for get all config in one line (parse and view in web)
REQ: GET /api/config
RES: {"value": string }

save for each key val strings 
REQ: POST /api/config
PARAM: key=val
RES: 200 OK| error message

get stats about eth status
REQ: GET /api/state (?demo=1)
RES: { "ifaces":[ item, ...., item] }

item:  {"title": "Enternet 123",
          "ip": "192.38.12.22",
          "output": "12.0 Kbps"
          }
