This repository contains several tools Project Zero uses to test iPhone messaging. It includes SmsSimulator: an SMS simulator for iPhone, iMessage: tools for sending and dumping iMessage messages, and imapiness: a fuzzer for IMAP clients. See the directory for each tool for further instructions and contact information. This is not an officially supported Google product. These tools were released and presented at BlackHat USA 2019.
You can download it from the following link: https://packetstormsecurity.com/files/download/153976/iOS-messaging-tools-master.zip
Source: https://packetstormsecurity.com/files/153976/iOS-Messaging-Tools.html