Ethernet to 32 Channel TTL Digital I/O Adapter - Sealevel
Nextion IO Adapter | ITEAD STUDIO OFFICIAL
Pistorm32 CM4-Adapter Board + IO-Board + Cable from RetroFletch on Tindie
Amazon.com: USB C to Lightning Adapter 2 Pack, iO-S OTG Adapter, Suitable for Connecting Phones, Tablets, USB Flash Drives, Card Readers, mice, and Keyboards : Electronics