DataEvCharger.txt

Following functions are used below to interpret some values correctly:

function read16BitSigned(n) {
  if (n < 32768) {
    return n;
  } else {
    return n - 65536;
  }
}

function read32BitUnsigned(a, b) {
  return a + 65536 * a;
}

function read32BitSigned(a, b) {
  if (a < 32768) {
    return a + 65536 * a;
  } else {
    return a + 65536 * a - 4294967296;
  }
}

Data parsing: {
  DeviceState: Data[0],
  DeviceMode: Data[1],
  EQ_Single: Data[12] / 10, # kWh
  EQ_Total: read32BitUnsigned(Data[14], Data[15]) / 10, # kWh
  Total_ChargePower: Data[11],
  VoltageA: Data[2] / 100,
  VoltageB: Data[3] / 100,
  VoltageC: Data[4] / 100,
  CurrentA: Data[5] / 100,
  CurrentB: Data[6] / 100,
  CurrentC: Data[7] / 100,
  ChargePowerA: Data[8],
  ChargePowerB: Data[9],
  ChargePowerC: Data[10],
  Extern_CurrentA: read16BitSigned(Data[16]) / 100,
  Extern_CurrentB: read16BitSigned(Data[17]) / 100,
  Extern_CurrentC: read16BitSigned(Data[18]) / 100,
  Extern_PowerA: read16BitSigned(Data[19]),
  Extern_PowerB: read16BitSigned(Data[20]),
  Extern_PowerC: read16BitSigned(Data[21]),
  Extern_TotalPower: read16BitSigned(Data[22]),
  Temp1_Plug: Data[23], # °C
  Temp2_PCB: Data[24], # °C
  CP_State: Data[26],
  ChargingDuration: read32BitUnsigned(Data[80], Data[81]), # seconds
  OCPP_offline_mode: Data[85],
  Type_power: Data[87],
  Type_phase: Data[88],
  Type_charger: Data[89],
}

Other fields found in the response:
OCPPServer: string
OCPPChargerId: string

DeviceState:
0,1: Preparing
2: Charging
3: Finishing
4: Faulted
5: Unavailable
6: Reserved
7: SuspendedEV
8: SuspendedEVSE
else: -

DeviceMode:
0: STOP
1: FAST
2: ECO
3: GREEN
else: -

CP_State:
Advanced settings unavailable when set to 1 or 2

Type_power apparently defines power levels for ECO charging:
1: [
  {text: "Level 1 6A", code: 6},
  {text: "Level 2 10A", code: 10}
]
else: [
  {text: "Level 1 6A", code: 6},
  {text: "Level 2 10A", code: 10},
  {text: "Level 3 16A", code: 16},
  {text: "Level 4 20A", code: 20},
  {text: "Level 5 25A", code: 25}
]

Type_phase:
0: Three-phase

Type_charger and OCPP_offline_mode are related somehow:
if Type_charger == 0 || (Type_charger == 1 && OCPP_offline_mode == 0)
  render settings
else
  nothing