Testing the Hub

After following the install tutorial you can now communicate with the Hub through any programming language supporting gRPC. We will be using some sample code written in Python to see what the Hub does. Download the sample code from GitHub to get started:
cd ~
git clone https://github.com/fijter/rpchub-test.git
cd rpchub-test

This example code needs to install some dependencies for Python. We don't want to pollute our global python installation with these dependencies so we create a Virtual Environment first:
sudo apt-add-repository multiverse && sudo apt update
sudo apt install  python3-venv
python3 -m venv env

Next we need to activate this virtual environment in our shell session in order to use it, we do this with the following command:
. env/bin/activate

After activating our environment we need to install the required python dependencies with the following command:
pip install -r requirements.txt

Now we are ready to run the examples, first we will create a new user account in our Hub:
python examples/create_user.py

It should output New user with id 'user-1' created! if your Hub is working correctly. Next up let's generate a new receiving address for this user:
python examples/get_address.py

This should output a new deposit address for user-1, feel free to send it a couple of IOTA to try it out using Trinity!
The last example we'll cover is getting the balance and history for a Hub user:
python examples/balance.py

This outputs something along these lines if you sent 10i to it (it may take a couple of minutes for the balance to show up):
10i available for test 'user-1'
events {
  timestamp: 1540856214000
  type: DEPOSIT
  amount: 10

If you look at the deposit address history in a tangle explorer like thetangle.org you will see the Hub moved the funds away from the deposit address towards a hot wallet, this is done in a so called 'sweep' executed by the Hub.
Have a look at the examples to see how you are able to interact with the Hub through gRPC. These examples are in Python but every major programming language seems to have a gRPC library available to easily interact with external services like these.