Send UDP commands using Batch script?

Question

This is sort of a basic question, there's just one piece of the puzzle that I'm missing somewhere. I'm trying to write a batch script to change my smart home light bulbs to a specific color using netcat and UDP commands. If I open command prompt, type this:

ncat -u 192.168.1.3 38899

A connection is established successfully to my smart light bulb, and then I can type this:

{"id":1,"method":"setPilot","params":{"r":0,"g":0,"b":255,"dimming":100}}

Which sends the UDP message to the bulb, and successfully changes it to blue. The problem is I can't seem to get this process down to one line of code for use in a batch script, for example if I send this in a command line window:

ncat -u 192.168.1.3 38899 {"id":1,"method":"setPilot","params":{"r":0,"g":0,"b":255,"dimming":100}}

I get an error that I'm trying to specify more than one port. If called from a batch script, the connection will establish, then pause, and I can then send the UDP command by typing it into the open cmd window, but that defeats the purpose. I'm sure this is a simple solution that I'm just not aware of, would someone be able to help me out? Thanks.

Sean McNally · Accepted Answer · 2022-08-13 18:37:46Z

2

I found a solution! If I type

echo {"id":1,"method":"setPilot","params":{"r":0,"g":0,"b":255,"dimming":100}} | ncat -u -w 1 192.168.1.95 38899

It works! Basically, echoing my command, without quotes, then a pipe | then my ncat connection. Hope this helps anyone else trying to do the same thing.

answered Aug 13, 2022 at 18:37

Sean McNally

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