[Дядя Вова]

Макрос http://192.168.0.257/shmem.php?cmd=get-variables
Дает выхлоп:

[{"name":"\u0412\u044b\u0445\u043e","src":"mb","value":0,"type":"bool","direction":"out"},{"name":"\u0412\u0445\u043e\u0434","src":"mb","value":0,"type":"bool","direction":"in"}]

Добавление в этот скрипт заголовка:
header('Content-Type: text/html; charset=utf-8');
корректирует это:

/ 20210403124941
// http://192.168.0.257/shmem.php?cmd=get-variables

[
  {
    "name": "Выход",
    "src": "mb",
    "value": 0,
    "type": "bool",
    "direction": "out"
  },
  {
    "name": "Вход",
    "src": "mb",
    "value": 0,
    "type": "bool",
    "direction": "in"
  }
]