Encoding 4-byte signed value

[aabbas]

Hi, I have a KNX Energy saver and I am using Node-RED to visualize the consumption. The type of msg.payload is 4-byte signed value.

" 09/11/2018 à 12:43:50node: 3156fe23.2366e2knx: write : msg.payload : Object

object

srcphy: "3.1.8"

dstgad: "7/6/5"

value: buffer[4]raw

0: 0x0

1: 0x0

2: 0x0

3: 0x33
"
I want to convert the buffer in decimal value.

Thank you for your help.

[ukmoose]

did the answer you were given last time you asked this question not work?

How can I convert a buffer [4] into a number value?

Here is a nice reference for reading/writing buffers on the W3Schools site. For instance, if you just want to replace the 4-byte payload buffer with its 32-bit signed big-endian integer value, try this: msg.payload = msg.payload.readInt32BE(); return msg;

[aabbas]

I obtain the right values. Thank you