sol | Lightweight MQTT broker , written from scratch | Performance Testing library

The initial condition needs to be complex:

Had this issue myself, apparently it's some sort of Ganache CLI error but the simplest fix I could find was to change the network id in Ganache through settings>server to 1337. It restarts the session so you'd then need to change the address and private key variable.

If it's the same tutorial I'm doing, you're likely to come unstuck after this... the code for transaction should be:

That error is clear. you do not have sufficient funds. This is how you are getting the account information:

to test locally you need to make use of mocks which can simulate having an oracle network. Because you're working locally, a Chainlink node doesn't know about your local blockchain, so you can't actually do proper VRF requests. Note you can try deploy a local Chainlink node and a local blockchain and have them talk, but it isn't fully supported yet so you may get mixed results. Anyway, as per the hardhat starter kit that you linked, you can set the defaultNetwork to be 'hardhat' in the hardhat.config.js file, then when you deploy and run the integration tests (yarn test-integration), it will use mocks to mock up the VRF node, and to test the requesting of a random number. See the test here, and the mock contracts and linktoken get deployed here

Deploying a contract and interacting with the contract are two different things.

After you deployed the contract on a blockchain, then you need a provider which is kinda a bridge to a node in that blockchain.

Yes! The SOL you used for rent is still stored in the account, even if the deployment failed.

After your deployment fails, you'll get an error like this:

After a long search through the internet, I have finally found a way of solving my problem that I want to share with you.

I solved this issue by having a payable fallback function by defining it as:

This is fixed in Brownie v1.18.1. However, you will need to install Python 3.9.10 in order to get the latest brownie. For this to work in a virtual environment you can't use venv. Here is a process that works for me:

• install virtualenv on your standard Python version
• download python 3.9.10 and install it without "add to path" into a dedicated directory e.g. $home/pythonversions
• in your project directory create a virtual environment like so

python -m virtualenv -p=""

• start your virtual environment e.g. home>..venv\Scripts\activate.ps1

• test if your python version is the desired one with python --version

• Now install Cython to avoid another error.

• Install nodeenv in order to install ganage

• Activate with nodeenv -p (for this step you will need PowerShell with admin rights)

• Install ganache with npm

• Install eth-brownie with pip check if you got the latest version with

brownie --version