Please check out this comprehensive guide from OKdo on how to set up your own low power IoT platform based on WiFi with awesome dashboard visualisations from sensors using Grafana. The guide is very easy to follow and can be realised by anyone with some basic IT skills.
Components used in this project:
Raspberry Pi board
2 or more AA, AAA batteries
Please check it out: https://www.okdo.com/project/monitor-cricket-modules-in-grafana/
Things On Edge is a company based in Cambridge, UK. They design easy to use, ultra-low power Cricket Wi-Fi modules. They enable makers at all skill levels to build battery powered WiF devices and integrate them to a huge IOT ecosystems of software and internet services over MQTT and HTTP apis. All this without writing a single line of code and programming.