I'm using a software that lets me read a data on it's server using this function :
webMI.data.read(nodeID, function(e){...})
Passes a current property object for every data variable specified by its nodeID to the callback function. You can pass a single nodeID or an array of nodeIDs.
In the callback i get the value i want, but i couldn't get it out and didn't want to make a callback hell After some reading/testing on asyncronous function, i tried using promise but i keep getting the same error and i don't understand why
webMI.data.read("AGENT.OBJECTS.motor.isActive",e => e.value)
.then(result => {
console.log(result)
})
Uncaught TypeError: webMI.data.read(...) is undefined
I also tried to put it in an async function and using await
async function GetValue(){
var temp = await webMI.data.read("AGENT.OBJECTS.motor.isActive",function(e){return e.value})
return temp
}
But temp always return a Promise with state = fullfilled and value = undefined
My goal is to get 1 to X values this way to make a formula
Note that i have no way to modify 'webMI.data.read'
Use the promise constructor and resolve from within the callback
function GetValue(){
return new Promise(resolve => {
webMI.data.read("AGENT.OBJECTS.motor.isActive",function(e){resolve(e.value)})
})
}
Now the GetValue function is async, as it returns a promise and can be awaited.