Hot skills in Embedded and IoT

Based on my observation in the job market, the following skills are currently in demand in embedded systems surrounding IoT development:

1. 802.11 (WiFi)
2. Bluetooth, especially Bluetooth 4.0 + Low Energy (BLE) or newer
3. Zigbee (IEEE 802.15.4)
4. Z-Wave: Based on ITU G.9959 (PHY) and Z-Wave Application layer
5. Bonjour (mDNS/DNS-SD)
6. SSDP (Simple Service Discovery Protocol)
7. OCF (Open Connectivity Foundation's uPnP Device Control Protocol)
8. TCP/UDP
9. TLS (Transport Layer Security)
10. CoAP (Constrained Application Protocol; RFC-7252)
11. HTTP, especially RESt API
12. MQTT (Mosquitto)
13. MultiThread
14. Websockets
15. RESTful (Representational State Transfer) architecture
16. Rust (Rust is a programming language that’s focused on safety, speed, and concurrency)
17. Jenkins
18. XML
19. LWM2M
20. SQS
21. AMQP
22. Kafka
23. AWS (Amazon Web Service)
24. Microsoft Azure
25. I²C
26. SPI
27. Asynchronous serial/UART programming
28. Linux Kernel and Driver development
29.