title: need to read Spo2 and PRbpm from Pulse oximeter
body: <p>This is the JSON that i have found. The service UUID is : <code>636F6D2E-6A69-7561-6E2E-504F56313100</code> and characteristic UUID is : <code>7274782E-6A69-7561-6E2E-504F56313100</code> for reading the data from oximeter, I only have these two things, <strong>but i dont know what Hex i need to send to retrive the SpO2 and PRbpm.</strong> </p>
  
  <pre><code>{
    "name": "Pulse Oximeter",
    "id": "D0:5F:B8:3D:4D:25",
    "rssi": -65,
    "services": [
      "1800",
      "1801",
      "636f6d2e-6a69-7561-6e2e-504f56313100",
      "180a"
    ],
    "characteristics": [
      {
        "service": "1800",
        "characteristic": "2a00",
        "properties": [
          "Read",
          "WriteWithoutResponse",
          "Write"
        ]
      },
      {
        "service": "1800",
        "characteristic": "2a01",
        "properties": [
          "Read"
        ]
      },
      {
        "service": "1800",
        "characteristic": "2a02",
        "properties": [
          "Read",
          "Write"
        ]
      },
      {
        "service": "1800",
        "characteristic": "2a03",
        "properties": [
          "Write"
        ]
      },
      {
        "service": "1800",
        "characteristic": "2a04",
        "properties": [
          "Read"
        ]
      },
      {
        "service": "1801",
        "characteristic": "2a05",
        "properties": [
          "Indicate"
        ],
        "descriptors": [
          {
            "uuid": "2902"
          }
        ]
      },
      {
        "service": "636f6d2e-6a69-7561-6e2e-504f56313100",
        "characteristic": "7274782e-6a69-7561-6e2e-504f56313100",
        "properties": [
          "WriteWithoutResponse",
          "Write",
          "Notify"
        ],
        "descriptors": [
          {
            "uuid": "2902"
          },
          {
            "uuid": "2901"
          }
        ]
      },
      {
        "service": "180a",
        "characteristic": "2a23",
        "properties": [
          "Read"
        ]
      },
      {
        "service": "180a",
        "characteristic": "2a24",
        "properties": [
          "Read"
        ]
      },
      {
        "service": "180a",
        "characteristic": "2a25",
        "properties": [
          "Read"
        ]
      },
      {
        "service": "180a",
        "characteristic": "2a26",
        "properties": [
          "Read"
        ]
      },
      {
        "service": "180a",
        "characteristic": "2a27",
        "properties": [
          "Read"
        ]
      },
      {
        "service": "180a",
        "characteristic": "2a28",
        "properties": [
          "Read"
        ]
      },
      {
        "service": "180a",
        "characteristic": "2a29",
        "properties": [
          "Read"
        ]
      },
      {
        "service": "180a",
        "characteristic": "2a2a",
        "properties": [
          "Read"
        ]
      },
      {
        "service": "180a",
        "characteristic": "2a50",
        "properties": [
          "Read"
        ]
      },
      {
        "service": "180a",
        "characteristic": "2a30",
        "properties": [
          "Read"
        ]
      },
      {
        "service": "180a",
        "characteristic": "2a31",
        "properties": [
          "Read"
        ]
      }
    ]
  }
  </code></pre>