Convert

[adisti...@gmail.com]

Hi everyone,

I need your help because I am new to Node-RED. I tried to send data from BME to cloud with smart mesh. In the node RED, I received a message that looks like this:

4‎/‎21‎/‎2017‎ ‎2‎:‎46‎:‎45‎ ‎PMnode: mote events/responsesiot-2/type/mote/id/00-17-0d-00-00-58-f2-6c/evt/notifData/fmt/json : msg.payload : Object

 

{ d: object }object

d: object

utcSecs: 1029561249

utcUsecs: 536750

macAddress: "00-17-0d-00-00-58-f2-6c"

srcPort: 60000

dstPort: 60000

data: array[5]

0: 50

1: 53

2: 46

3: 52

4: 51

I need the array of data to be converted to temperature, in this case it’s 25.43. I tried to convert it to decimal, but failed several times. Can anyone help me? It is really appreciated. Thank you.

Ixora

[Julian Knight]

What kind of data is in that array? characters? a buffer?

On Saturday, 22 April 2017 11:01:40 UTC+1, adisti...@gmail.com wrote:

Hi everyone,

I need your help because I am new to Node-RED. I tried to send data from BME to cloud with smart mesh. In the node RED, I received a message that looks like this:

data: array[5]

[adisti...@gmail.com]

Hi,

It kinds of characters but I can't find the type of data. However, someone in this group told me to change it to buffer first before converting it, and it works fine. Thank you very much.

[Neil Cherry]

This one looks pretty easy. I'm used to thinking in C so the array would contain 5, 8 bit values which is an ASCII string ( yes I can read ASCII in hex and decimal formats ;-) ). I did a quick search and found this on Stack Exchange:

http://stackoverflow.com/questions/14028148/convert-integer-array-to-string-at-javascript

// You already have d.data[5] so ..

var i, str = '';

for(i = 0; i < d.data.length; i++) {

    str += '%' + ('0'+ d.data[i].toString(16)).slice(-2);

}

var nstr = decodeURIComponent(str);

There's probably an easier way but this was a quick search.