I ran across the PINE64 site today, and was surprised to see what look like additional i2c "brick" modules available. I don't know that they are compatible with the Udoo specifications, but if so, it would be good to have a source for brick interconnection cables. Price: $1.25 For IOT developers, there is the PADI IOT STAMP $1.99 PADI IoT Stamp is a highly integrated, single-chip, low power WiFi controller with built-in antenna. The stamp combines an ARM Cortex M3, integrated Flash and RAM, WLAN MAC, WLAN baseband, RF balun, PA, LNA receiver, saw filter and power management module. Designs for makers with high speed SPI/I2C/UART interfaces for IoT applications with minimum Printed Circuit Board (PCB) area requirement. The PADI IoT Stamp is even smaller than a US stamp size.