This slides cover local connectivity using nRF24L01+ and sample integration for connecting local sensors/actuators to Blynk cloud.

Introduction to NodeMCU, an IoT Development Board based on ESP8266 SoC. This covers accessing NodeMCU with Blynk App and connecting NodeMCU to Firebase.

ESP8266 is a low-cost, low-power, highly-integrated Wi-Fi solution from Espressif Systems. ESP8266EX integrates a 32-bit microcontroller unit (MCU), which features extra-low power consumption. ESP8266EX provides enough processing power for applications while maintaining the Real Time Operation System (RTOS) and a functional Wi-Fi (TCP/IP) stack.