This is likely to be shut down, as it's definitely too broad of a question.
Having said that, in broad terms...if you want to use Google Cloud to do this: Check out Google Cloud IoT Core for getting the sensor data into Google Cloud, which will put it into a Pub/Sub topic. Then from there you can ingest it into a Firebase/Firestore database (using something like a Cloud Function, or an App Engine polling application) which can then serve up the data in real time to your applications. Mobile apps can "subscribe" to data changes in the Firebase database, which allows them to easily read things in real time.
I basically did this for a talk I did at Google Next a few years ago, the code is in this repo:
https://github.com/GabeWeiss/GoogleIoTCoreApp
Device code is for a Raspberry Pi, but if you're comfy with sensors, that part is easy.
gcf are Google Cloud Functions that shuttled the sensor data from Pub/Sub into Firestore.
angular is the front-end web app that we wrote real quick (it's super basic) to display the results in real time.
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