There is a bewildering array of IOT gadgets from Arduino, ESP8266, ESP32, Huzzah/Feather, Lora Wan, Photon, Electron; Onion Omega, .... what I would really like is a set of cards like the circuit pattern set but for these devices with specs on the back. You could even include cards on protocols like OpenWRT, Lora, Mosquitto, MQTT, etc. I am sure they would sell. In fact, if you get the manufactures on board, they might subsidize the printing cost for advertising.