mkdir test
cd test
mkdir functions
cd functions
vi package.json

{"name":"mytest","description":"mytest","dependencies":{"firebase-admin":"~7.1.1","firebase-functions":"^2.2.1"},"devDependencies":{"chai":"^3.5.0","chai-as-promised":"^6.0.0","firebase-functions-test":"0.1.6","mocha":"^5.0.5","sinon":"^4.1.3"},"scripts":{"ci-test":"npm install && npm run test","serve":"firebase serve --only functions","shell":"firebase experimental:functions:shell","start":"npm run shell","deploy":"firebase deploy --only functions","logs":"firebase functions:log"},"engines":{"node":"8"},"private":true}

vi index.js

'use strict';constfunctions=require('firebase-functions');constadmin=require('firebase-admin');admin.initializeApp();exports.send_data=functions.https.onRequest(async(req,res)=>{consttime=req.query.time;consttext=req.query.temp;constsnapshot=awaitadmin.database().ref('/test').push({time:time,text:text});res.redirect(303,snapshot.ref.toString());});exports.read_data=functions.https.onRequest((req,res)=>{varref=admin.database().ref("test");returnref.orderByChild("time").limitToLast(10).once('value').then(function(snapshot){res.send(snapshot.val());});});

cd functions && npm install&&cd ..
firebase deploy