A list of hacking/security resources that are focused on IoT
OWASP IoTGoat - https://github.com/OWASP/IoTGoat/
Attify OS - https://www.attify.com/attifyos
Attify Badge - https://www.attify-store.com/products/attify-badge-uart-jtag-spi-i2c
Firmware Analysis Toolkit - https://github.com/attify/firmware-analysis-toolkit
Firmware Mod Kit - https://github.com/rampageX/firmware-mod-kit
DarkerEgo Pre-compiled MIPS Binaries - https://github.com/darkerego/mips-binaries
Joe Grand (YouTube, Master Hardware Hacker!) - https://www.youtube.com/@JoeGrand
JTAGUlator (Joe Grand's awesome hardware hacking tool) - https://www.parallax.com/product/jtagulator/
Bus Pirate - https://www.sparkfun.com/products/12942
Binwalk - Comes with Kali, AttifyOS, Parrot, or you can install them at least
Firmwalker - https://github.com/craigz28/firmwalker
Tigard - https://www.crowdsupply.com/securinghw/tigard