Hello everyone, I researched the nodes that exchange data in bacnet and tried the nodes in the node-red library but I didn't find them very successful. Which one do you use? Can you give me an example?
Can you elaborate on „not very successful“
We had same experience, all the available node red packages were unsuccessful. One of them looked promosing, but was unable to write some values (was it binary? don't remember). So we threw them all in the bin and used bacnet stack from instead. It is a program to run from cli, in our case linux. We could then run the command from exec node in node red. Unfortunately, this tool was not perfect either, but at least it mostly worked. The problem we found was that it could easily mix the responses when sending multiple queries, which is a critical problem of course. Solution was to schedule in node red so that it only sends one request at a time. Here is how the subflow looks like:
The source of the subflow is unfortunately too large to share here on forum. However here are the most of the nodes except the log subflow node:
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"timeout": 0,
"noerr": 0,
"initialize": "",
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"libs": [],
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"func": "const errors = [];\nif(msg.method == \"read\"){\n if(msg?.payload?.length === 0 || msg?.payload === \"\"){\n // empty payload is only error for read\n errors.push(\"Empty payload.\");\n }\n}\n\nif(msg?.rc?.code !== 0){\n errors.push(`Return code: ${msg?.rc?.code}.`);\n}\nif (msg?.rc?.message){\n errors.push(msg.rc.message);\n}\nif(errors.length > 0 && msg?.payload){\n errors.push(msg.payload);\n}\n\nif(errors.length > 0){\n throw new Error(errors.join(\" \"));\n}\n\n// remove temporary bacnet config and retry junk\n// to avoid interference with other nodes or retry nodes downstream (after calling this subflow)\ndelete msg.method;\ndelete msg.attempt;\ndelete msg.maxAttempts;\ndelete msg.delay;\ndelete msg.logWarning;\ndelete msg.logError;\ndelete msg.logMessage;\ndelete msg._backup;\ndelete msg.rc;\ndelete msg.rate;\ndelete msg.timeout;\n\nreturn msg;",
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{
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"type": "bool",
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"ui": {
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"g": "cf2095c134878bdc",
"name": "retry?",
"func": "function cleanUpLog(){\n if(msg.logMessage){\n msg.logMessage = msg.logMessage.replaceAll(\"\\n\", \" \"); // remove new lines\n msg.logMessage = msg.logMessage.replace(/\\s+/g, \" \"); // reduce multiple spaces to one space\n }\n}\n\nif (msg.attempt >= msg.maxAttempts) {\n msg.logMessage = \"\";\n if(msg.logError){\n if (msg.maxAttempts > 1) {\n msg.logMessage = `ERROR: Bacnet failed ${msg.method} ${msg?.topic} (${msg?.error?.message}) after ${msg.maxAttempts} attempts.`;\n } else {\n msg.logMessage = `ERROR: Bacnet failed ${msg.method} ${msg?.topic} (${msg?.error?.message}).`;\n }\n if(msg?.rc?.signal == \"SIGTERM\"){\n msg.logMessage += ` Command timeout after ${msg.timeout} seconds (SIGTERM).`;\n }\n cleanUpLog();\n }\n return [null, msg];\n}\nconst attempt = msg.attempt;\n\nlet error = msg?.error?.message;\nif(error && \"error: \".toLowerCase().startsWith(\"error: \")){\n error = error.replace(/^error: /, \"\").trim();\n}\n\nlet logMessage = \"\";\nif(msg.logWarning){\n logMessage = `WARNING: Bacnet failed ${msg.method} ${msg.topic} (${error}), attempt nr ${msg.attempt}.`;\n if(msg?.rc?.signal == \"SIGTERM\"){\n logMessage += ` Command timeout after ${msg.timeout} seconds (SIGTERM).`;\n }\n logMessage += ` Trying again in ${msg.delay / 1000} seconds.`;\n}\n\n\nlogMessage += ``;\nmsg = msg._backup; // revert to original message\nmsg._backup = RED.util.cloneMessage(msg); // reapply backup\n\nmsg.logMessage = logMessage;\ncleanUpLog();\nmsg.attempt = attempt +1;\n\nreturn [msg, null];",
"outputs": 2,
"timeout": 0,
"noerr": 0,
"initialize": "",
"finalize": "",
"libs": [],
"x": 490,
"y": 500,
"wires": [
[
"54bdb9ac16624e82"
],
[
"058214040a1bf485"
]
],
"outputLabels": [
"Retry",
"No retry"
]
},
{
"id": "54bdb9ac16624e82",
"type": "subflow:a5184c5aab2f6cda",
"z": "6968fb5a019df2d0",
"g": "cf2095c134878bdc",
"name": "Log Warning (retry)",
"x": 670,
"y": 480,
"wires": [
[
"3d89135e65b83091"
]
]
},
{
"id": "3d89135e65b83091",
"type": "delay",
"z": "6968fb5a019df2d0",
"g": "cf2095c134878bdc",
"name": "",
"pauseType": "delayv",
"timeout": "1",
"timeoutUnits": "seconds",
"rate": "1",
"nbRateUnits": "1",
"rateUnits": "second",
"randomFirst": "1",
"randomLast": "5",
"randomUnits": "seconds",
"drop": false,
"allowrate": false,
"outputs": 1,
"x": 840,
"y": 480,
"wires": [
[
"5e2724bdc601025d"
]
]
}
]
And here is the external bacnet program:
