ESP8266 RTOS SDK firmware development

ESP8266 RTOS SDK firmware development for MQTT communication on NodeMCU with specific design requirements.

Functionality:
- MQTT communication
- WiFi connectivity
- Sensor data collection

Ideal skills and experience:
- Experience with ESP8266 RTOS SDK
- MQTT protocol expertise
- WiFi connectivity knowledge
- Sensor data collection experience
- Experience with NodeMCU

Design requirements:
- Specific design requirements provided by the client.