HTTP JSON Sensor Data

• all Sensor data is available in a generic JSON Object presentet by status.json
• there are two relevant sub-objects: sensor_values and sensor_descr
• sensor_descr can tell:
  • what sensor types are actually relevent
  • what is type-specifiv sensor-field descripton
  • how many sensors of each type are actually present
  • what are the names of each of such sensors
• sensor_values tells you about the sensor values, matching the description explained above
• it's common practice to get sensor_descr+sensor_values once, and poll sensor_values only subsequently

• HTTP-Get status.json?components=8470528
  • here, 8470528 sums up sensor_values (16384 aka 0x10000) plus sensor_descr (65536 aka 0x4000), plus the ‘extended’ marker (0x800000) to get both simple sensors and complex sensor groups
  • 0x4000 + 0x10000 + 0x800000 = 8470528

A sensor description might look like this:

• all Sensor data is available in a generic JSON Object presentet by status.json
• there are two relevant sub-objects: sensor_values and sensor_descr
• sensor_descr can tell:
  • what sensor types are actually relevent
  • what is type-specifiv sensor-field descripton
  • how many sensors of each type are actually present
  • what are the names of each of such sensors
• sensor_values tells you about the sensor values, matching the description explained above
• it's common practice to get sensor_descr+sensor_values once, and poll sensor_values only subsequently

• HTTP-Get status.json?components=8470528
  • here, 8470528 sums up sensor_values (16384 aka 0x10000) plus sensor_descr (65536 aka 0x4000), plus the ‘extended’ marker (0x800000) to get both simple sensors and complex sensor groups
  • 0x4000 + 0x10000 + 0x800000 = 8470528

A sensor description might look like this:

 [
   {
     "type": 664,
     "num": 2,
     "fields": [
        {"name": "Voltage", "unit": "V", "decPrecision": 3},
        {"name": "Current", "unit": "A", "decPrecision": 1}
     ]
     "properties": [
       { "id": "L1", "name": "Meter1", "state": 1},
       { "id": "L2", "name": "Meter2", "state": 1},
     ]
   },
   {
     "type": 665,
     "num": 1,
     "fields": [
        {"name": "Temperature", "unit": "C", "decPrecision": 1},
        {"name": "Humidity",    "unit": "%", "decPrecision": 1}
     ]
     "properties": [
       { "id": "6102", "name": "Server-Rack", "state": 1}
     ]
   }
 ]