Box of Secrets: Discreetly modding an apartment intercom with Matter

The author and friends discovered their apartment complex's intercom system was non-functional due to lapsed cellular service. They explored the unlocked control box, found an AT&T router with default credentials and a downloadable configuration file exposing root password hashes, but ultimately pivoted away from the router exploit due to the complexity of its custom serial protocol. They then investigated the phone line connectors and DTMF signaling as an alternative approach to controlling the gate.