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QUESTION
I am working on a Sparkplug B SCADA Host, and hoping to understand how the Sparkplug B SCADA Host keeps up-to-date with the Sparkplug B EoN Nodes and Devices that it is interested in. What I'm concerned with here is the metadata of EoN Nodes and Devices, as described by their NBIRTH and DBIRTH topics.
The scenario is:
Initially, an EoN Node has come online, and published its NBIRTH topic. The SCADA Host is offline, so it doesn’t see the NBIRTH.
The SCADA Host comes online. It has no knowledge of the the metrics on the EoN Node.
I haven't seen anything in the Sparkplug B specification that suggests how the SCADA Host can get the EoN Node to send its NBIRTH topic again. There is the Rebirth metric, which will request the BIRTH topic to be republished, but I am not sure that this is something that all implementations of Sparkplug B support.
It has been suggested to me that when the SCADA Host comes online it will publish a STATE topic to indicate that this has happened, and that the EoN Node will see this and Node publish its NBIRTH topic again. However, I don't see this behaviour mentioned in the Sparkplug B specification.
...ANSWER
Answered 2022-Feb-27 at 15:12The primary application (what you call SCADA host) sends a NCMD message to tell the EON to republish its NBIRTH and DBIRTH(s), as detailed at https://www.eclipse.org/tahu/spec/Sparkplug%20Topic%20Namespace%20and%20State%20ManagementV2.2-with%20appendix%20B%20format%20-%20Eclipse.pdf page 66 section 17.5 . More details may be hidden elsewhere in that spec. You can test all this with a client, eg. our free Sparkplug lab https://mqttlab.iotsim.io/sparkplug
QUESTION
Example of using ani-cli normally with no alias/automation
...ANSWER
Answered 2022-Jan-08 at 21:52The problem is that you're passing input to ani-cli via pipe, and when echo is done, the pipe closes, which closes ani-cli's standard input stream (stdin for short), which ani-cli detects as an error. Then there's no way to provide additional input.
Instead, pass the query as an argument (which the docs say you can do):
QUESTION
I am wondering, how to change fs.writeFileSync to fs.writeFile
ANSWER
Answered 2021-Feb-01 at 12:26You can use:
QUESTION
I want to make an economy bot that gives money every second to all users. All the stats of players are stored in a folder named DB, in a file "users.json". (./DB/users.json).
Here's an example object of a user's stats:
...ANSWER
Answered 2021-Jan-30 at 14:17var users = {
"(there is users id)": {
"bal": 28,
"lastclaim": 1612012406047,
"lastwork": 1612013463181,
"workers": 1,
"rebirths": 1
}
}
setInterval(function(){
users = Object.entries(users).reduce((init, [key, value] )=> ({...init, [key]: {...value, workers: value.workers + 1 }}),{})
console.log(users)
},1000)
QUESTION
I have a problem about implementing recommendation system by using Euclidean Distance.
What I want to do is to list some close games with respect to search criteria by game title and genre.
Here is my project link : Link
After calling function, it throws an error shown below. How can I fix it?
Here is the error
...ANSWER
Answered 2021-Jan-03 at 16:00The issue is that you are using euclidean distance for comparing strings. Consider using Levenshtein distance, or something similar, which is designed for strings. NLTK has a function called edit distance that can do this or you can implement it on your own.
QUESTION
This is a general error, but I'm unable to locate the problem and hence solution. I'm hosting a Minecraft server on my localhost (192.168.0.2) on port 25565. It can be accessed from the host by its internal IP (localhost and 192.168.0.2) but is unable to be accessed from the external IP (101.xxx.xx.xx).
Yes. I've restarted my host. Also the server says
[14:32:14] [Server thread/INFO] [net.minecraft.server.dedicated.DedicatedServer]: Starting Minecraft server on *:25565
so it must be true.
Port Forwarded?I can verify that the port is open to HTTP through a simple Node.JS server hosted on the device. This can be accessed on through 101.xxx.xx.xx:25565 on my mobile device on the same network but times-out on the browser of the host. Moreover, it is forwarded on both TCP and UDP.
ANSWER
Answered 2020-Mar-27 at 00:12My router (Telstra Arcadyan LH1000) doesn't support NAT loop back, where the external address of the network can be accessed from an internal IP. It rewrites the connection directly to the other network address (itself in my case) which the client rejects because it doesn't expect the rewrite.
SolutionsThere are two solutions: a masquerade NAT rule which most routers do not support and using the internal IP. Additionally, upgrading router firmware may solve the issue, but it's unlikely. In my case, the Technicolor modem has full NAT loop back support, but I'm unable to get one.
Solution 1This rule should be added to the router (accessible at something like 192.168.0.1).
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