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181201_CoAP_coding365
- 1. CoAP 與 LwM2M應用實作 易弼仁
- 2. 目標 1 ATMega32u4 UART MT7688 節點開發環境準備1 LwM2M Client (coap-node) LwM2MServer (coap-shepherd) register() ind readReq() writeReq() 組織機器網路與操作遠端節點3 LwM2M Client (coap-node) SmartObject 設計機器節點2 LwM2M Server Client 確認 Linkit 7688 Duo 中已有程式碼與 fermata、smartobject 和 coap-node模組
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- 5. 應用層統一資料模型 4 訊息／數據 的意義是什麼？ 屬性 命令 行為 Physical DataLink Network Transport > 230 models 2016 (OIC@2014) 51 models 2008 5 Schemas 2015
- 6. 智慧物件 Smart Object 5 Object oid= 3303 rid = 5700 Resources rid = 5701 rid = 5605 Temperature Sensor Boilerplate Create instance with an iid Temperature Sensor Entity #1 oid = 3303 rid = 5700 rid = 5701 rid = 5605 iid = 1 Object Instance value value value oid = 3303 rid = 5700 rid = 5701 rid = 5605 iid = 0 Object Instance value value value Temperature Sensor Entity #0 IPSO Alliance & IPSO Model └ 對真實世界的物件資料模型進行標準化 └ 已定義 51 種 Smart Objects，增加中 └ 採用階層化資料模型 └ Object, Object Instance, Resource
- 7. 請花幾分鐘閱讀 6 溫度感測器的模型 └ https://github.com/AllSmartObjects/smartobject/blob/master/docs/templates.md#tmpl_temperature 電燈的模型 └ https://github.com/AllSmartObjects/smartobject/blob/master/docs/templates.md#tmpl_lightCtrl SmartObject模組使用入門 └ Overview: https://github.com/AllSmartObjects/smartobject#1-overview └ Usage: https://github.com/AllSmartObjects/smartobject#3-usage SmartObject 的存取介面 └ Read: https://github.com/AllSmartObjects/smartobject#API_read └ Write: https://github.com/AllSmartObjects/smartobject#API_write 1 mins 1 mins 6 mins 5 mins
- 8. smartobject 模組 7 APIs 說明 new SmartObject() 建立 SmartObject 實例 .init() 建立並初始化一個物件實例 (Object Instance) .read() 讀取 SmartObject 實例中資源的值 .write() 寫入 SmartObject 實例中資源的值 .dump() 讀取 SmartObject 實例中所有資源的值 smartobject 模組重要 APIs 說明
- 9. 初始化你的智慧物件專案 8 開一個專案資料夾 進入資料夾 npm init 初始化專案 安裝所需的第三方模組 $mkdir smart-iot-app $ cd smart-iot-app $ npm init $ npm install smartobject --save 啟動新專案的制式步驟 Smart Object 專案 /smart-iot-app /node_modules /lib - rboard.js - vboard.js - smart-obj.js - package.json - index.js (前面已經做好)
- 10. 製作 Smart Object 9 varrboard = require('./rboard'), vboard = require('./vboard'), SmartObject = require('smartobject'); var so = new SmartObject({ arduino: rboard.arduino }); so.init('temperature', 0, { // < rid = 5700, R, Float > sensorValue: { read: function (cb) { return vboard.fooBus.read(cb); } }, // < rid = 5701, R, String > units: 'C' }); so.init('lightCtrl', 0, { // < rid = 5850, RW, Boolean { 0: off, 1: on } > onOff: { read: function (cb) { return rboard.gpio.read(13, cb); }, write: function (value, cb) { return rboard.gpio.write(13, value, cb); } } }); module.exports = so; 6 mins/lib/smart-obj.js 請在專案資料夾底下開新檔 /lib/smart-obj.js
- 11. index.js 10 var mySo =require('./lib/smart-obj'); mySo.hal.arduino.on('ready', function () { console.log('rboard ready!'); // toggle the LED setInterval(function () { mySo.read('lightCtrl', 0, 'onOff', function (err, onOff) { mySo.write('lightCtrl', 0, 'onOff', onOff ? 0 : 1, function (err, status) { console.log('LED Status: ' + (status ? 'ON' : 'OFF')); }); }); }, 2000); // poll the sensor setInterval(function () { mySo.read('temperature', 0, 'sensorValue', function (err, value) { console.log('Sensor value: ' + value + ' C'); }); }, 3000); }); 6 minsindex.js # node index.js // 觀察結果是否與上個應用相同 應用程式的進入點 (其他常見的進入點名稱還有 main.js 或 app.js)
- 12. 當溫度超過 25 度就亮燈 11 varmySo = require('./lib/smart-obj'); // poll the sensor mySo.hal.arduino.on('ready', function () { console.log('rboard ready!'); setInterval(function () { mySo.read('temperature', 0, 'sensorValue', function (err, value) { console.log('Sensor value: ' + value + ' C'); if (value > 25) { mySo.write('lightCtrl', 0, 'onOff', 1, function (err, status) { console.log('Temp > 25 C, LED ON'); }); } else { mySo.write('lightCtrl', 0, 'onOff', 0, function (err, status) { console.log('Temp <= 25 C, LED OFF'); }); } }); }, 3000); }); 3 minsindex.js # node index.js
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- 14. CoAP 13 特性 └ The ConstrainedApplication Protocol └ 封包 overhead 較輕，標頭僅有 4 bytes └ 專為 M2M 應用打造 └ 使用 coap:// 協定，易於和 HTTP 結合 └ 基於 UDP └ 支援 GET, POST, PUT, DELETE 請求方法 └ 支援 URI、加解密與認證、discovery 功能 Proxy HTTP HTTP CoAP CoAP Internet Constrained Environment REST Constrained Link IP UDP CoAP Web Resources CoAP Stack 為資源受限的裝置所量身訂製的 RESTful 協定
- 15. Web 世界的資源命名 14 Universal ResourceLocator (URL) http:// www.example.com :8080 /sensors ?id=light PortScheme Authority Path Query Resource HTTP TCP IP Ethernet Link DNS 2001:dead:beef::1
- 16. Web 世界的資源命名 15 Universal ResourceLocator (URL) coap:// www.example.com :5683 /sensors ?id=light PortScheme Authority Path Query Web Resources CoAP UDP IP Constrained Link DNS 2001:dead:beef::1
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- 18. LwM2M 17 輕量型機器對機器協定：統一管理介面 Machine ServerBootstrap Server MachineNetwork Management Layer (REST Interface) register deregister update read write write attrs execute create delete observe bootstrap notify end-nodes
- 19. LWM2M URLs 18 是不是覺得很眼熟呢? /{object}/{instance}/{resource} /3303/0/5700 (=/temperature/0/sensorValue) http://www.example.com/myhouse/{object}/{instance}/{resource} http://www.example.com/myhouse/3303/0/5700 http://www.example.com/myhouse/temperature/0/sensorValue
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- 22. 應用架構 21 ATMega32u4 UART MT7688 節點開發環境準備1 LwM2M Client (coap-node) LwM2MServer (coap-shepherd) register() ind readReq() writeReq() 組織機器網路與操作遠端節點3 LwM2M Client (coap-node) SmartObject 設計機器節點2 LwM2M Server Client
- 23. 機器網路架構 • 22 CoAP Machine Nodes CoAPMachine Server Temperature Sensor Light Control REST, CoAP, WS, TCP/IP, … Device Tier (Edge Nodes) Gateway Tier User Tier Cloud Tier HTTP Server (Proxy) REST, MQTT, WS, TCP/IP, …
- 24. CoAP Machine Server：Leshan 23 借用CaAP Machine Server JAVA 的實作來測試：Leshan Server Demo 待會 CoAP 要註冊的位址： leshan.eclipse.org
- 25. 節點專案看起來的樣子 24 CoAP 機器節點 /coap-devices /node_modules /lib - rboard.js -vboard.js - package.json - cnode1.js - cnode2.js (前面已經做好)
- 26. coap-node 模組 25 APIs 說明 new cnode(deviceName, smartobject) 建立一個 Cnode 實例 .register(address, port, callback) 發送註冊請求給 server .deregister(callback) 發送取消註冊請求給 server Events 說 明 'registered’ registered 事件監聽器，接收 Cnode 註冊完成通知 coap-node 模組重要 APIs 說明
- 27. 準備 CoAP MachineNodes 26 我們有一個溫度感測器跟一顆 LED 燈，這裡先做溫度感測器的節點 cnode1.js var vboard = require('./lib/vboard') CoapNode = require('coap-node'), SmartObject = require('smartobject'); var cnode1, soTemp = new SmartObject({ arduino: vboard.arduino }); soTemp.init('temperature', 0, { sensorValue: { read: function (cb) { return vboard.fooBus.read(cb); } }, units: 'C' }); cnode1 = new CoapNode('my_client_id_cnode001', soTemp); cnode1.on('registered', function () { console.log('registered'); }); cnode1.register('leshan.eclipse.org', 5683, function (err, msg) { if (err) { console.log(err); } else { if (msg.status !== '2.01') { setTimeout(startRegister, 5000); } } }); module.exports = cnode1; cnode1.js Ref: https://github.com/PeterEB/coap-node/wiki#4-usage
- 28. 讓節點加入網路 27 設定 7688 為Station Mode，連上網際網路 執行 $ node cnode1.js，並測試看看是否讀到溫度值
- 29. 製作另一個節點：cnode2.js(I) 28 var rboard =require('./lib/rboard'), CoapNode = require('coap-node'), SmartObject = require('smartobject'); var cnode2, soLight = new SmartObject({ arduino: rboard.arduino, ledPinNum: 13 }); soLight.init('lightCtrl', 0, { onOff: { read: function (cb) { var hal = this.parent.hal; return rboard.gpio.read(hal.ledPinNum, cb); }, write: function (value, cb) { var hal = this.parent.hal; return rboard.gpio.write(hal.ledPinNum, value, cb); } } }); cnode2.js
- 30. 製作另一個節點：cnode2.js(II) 29 cnode2 = newCoapNode('my_client_id_cnode002', soLight); cnode2.on('registered', function () { console.log('registered'); }); soLight.hal.arduino.on('ready', function () { console.log('rboard ready!'); cnode2.register('leshan.eclipse.org', 5683, function (err, msg) { if (err) { console.log(err); } else { if (msg.status !== '2.01') { setTimeout(startRegister, 5000); } } }); }); module.exports = cnode2; cnode2.js Ref: https://github.com/PeterEB/coap-node/wiki#4-usage
- 31. 讓節點加入網路 30 執行 $ nodecnode2.js，測試看看除了讀取到 LED 狀態外，還可以做什麼…
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- 33. 機器網路架構 • 32 CoAP Machine Nodes CoAPMachine Server Temperature Sensor Light Control REST, CoAP, WS, TCP/IP, … Device Tier (Edge Nodes) Gateway Tier User Tier Cloud Tier HTTP Server (Proxy) REST, MQTT, WS, TCP/IP, …
- 34. 33 ATMega32u4 UART MT7688 節點開發環境準備1 LwM2M Client (coap-node) LwM2MServer (coap-shepherd) register() ind readReq() writeReq() 組織機器網路與操作遠端節點3 LwM2M Client (coap-node) SmartObject 設計機器節點2 LwM2M Server Client
- 35. 節點專案看起來的樣子 34 CoAP 機器節點 /coap-server /node_modules - package.json -app.js $ npm install coap-shepherd 於電腦終端機執行指令 $ npm install coap-shepherd 安裝模組
- 36. 35 Server APIs 說明 new CShepherd() 建立 CShep 實例 .start() 啟動 coap-shepherd，啟動完成後發射 ready 事件 .permitJoin() 允許或禁止周邊 client 裝置加入網路 .find() 搜尋已入網之 client device 實例，可對其進行讀寫操作 Server Events 說 明 'ready' ready 事件監聽器，接收 CShep 啟動完成通知 'ind' ind 事件監聽器，接收 client 相關事件通知 (如裝置入網、離網等) Client APIs 說 明 .readReq() 讀取遠端 client 裝置的資源 .writeReq() 將值寫入到遠端 client 裝置的資源中 .observeReq() 訂閱遠端 client 裝置的資源 coap-shepherd 模組重要 APIs 說明
- 37. 36 var cserver =require('coap-shepherd'); cserver.on('ready', function () { console.log('>> coap-shepherd server start!'); console.log('>> Permit devices joining for 180 seconds'); cserver.permitJoin(180); }); cserver.start(function (err) { if (err) console.log(err); }); app.js
- 38. 37 cserver.on('ind', function (msg){ switch (msg.type) { case 'devIncoming': devIncomingHandler(msg); break; case 'devStatus': devStatusHandler(msg); break; case 'devNotify': devNotifyHandler(msg); break; default: // Not deal with other msg.type in this example break; } }); app.js
- 39. 38 function devIncomingHandler(msg) { varcnode = msg.cnode; if (cnode.clientName === 'my_client_id_cnode001') { cnode.readReq('temperature/0/sensorValue', function (err, rsp) { if (!err) console.log('>> Current temperature value at machine: ' + rsp.data); }); } } app.js
- 40. 39 function devStatusHandler(msg) { varcnode = msg.cnode; if (cnode.clientName === 'my_client_id_cnode001' && msg.data === 'online') { // setting for notification of led state reporting cnode.observeReq('temperature/0/sensorValue', function (err, rsp) { console.log('>> Temperature observation starts: ' + rsp.status); }); } } app.js
- 41. 40 function devNotifyHandler(msg) { vardata = msg.data, node = cserver.find('my_first_node'); if (data && data.path === ‘/temperature/0/sensorValue') { console.log(‘>> Temperature value at machine changed: ' + data.value); } } app.js
- 42. 修改註冊 IP 位址 41 修改cnode1.js 中的 IP 位址為 coap-shepherd 所在電腦的 IP 位置 // ...略 cnode1.register('192.168.1.196', 5683, function (err, msg) { if (err) { console.log(err); } else { if (msg.status !== '2.01') { setTimeout(startRegister, 5000); } } }); module.exports = cnode1; cnode1.js $ ifconfig 於電腦終端機執行指令 $ ifconfig 取得 IP 位置
- 43. 執行測試 於電腦終端機執行指令 $ nodeapp.js， 於 Linkit 7688 Duo 執行指令$ node cnode1.js 觀察電腦終端機是否有印出溫度值。 42 $ node app.js $ node cnode1.js
- 44. 修改溫度值回傳時間 43 function devStatusHandler(msg) { varcnode = msg.cnode; if (cnode.clientName === 'my_client_id_cnode001' && msg.data === 'online') { // setting for notification of led state reporting cnode.writeAttrsReq('temperature/0/sensorValue', { pmax: 10 }, function (err, rsp) { console.log('>> Temperature writeAttrs starts: ' + rsp.status); cnode.observeReq('temperature/0/sensorValue', function (err, rsp) { console.log('>> Temperature observation starts: ' + rsp.status); }); }); } } app.js
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