I am connecting an Arduino through MQTT to Node RED. This arduino sends me the following string "Temperature: 28.0". Then I have another plate that gets the humidity and dows it in the form of string "Humidity: 50". When receiving data by Node RED I get the string, but I'm not able to convert them to JSON because I have to deliver dweet.io to display the data, and this program asks me JSON.
Let's see if you can help me out!
I do not really know much about arduinos, but in nodejs there is a way to do what you want, I have devised a method that returns an object given an array of strings of the form 'abcd: 123'
function getValue (arrayString) {
var obj = {};
arrayString.forEach((string) => {
var elementIndex = 0
for(var i = 0; i < string.length; i++) {
if(string[i] == ':') {
elementIndex = i;
break;
}
}
str = string.substring(0, elementIndex);
val = string.substring(elementIndex+1, string.length)
obj[str] = parseFloat(val, 10);
});
return obj;
}
arrayString = [
'Temperatura:28.0',
'Humedad:50',
]
var obj = getValue(arrayString);
console.log(obj);
console.log(JSON.stringify(obj)); If you call getValue with your string array, you should return an object the way you want, if you want it as a string, call JSON.stringify(obj) .
I hope my answer will help you