COT.

Set environment variable

You will need to set up the global environment variable CIRCUSTOKEN. This helps the server to recognize you as a valid user.
Place it at the end of your /etc/bash.bashrc file, like this:

export CIRCUSTOKEN=your_token_here

Bear in mind that all is case sensitive here.
To find your token, log in the site, go to up-right corner photo and select account. Copy the token and substitute in the variable above.
The new variable won't be ready until you close your terminal and open a new one.
Check that everything is OK typing this:

echo $CIRCUSTOKEN

Get the commands

Follow these steps to get the circus commands available in your machine.
* Make a temporary directory and get in it

sudo mkdir ~/temp
cd ~/temp

* Get the debian package with all you need from our site

sudo wget https://circusofthings.com/downloads/debian/circusdebianlib_1.1-1.deb

* Unpack it and let it be installed

sudo dpkg -i circusdebianlib_1.1-1.deb

* Give permissions to the new files to be executable by your user

sudo chmod 755 /usr/local/bin/circus*

It should be ready now

You can write your signal value from CLI
For instance, if you would like to write a "100" value on signal defined by key "2717"

circuswritesignal -k 2717 -n 100

You can read your signal value from CLI
For instance, if you would like to read the value on signal defined by key "2717"

circusreadsignal -k 2717

Of course, remember to use another signal rather than "2717" for which you are allowed to write or read.
Consider using the "-v" verbose option if you need a bit more of debug. Skip it if you want to embed the command in some pipelining.