I have an MQTT client in C# using MQTTnet and it’s listening to an MQTT broker which uses SparkPlug B.

I get the following messages at spBv1.0/ClientEU1/DDATA/27352352/HART0 :

{
  "timestamp" : 1722602588274,
  "metrics" : [ {
    "alias" : 140,
    "timestamp" : 1722602588274,
    "dataType" : "Float",
    "value" : 10.798176
  }, {
    "alias" : 141,
    "timestamp" : 1722602588274,
    "dataType" : "Float",
    "value" : 89.23861
  }, {
    "alias" : 143,
    "timestamp" : 1722602588274,
    "dataType" : "Float",
    "value" : 11.935791
  }, {
    "alias" : 147,
    "timestamp" : 1722602588274,
    "dataType" : "Float",
    "value" : 21.064209
  } ],
  "seq" : 56
}

and this one at spBv1.0/ClientEU1/NDATA/27352352

{
  "timestamp" : 1722602588274,
  "metrics" : [ {
    "alias" : 31,
    "timestamp" : 1722602588274,
    "dataType" : "Float",
    "value" : -15.5
  }, {
    "alias" : 39,
    "timestamp" : 1722602588274,
    "dataType" : "UInt32",
    "value" : 10766
  }, {
    "alias" : 75,
    "timestamp" : 1722602588274,
    "dataType" : "Float",
    "value" : -0.06145418
  }, {
    "alias" : 76,
    "timestamp" : 1722602588274,
    "dataType" : "Float",
    "value" : -0.06145418
  } ],
  "seq" : 57
}

• Given that the metrics have aliases, how can I find out the names of these aliases?
• Should I use DCMD and NCMD to do REBIRTH? How should I do it in MQTTnet if that’s the approach to get the details of the metrics?