Formatting UDP hexadecimal packets

[Andrew Jawitz]

While specific info that could help me create a custom node for MiLight/LimitlessLED Smart bulbs appears to be tough to come by, I thought I would take things step by step by testing whether or not I can configure the function node to control the lights via UDP commands.

 According to the reference at http://www.limitlessled.com/dev/ 

All UDP Commands are 3 Bytes. First byte is from the list below [All On, All Off etc], plus a fixed 2 byte suffix of 0x00 (decimal: 0) and 0x55 (decimal: 85)

 Therefore, 

 to turn all RGBW COLOR LimitlessLED Smart lights to ON then send the TCP/IP UDP packet of:  0x42 0x00 0x55

  So I'm trying to set up a test flow consisting of an Inject node, a Function node, and a UDP Out and Debug  node configured as outputs.  I have configured the UDP Out node with the ip address of the wifi-hub and the port of 8899 (as specified by the LimitlessLED documentation).

  I can't find any other examples in the flow library that might be able to serve as a template, but I would greatly appreciate any advice on how best to set this test flow up.  Specifically, I would really appreciate any advice about how to format the TCP/IP UDP packet in the Function node.

[Dave C-J]

Hi,

in your function just define a Buffer as an array of bytes....

msg.payload = new Buffer([ 0x42, 0x00, 0x55 ]);

and you should be on the way.