SNMP GET Opaque data type results in hex values

Add-ons Bindings
, ,
1

I’m using the SNMP binding with OH2 and trying to get that battery value from my UPS connected through my Synology DiskStation.

I can read out OctetString and Integer values, but when it comes to Opaque, I get hex values back.

I’ve tried both Number and String, but only String actually return values…

String NAS_UPS_BATT "Battery on the UPS [%s %%]" { snmp="<[192.168.x.x:public:.1.3.6.1.4.1.6574.4.3.1.1.0:10]" }

Any ideas on this?

Thanks!
Thomas

2

I have exactly the same problem. Nodody else with that problem?

3

It’s been a while since this was posted, but since it showed up in my search, it might in others’ too.
The hex values are an encoded float, see https://stackoverflow.com/questions/35276556/snmpsharpnet-opaque-float. You can do the conversion via a JavaScript transform:

(function(input) {
    var bytes = input.split(":");
    if(bytes.length != 7 || bytes[0] != "9f" || bytes[1] != "78" || bytes[2] != "04") return input;
    var view = new DataView(new ArrayBuffer(4));
    for (i = 0; i < 4; i++) {
       var byteValue = parseInt("0x" + bytes[3 + i]);
       view.setInt8(i,byteValue);
    }
    return view.getFloat32(0);
})(input)

Save this as opaqueFloat.js in the transform folder. Then you can use it as follows:

Number UPS_BatteryLevel "UPS Battery Level [%d %%]" {snmp="<[nas:public:1.3.6.1.4.1.6574.4.3.1.1.0:10000:JS(opaqueFloat.js)]"}