Introduce energy monitoring based on RFID user cards

[oh2th]

On APIv1 - RFID cards are single variables in the response to "status" query

Index	Card num	Card name	Card energy
1	rca	rna	eca
2	rcr	rnm	ecr
3	rcd	rne	ecd
4	rc4	rn4	ec4
5	rc5	rn5	ec5
6	rc6	rn6	ec6
7	rc7	rn7	ec7
8	rc8	rn8	ec8
9	rc9	rn9	ec9
10	rc1	rn1	ec1

For example first card would have:

• rca: "1" - card index of the paired RFID card or empty
• rna: "Tapio" - name given, max 10 chars
• eca: "5835" - energy counter (= 583.5 kWh)

"eca": "5835",
"ecr": "0",
"ecd": "0",
"ec4": "0",
"ec5": "0",
"ec6": "0",
"ec7": "0",
"ec8": "0",
"ec9": "0",
"ec1": "0",
"rca": "1",
"rcr": "",
"rcd": "",
"rc4": "",
"rc5": "",
"rc6": "",
"rc7": "",
"rc8": "",
"rc9": "",
"rc1": "",
"rna": "Tapio",
"rnm": "n/a",
"rne": "n/a",
"rn4": "n/a",
"rn5": "n/a",
"rn6": "n/a",
"rn7": "n/a",
"rn8": "n/a",
"rn9": "n/a",
"rn1": "n/a",

On APIv2 - RFID cards are in a JSON-array in response to "/api/status?filter=cards,trx" query

• trx
  • null, for no transaction
  • 0, active transaction without RFID card
  • 1-10, active transaction with RFID card
• cards-array - ten groups of
  • name - name given, max 10 chars
  • energy - energy counter in Wh (583524 = 583.524 kWh)
  • cardId - true or false if a RFID card is paired to the slot or not

{
  "trx":null,
  "cards":[
    {
      "name":"Tapio",
      "energy":583524,
      "cardId":true
    },
    {
      "name":"n/a",
      "energy":0,
      "cardId":false
    },
    {
      "name":"n/a",
      "energy":0,
      "cardId":false
    },
    {
      "name":"n/a",
      "energy":0,
      "cardId":false
    },
    {
      "name":"n/a",
      "energy":0,
      "cardId":false
    },
    {
      "name":"n/a",
      "energy":0,
      "cardId":false
    },
    {
      "name":"n/a",
      "energy":0,
      "cardId":false
    },
    {
      "name":"n/a",
      "energy":0,
      "cardId":false
    },
    {
      "name":"n/a",
      "energy":0,
      "cardId":false
    },
    {
      "name":"n/a",
      "energy":0,
      "cardId":false
    }
  ]
}