I can't write on Modbus

[admin]

You have to add these fields, "writable": true must still be in the entry.

Code:

{
  "name": "Demande User",
  "bus_datatype": "uint16",
  "type": "register",
  "address": 257,
  "writable": true,
  "datatype": "uint16",
  "write_multiple": true,
  "value_custom": {
    "0": "holiday",
    "1": "daily",
    "2": "cooking",
    "3": "guest"
  }
}

Modbus has two different functions for writing single and multiple registers. Some devices support only the multiple write function. If write_multiple is enabled then LM will use multiple write function when writing to a single register.