Here are some best practices to create a test automation solution on mobile app in IoT:

1. Create an automation plan
2. Identify test cases that can be automated
3. Develop test cases
4. Test early and frequently
5. Choose appropriate automated testing software and tool
6. Segregate your automated testing skills and efforts
7. Create test data
8. Use a cloud-based platform
9. Use a tool that supports data-driven testing
10. Track test results and identify issues

By following these best practices, you can create a test automation solution that will help you to ensure the quality of your IoT mobile app. Here are some blogs that might help to clear your concept more efficiently:

https://www.headspin.io/blog/what-is-test-automation-a-comprehensive-guide-on-automated-testing
https://www.headspin.io/blog/a-guide-on-how-to-maintain-automation-test-scripts