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Nodered Timeserver eui display

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This commit is contained in:
Verkehrsrot 2019-03-17 21:09:01 +01:00
parent 2a55e9a8c6
commit 9e4da009ca
1 changed files with 26 additions and 18 deletions
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44
src/TTN/Nodered-Timeserver.json
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@ -48,8 +48,8 @@
"from": "",
"to": "",
"reg": false,
"x": 220,
"y": 360,
"x": 200,
"y": 400,
"wires": [
[
"84f1cda2.069e7"
@ -82,7 +82,7 @@
"retain": "",
"broker": "2a15ab6f.ab2244",
"x": 690,
"y": 360,
"y": 400,
"wires": []
},
{
@ -135,11 +135,10 @@
"action": "",
"pretty": false,
"x": 540,
"y": 360,
"y": 400,
"wires": [
[
"72d5e7ee.d1eba8",
"f8749724.1ff9f8"
"72d5e7ee.d1eba8"
]
]
},
@ -166,7 +165,7 @@
"action": "",
"property": "payload.payload_raw",
"x": 380,
"y": 360,
"y": 400,
"wires": [
[
"dac8aafa.389298"
@ -213,30 +212,39 @@
"type": "function",
"z": "449c1517.e25f4c",
"name": "Generate Time Answer",
"func": "/* LoRaWAN Timeserver\n\nconstruct 6 byte timesync_answer from gateway timestamp and node's time_sync_req\n\nbyte meaning\n0 sequence number (taken from node's time_sync_req)\n1..4 current second (from epoch time 1970)\n5 1/250ths fractions of current second\n\n*/\n\nvar gateways = msg.payload.metadata.gateways;\nvar gateway_time = gateways.map(gw => new Date(gw.time));\nvar server_time = new Date(msg.payload.metadata.time);\n\ngateway_time.sort();\n\nvar gw_timestamps = gateway_time.filter(function (element) {\n return element > 0;\n});\n\nvar timestamp = gw_timestamps[0];\n\nif (timestamp < server_time) {\n\n var seconds = Math.floor(timestamp/1000);\n var fractions = (timestamp % 1000) / 4;\n var seqno = msg.payload.payload_raw[0];\n\n let buf = new ArrayBuffer(6);\n new DataView(buf).setUint8(0, seqno);\n new DataView(buf).setUint32(1, seconds);\n new DataView(buf).setUint8(5, fractions);\n\n msg.payload = new Buffer(new Uint8Array(buf));\n \n return msg;\n\n}\n\nelse\n\nreturn null;",
"outputs": 1,
"func": "/* LoRaWAN Timeserver\n\nconstruct 6 byte timesync_answer from gateway timestamp and node's time_sync_req\n\nbyte meaning\n0 sequence number (taken from node's time_sync_req)\n1..4 current second (from epoch time 1970)\n5 1/250ths fractions of current second\n\n*/\n\nfunction timecompare(a, b) {\n \n const timeA = a.time;\n const timeB = b.time;\n\n let comparison = 0;\n if (timeA > timeB) {\n comparison = 1;\n } else if (timeA < timeB) {\n comparison = -1;\n }\n return comparison;\n}\n\nlet confidence = 2000; // max millisecond diff gateway time to server time\n\nvar gateways = msg.payload.metadata.gateways;\nvar gateway_time = gateways.map(gw => {\n return {\n time: new Date(gw.time),\n eui: gw.gtw_id,\n }\n });\nvar server_time = new Date(msg.payload.metadata.time);\n\n// validate all gateway timestamps against lorawan server_time (which is assumed to be recent)\nvar gw_timestamps = gateway_time.filter(function (element) {\n return ((element.time > (server_time - confidence) && element.time <= server_time));\n});\n\n// if no timestamp left, we have no valid one and exit\nif (gw_timestamps.length === 0) return null;\n\n// sort time array in ascending order to find most recent timestamp for time answer\ngw_timestamps.sort(timecompare);\n\nvar timestamp = gw_timestamps[0].time;\nvar eui = gw_timestamps[0].eui;\n\nvar seconds = Math.floor(timestamp/1000);\nvar fractions = (timestamp % 1000) / 4;\nvar seqno = msg.payload.payload_raw[0];\n\nlet buf = new ArrayBuffer(6);\nnew DataView(buf).setUint8(0, seqno);\nnew DataView(buf).setUint32(1, seconds);\nnew DataView(buf).setUint8(5, fractions);\n\nmsg.payload = new Buffer(new Uint8Array(buf));\nvar infoMsg = { payload: eui };\n\nreturn [infoMsg, msg];",
"outputs": 2,
"noerr": 0,
"x": 420,
"y": 280,
"x": 380,
"y": 300,
"wires": [
[
"37722d4b.08e3c2",
"8712a5ac.ed18e8"
],
[
"49e3c067.e782e"
]
],
"outputLabels": [
"gw_eui",
"time_sync_ans"
]
},
{
"id": "f8749724.1ff9f8",
"id": "37722d4b.08e3c2",
"type": "debug",
"z": "449c1517.e25f4c",
"name": "time_sync_ans",
"active": false,
"tosidebar": true,
"name": "Timeserver Gw",
"active": true,
"tosidebar": false,
"console": false,
"tostatus": true,
"complete": "payload",
"x": 720,
"y": 280,
"wires": []
"x": 660,
"y": 260,
"wires": [],
"icon": "node-red/bridge.png"
},
{
"id": "2a15ab6f.ab2244",