[
  {
    "id": "tab_saia_api",
    "type": "tab",
    "label": "SAIA HTTP-API",
    "info": "REST-Endpunkte für das React-Dashboard.\nGET  /saia/read?type=register&addr=0&count=1\nPOST /saia/write  {type, addr, value}"
  },
  {
    "id": "cfg_saia",
    "type": "saia-config",
    "name": "SAIA PCD",
    "host": "192.168.1.100",
    "port": 5050,
    "station": 1,
    "timeout": 2000
  },

  {
    "id": "http_read_in",
    "type": "http in",
    "z": "tab_saia_api",
    "name": "GET /saia/read",
    "url": "/saia/read",
    "method": "get",
    "x": 120, "y": 80,
    "wires": [["fn_read_parse"]]
  },
  {
    "id": "fn_read_parse",
    "type": "function",
    "z": "tab_saia_api",
    "name": "Query → msg",
    "func": "msg.itemType = msg.req.query.type  || 'register';\nmsg.address  = parseInt(msg.req.query.addr)  || 0;\nmsg.count    = parseInt(msg.req.query.count) || 1;\nreturn msg;",
    "x": 310, "y": 80,
    "wires": [["saia_read_api"]]
  },
  {
    "id": "saia_read_api",
    "type": "saia-read",
    "z": "tab_saia_api",
    "name": "Read",
    "server": "cfg_saia",
    "itemType": "register",
    "address": 0,
    "count": 1,
    "x": 490, "y": 80,
    "wires": [["fn_read_response"]]
  },
  {
    "id": "fn_read_response",
    "type": "function",
    "z": "tab_saia_api",
    "name": "→ JSON",
    "func": "msg.payload = { value: msg.payload, type: msg.itemType, addr: msg.address };\nmsg.statusCode = 200;\nreturn msg;",
    "x": 650, "y": 80,
    "wires": [["http_read_out"]]
  },
  {
    "id": "http_read_out",
    "type": "http response",
    "z": "tab_saia_api",
    "name": "Response",
    "x": 810, "y": 80,
    "wires": []
  },

  {
    "id": "http_write_in",
    "type": "http in",
    "z": "tab_saia_api",
    "name": "POST /saia/write",
    "url": "/saia/write",
    "method": "post",
    "x": 120, "y": 200,
    "wires": [["fn_write_parse"]]
  },
  {
    "id": "fn_write_parse",
    "type": "function",
    "z": "tab_saia_api",
    "name": "Body → msg",
    "func": "const b = msg.payload;\nmsg.itemType = b.type  || 'register';\nmsg.address  = parseInt(b.addr) || 0;\nmsg.payload  = b.value;\nreturn msg;",
    "x": 310, "y": 200,
    "wires": [["saia_write_api"]]
  },
  {
    "id": "saia_write_api",
    "type": "saia-write",
    "z": "tab_saia_api",
    "name": "Write",
    "server": "cfg_saia",
    "itemType": "register",
    "address": 0,
    "x": 490, "y": 200,
    "wires": [["fn_write_response"]]
  },
  {
    "id": "fn_write_response",
    "type": "function",
    "z": "tab_saia_api",
    "name": "→ JSON",
    "func": "msg.payload = { ok: true };\nmsg.statusCode = 200;\nreturn msg;",
    "x": 650, "y": 200,
    "wires": [["http_write_out"]]
  },
  {
    "id": "http_write_out",
    "type": "http response",
    "z": "tab_saia_api",
    "name": "Response",
    "x": 810, "y": 200,
    "wires": []
  },

  {
    "id": "http_err",
    "type": "catch",
    "z": "tab_saia_api",
    "name": "Fehler",
    "x": 490, "y": 320,
    "wires": [["fn_err"]]
  },
  {
    "id": "fn_err",
    "type": "function",
    "z": "tab_saia_api",
    "name": "Error → JSON",
    "func": "msg.payload = { ok: false, error: msg.error.message };\nmsg.statusCode = 500;\nreturn msg;",
    "x": 660, "y": 320,
    "wires": [["http_err_out"]]
  },
  {
    "id": "http_err_out",
    "type": "http response",
    "z": "tab_saia_api",
    "name": "Response",
    "x": 820, "y": 320,
    "wires": []
  }
]