readPropertyMultiple errorCode:31

[stefano055415]

I am trying to read the data of an analogInput device, but I always get an errorCode: 31

request

const requestArray = [{
objectId: {
type: 0,
instance: 0
},
properties: [{
id: 85
}]
}];
client.readPropertyMultiple('192.168.86.61', requestArray, (err, value) => {
console.log('value: ', JSON.stringify(value));
console.log('Error:', err);
});

response

value: {"len":15,"values":[{"objectId":{"type":0,"instance":0},"values":[{"id":85,"index":4294967295,"value":[{"type":105,"value":{"errorClass":1,"errorCode":31}}]}]}]}
Error: null

thanks

[Craigzyc]

I'm getting this identical response on both readPropertyMultiple and readProperty. My code is similar. @stefano055415 Did you get anywhere with this?

[fh1ch]

Please see https://github.com/fh1ch/node-bacstack/blob/master/FAQ.md#i-receive-the-error-bacneterror---class-x---code-y-what-does-this-mean. The error {"errorClass": 1,"errorCode": 31} means: OBJECT - UNKNOWN_OBJECT.

You try to read instance 0 of object o, which is not a valid BACNET object. Try something like {objectId: {type: 8, instance: 4194303}, properties: [{id: 8}]}, which returns all properties from the device object.

The fact that you receive an error also indicates, that the device is reachable and acts according to specs.