README.md

Device Proof

This example mainly demonstrates how to make devices in the physical world communicate with w3bstream nodes.

First of all, there will be a trusted data source, which can be an esp32 single chip microcomputer or any device in the physical world. In this example, esp32 is used to send the data source, and then wasm applet will receive the data transmitted by the device. After analyzing the data, it will actively mint a W3BStream ERC20 token in the IoTeX testnet to the account you set up. Here are the notes in the code.

Send data

The payload you are about to send is a string in json format, and you can send data to w3bstream in any of the following ways

{
    "Device_id": "368ef287-40f9-4358-8221-00012235554",
    "Location_latitude": 10,
    "Location_longitude": -10,
    "Device_status": 1,
    "UL_throughput": 3770633,
    "DL_throughput": 1370858,
    "UL_utilization": 38,
    "DL_utilization": 14,
    "Connections": 395,
    "Device_alarms": 5,
    "Record_timestamp": 1655787124,
    "Data_source": "488",
    "Message": "",
    "Account":"YOUR ACCOUNT ADDRESS WITHOUT 0x"
  }

Please note that the data you want to send must contain Account and there is no 0x

curl

curl --location --request POST 'http://localhost:8888/srv-applet-mgr/v0/event/project_01' \
--header 'event_type: 2147483647' \
--header 'Content-Type: application/json' \
--data-raw '{
    "payload":"{\"Device_id\":\"368ef287-40f9-4358-8221-9e989efa9300\",\"Location_latitude\":10,\"Location_longitude\":-10,\"Device_status\":1,\"UL_throughput\":3770633,\"DL_throughput\":1370858,\"UL_utilization\":38,\"DL_utilization\":14,\"Connections\":395,\"Device_alarms\":5,\"Record_timestamp\":1655787124,\"Data_source\":\"488\",\"Message\":\"\",\"Account\":\"610CBDa6f0037B4141A5B949f56479106BeCb1E9\"}"
}'

javascript

var myHeaders = new Headers();
myHeaders.append("event_type", "2147483647");
myHeaders.append("Content-Type", "application/json");

var raw = JSON.stringify({
  "payload": "{\"Device_id\":\"368ef287-40f9-4358-8221-9e989efa9300\",\"Location_latitude\":10,\"Location_longitude\":-10,\"Device_status\":1,\"UL_throughput\":3770633,\"DL_throughput\":1370858,\"UL_utilization\":38,\"DL_utilization\":14,\"Connections\":395,\"Device_alarms\":5,\"Record_timestamp\":1655787124,\"Data_source\":\"488\",\"Message\":\"\",\"Account\":\"610CBDa6f0037B4141A5B949f56479106BeCb1E9\"}"
});

var requestOptions = {
  method: 'POST',
  headers: myHeaders,
  body: raw,
  redirect: 'follow'
};

fetch("http://localhost:8888/srv-applet-mgr/v0/event/project_01", requestOptions)
  .then(response => response.text())
  .then(result => console.log(result))
  .catch(error => console.log('error', error));

go

package main

import (
  "fmt"
  "strings"
  "net/http"
  "io/ioutil"
)

func main() {

  url := "http://localhost:8888/srv-applet-mgr/v0/event/project_01"
  method := "POST"

  payload := strings.NewReader(`{`+"
"+`
    "payload":"{\"Device_id\":\"368ef287-40f9-4358-8221-9e989efa9300\",\"Location_latitude\":10,\"Location_longitude\":-10,\"Device_status\":1,\"UL_throughput\":3770633,\"DL_throughput\":1370858,\"UL_utilization\":38,\"DL_utilization\":14,\"Connections\":395,\"Device_alarms\":5,\"Record_timestamp\":1655787124,\"Data_source\":\"488\",\"Message\":\"\",\"Account\":\"610CBDa6f0037B4141A5B949f56479106BeCb1E9\"}"`+"
"+`
}`)

  client := &http.Client {
  }
  req, err := http.NewRequest(method, url, payload)

  if err != nil {
    fmt.Println(err)
    return
  }
  req.Header.Add("event_type", "2147483647")
  req.Header.Add("Content-Type", "application/json")

  res, err := client.Do(req)
  if err != nil {
    fmt.Println(err)
    return
  }
  defer res.Body.Close()

  body, err := ioutil.ReadAll(res.Body)
  if err != nil {
    fmt.Println(err)
    return
  }
  fmt.Println(string(body))
}

Send data use esp32

You can refer this doc README.md

Receive data

After receiving the data, applet will output the following log to docker. Every time you send the data five times, your account will mint an erc20 token.

There is the erc20 token contract address 0xb73eE6EB5b1984c78CCcC49eA7Ad773E71d74F51

You can check it in spoon

Check token

If you want to see the change in the number of tokens more easily, you can go to web iopay to check it

First you can switch to IoTeX testnet,and enter the account which you want to observer.

And then enter the W3BStream Token address 0xb73eE6EB5b1984c78CCcC49eA7Ad773E71d74F51 to the search box

We found four tokens in our observer account.

🎉Congratulations, you have completed all the examples, and you can start using w3bstream happily.