
    {
        "id": "water_in",
        "type": "http in",
        "name": "POST /water",
        "url": "/water",
        "method": "post",
        "upload": false,
        "swaggerDoc": "",
        "x": 170,
        "y": 160,
        "wires": [
            [
                "water_debug",
                "water_resp",
                "water_status"
            ]
        ]
    },
    {
        "id": "water_resp",
        "type": "http response",
        "name": "200 OK",
        "statusCode": "200",
        "headers": {},
        "x": 500,
        "y": 240,
        "wires": []
    },
    {
        "id": "water_debug",
        "type": "debug",
        "name": "reading",
        "active": true,
        "tosidebar": true,
        "console": false,
        "tostatus": false,
        "complete": "payload",
        "targetType": "msg",
        "statusVal": "",
        "statusType": "auto",
        "x": 490,
        "y": 100,
        "wires": []
    },
    {
        "id": "water_status",
        "type": "function",
        "name": "depth or fault",
        "func": "// The node reports failures explicitly rather than going silent, so a\n// message with ok:false means the ESP is alive and the probe is not.\n// That's a different repair job from no messages at all.\nif (msg.payload.ok === false) {\n    node.status({ fill: \"red\", shape: \"ring\", text: \"probe fault: \" + msg.payload.error });\n    return null;\n}\n\nconst mm = msg.payload.depth_mm;\nlet text = mm + \" mm\";\nif (msg.payload.percent !== undefined) text += \"  (\" + msg.payload.percent + \"%)\";\n\nnode.status({ fill: \"green\", shape: \"dot\", text: text });\nreturn { payload: mm, topic: msg.payload.node };\n",
        "outputs": 1,
        "timeout": 0,
        "noerr": 0,
        "initialize": "",
        "finalize": "",
        "libs": [],
        "x": 500,
        "y": 170,
        "wires": [
            []
        ]
    },
    {
        "id": "water_notes",
        "type": "comment",
        "name": "Farmers IoT Toolkit — Module 1 water level",
        "info": "Receives readings from the ESP8266 water level node.\n\nThe ESP POSTs JSON like:\n\n    {\"node\":\"water-tank-1\",\"ok\":true,\"raw\":153,\n     \"depth_mm\":127,\"percent\":47.6,\"rssi\":-62,\"uptime_s\":1234}\n\nA failed sensor read still POSTs, with ok:false and an error\nstring — a silent node is indistinguishable from dead WiFi or a\nflat battery, so the node says so instead.\n\nIMPORTANT: the `http response` node is not optional. Without it\nthe request never completes and the ESP sits there until it times\nout. Every `http in` needs one.\n\nTest without any hardware:\n\n    curl -X POST http://192.168.43.1:1880/water \\\n         -H 'Content-Type: application/json' \\\n         -d '{\"node\":\"test\",\"ok\":true,\"depth_mm\":500}'\n",
        "x": 210,
        "y": 100,
        "wires": []
    }
]