修改 RFID Homie Scanner
源自於 RFID Scanner – WeMos, RC522, Homie MQTT & Node-RED
https://learn.linksprite.com/rfid/rfid-scanner-wemos-rc522-homie-mqtt-node-red/
源自於 https://flows.nodered.org/flow/92b43bcf393589364f85fa3033d78e4e
Node-RED程式
http://www.mediafire.com/file/fzxy62vxcwmspzj/IOL_City_RFID_flows_%25281%2529.json/file
Node-RED程式
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The RFID tags are compared against \nseveral workflow options, such as disco, train,etc.\n\nA grant/deny message is sent back to the RFID\nscanner, using the Homie convention. \nhttps://github.com/marvinroger/homie\n\nComplete write-up on the IoL blog:\nwww.InterentOfLEGO.com\n\nwritten by \nCory Guynn\n2016","x":270,"y":40,"wires":[]},{"id":"b0e33b4c.83f398","type":"comment","z":"ec596068.55c12","name":"README","info":"#RFID SCANNER\n\n* This flow listens to an RFID scanner via MQTT.\n\n* A switch node then assigns a workflow based on\nthe 'uid' received.\n\n* An authorization message is sent back to the device \nby setting the 'validate' property.\n\n##Device Info \n* WeMos d1-mini (ESP8266 dev board)\nhttp://www.wemos.cc/Products/d1_mini.html\n\n* RFID RC522\nhttp://playground.arduino.cc/Learning/MFRC522\n\n* Homie MQTT framework\nhttps://github.com/marvinroger/homie/tree/master\n\n\n\n\n## Written by Cory Guynn, 2016\nwww.InternetOfLEGO.com\n\n\n\n","x":100,"y":40,"wires":[]},{"id":"31b1dd74.58ae22","type":"comment","z":"ec596068.55c12","name":"Workflows","info":"","x":260,"y":200,"wires":[]},{"id":"fc6060fa.692c6","type":"comment","z":"ec596068.55c12","name":"Disco Cinema","info":"","x":370,"y":260,"wires":[]},{"id":"9d6336a1.c878b8","type":"comment","z":"ec596068.55c12","name":"Train Routine","info":"","x":410,"y":400,"wires":[]},{"id":"75194cd.9e92cb4","type":"comment","z":"ec596068.55c12","name":"MQTT Monitor","info":"","x":170,"y":540,"wires":[]},{"id":"272d9f7b.17b27","type":"ui_toast","z":"ec596068.55c12","position":"dialog","displayTime":"","highlight":"","sendall":true,"outputs":1,"ok":"OK","cancel":"Cancel","raw":false,"topic":"確認","name":"RFID","x":950,"y":120,"wires":[[]]},{"id":"23ccca08.3dd636","type":"link out","z":"ec596068.55c12","name":"UID Granted","links":["425a6e8e.3418a","d9391786.7a6b58","7a52bfa0.58d78","409fd8ad.03b418"],"x":855,"y":80,"wires":[]},{"id":"425a6e8e.3418a","type":"link in","z":"ec596068.55c12","name":"","links":["23ccca08.3dd636"],"x":315,"y":300,"wires":[["e68f553e.645fb8"]]},{"id":"9feee5fd.50f468","type":"ui_template","z":"ec596068.55c12","group":"66a6f9e9.2ef518","name":"RFID-1 Log","order":2,"width":"6","height":"7","format":"<h1>Event Log</h1>\n<div>\n<ul>\n <li ng-repeat=\"x in msg.payload\">\n <font color=\"red\">{{x.topic}}</font>\n <ul>\n <li>{{x.payload}}</li>\n </ul>\n </li>\n</ul>\n</div>","storeOutMessages":true,"fwdInMessages":true,"x":710,"y":620,"wires":[[]]},{"id":"d724d215.494a6","type":"function","z":"ec596068.55c12","name":"Store and shift msg","func":"\n\n\n// initialise the counter to 0 if it doesn't exist already\nvar text = context.get('text')|| [];\n\ntext.push(msg);\nif (text.length > 5){\n text.shift();\n text.length = 5;\n} \n\n// store the value back\ncontext.set('text',text);\n// make it part of the outgoing msg object\nmsg = {};\nmsg.payload = text;\nreturn msg;\n","outputs":1,"noerr":0,"initialize":"","finalize":"","x":470,"y":620,"wires":[["9feee5fd.50f468","8d16a18c.2c4dc"]]},{"id":"8d16a18c.2c4dc","type":"debug","z":"ec596068.55c12","name":"RFID-1 log","active":true,"console":"false","complete":"payload","x":710,"y":660,"wires":[]},{"id":"5b4d6603.a323d8","type":"delay","z":"ec596068.55c12","name":"","pauseType":"rate","timeout":"5","timeoutUnits":"seconds","rate":"1","nbRateUnits":"","rateUnits":"second","randomFirst":"1","randomLast":"5","randomUnits":"seconds","drop":true,"x":270,"y":160,"wires":[["5d424b72.1ced34"]]},{"id":"ed45a676.4ecfd8","type":"function","z":"ec596068.55c12","name":"store Homie state","func":"\n\n\n// initialise the state to empty object if it doesn't exist already\nvar state = context.get('state')|| {};\n\n// regular expression to look for Homie updates\nvar t;\nvar re = /([^/]+$)/i;\nt = re.exec(msg.topic);\nvar prop = t[0];\n\n// remove preceding $\nif (prop.substring(0, 1) == '$') { \n prop = prop.substring(1);\n}\n\n// Store state\nstate[prop] = msg.payload;\ncontext.set('state',state);\n\n// send state object\nmsg.payload = state;\nreturn msg;\n","outputs":1,"noerr":0,"initialize":"","finalize":"","x":470,"y":720,"wires":[["3e68cf11.823fe","eebc787b.343488"]]},{"id":"3e68cf11.823fe","type":"debug","z":"ec596068.55c12","name":"RFID-1 State","active":true,"console":"false","complete":"payload","x":690,"y":720,"wires":[]},{"id":"eebc787b.343488","type":"ui_template","z":"ec596068.55c12","group":"66a6f9e9.2ef518","name":"RFID-1 State","order":1,"width":"6","height":"6","format":"<h1>{{msg.payload.name}}</h1>\n<p ng-style=\"{color: msg.payload.online === 'true' ? 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