heartbeat | minimalist Java framework for single-board computers
kandi X-RAY | heartbeat Summary
kandi X-RAY | heartbeat Summary
heartbeat is a minimalist Java framework for single-board computers (C.H.I.P., Raspberry Pi, BeagleBone, etc.)
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Top functions reviewed by kandi - BETA
- Start the heartbeat thread
- Waits for a UDP datagram from the given socket
- Create a Pin
- Runs the service
- Returns a string representation of this pin
- Set the device mode
- Runs the pin
- Gets the application directory
- Compares this pin with the specified object
- Stops the heartbeat thread
- Writes a boolean value
- Read a pin
- Returns a hashCode of the current instance
- Closes the reader
- Reads a GPIO pin
- Closes the underlying reader and output streams
heartbeat Key Features
heartbeat Examples and Code Snippets
Community Discussions
Trending Discussions on heartbeat
QUESTION
I have a node.js file that subscribes to a topic and upon receiving a published message scans a local mysql db for the most recent entry in a variable named "command". Command values will trigger various responses, but I have left this portion out since my issue is before this.
My mysql query appears to be giving me errors. I am trying to look for the most recent entry of the command column and assign the value to a var command. I thought this code would do the trick:
...ANSWER
Answered 2022-Mar-14 at 00:05I am getting the following response which seems to indicate an error in the mysql query
That's not an error in your MySQL query. It's a null reference error because you're trying to use result
outside the callback.
Changing your code to this will work:
QUESTION
Using the RabbitMQ.Client v. 6.2.2 I am facing the issue that the EventingBasicConsumer sometimes stops receiving messages if a broker from the cluster fails.
Looking into the issue I am logging the recovery attempts and they usually work quite well. But this weekend the worker stopped receiving messages again and I am searching for advice how to find which side is at fault. The RabbitMQ Server oder the Client and what to do about it.
The configuration for the EventingConsumer is pretty much the default with AutomaticRecoveryEnabled=true and heartbeats every 60s + Topology recovery enabled
...ANSWER
Answered 2022-Mar-10 at 21:51Please upgrade to version 6.2.4. I fixed a bug that could have caused what you report here.
NOTE: the RabbitMQ team monitors the rabbitmq-users
mailing list and only sometimes answers questions on StackOverflow.
QUESTION
I have downloaded apache karaf 4.3.3 on several Ubuntu18 machine. When I try to install feature or run any command through client, I get the below log trace. I am able to run the client when I am on the server, but it fails through the script.
command i'm using are
...ANSWER
Answered 2022-Jan-18 at 21:37I came across a similar problem with the script returning a "Closed" status.
After some tests, I found the script fails when there is no TTY (as is the case if you use tools like ansible)
You should use the 'batch mode' included in karaf client script, so your command would become:
QUESTION
I know there are a lot of questions and answeres regarding this topic out there, but nothing matched my specific issue.
I am using the following versions
- Angular 10.0.14
- @aspnet/signalr 1.0.27
- ASP.NET Core 3.1
VERSION UPDATE:
- I just replaced @aspnet/signalr 1.0.27 by @microsoft/signalr 5.0.11 -> same issue.
The SignalR connection works pretty fine until I add an accessTokenFactory in the Angular frontend.
Frontend
...ANSWER
Answered 2021-Oct-19 at 12:06Browsers do not support headers for websockets, therefore the bearer token has to be added as query string parameter. We hit the maximum length for URLs due to the length of our bearer token. We could shorten our token or use a reference token, see also: https://github.com/aspnet/SignalR/issues/1266
Hope this helps others as well.
QUESTION
I have a requirement to send and receive normal data on the same TcpStream, while sending heartbeat data at regular intervals. In the current implementation, Arc was used for my purpose, but it compiled with errors. How can these errors be fixed, or is there another way to achieve the same goal?
...ANSWER
Answered 2022-Mar-05 at 20:59Several errors in your code, although the idea behind it is almost good. You should use any available tool in async as possible. Some of the needed/desired changes:
- Use
tokio::time::sleep
because it is async, otherwise the call is blocking - Use an async version of mutex (the one from
futures
crate for example) - Use some kind of generic error handling (
anyhow
would help)
QUESTION
I am creating a FastAPI server with simple CRUD functionalities with Postgresql as database. Everything works well in my local environment. However, when I tried to make it run in containers using docker-compose up
, it failed. I was getting this error:
ANSWER
Answered 2021-Sep-29 at 20:31First, the SQLALCHEMY_DATABASE_URI
in database.py
should match the user, password and database name suplied in Your docker-compose.yaml
. Ensure that You are running docker-compose up
with correct environ. In Your case, the environ for docker-compose up
should be:
QUESTION
Celery disconnects from RabbitMQ each time a task is passed to rabbitMQ, however the task does eventually succeed:
My questions are:
- How can I solve this issue?
- What improvements can you suggest for my celery/rabbitmq configuration?
Celery version: 5.1.2 RabbitMQ version: 3.9.0 Erlang version: 24.0.4
RabbitMQ error (sorry for the length of the log:
...ANSWER
Answered 2021-Aug-02 at 07:25Same problem here. Tried different settings but with no solution.
Workaround: Downgrade RabbitMQ to 3.8. After downgrading there were no connection errors anymore. So, I think it must have something to do with different behavior of v3.9.
QUESTION
I need to get the Chainlink prices of a token from a specific time to the most recent round. This time varies based on user input but will be relatively short windows (1 day to 2 weeks max) based on the heartbeat of the token. This is used to calculate the price of a payout both in the smart contract and on the application homepage.
To get historical price data Chainlink needs a 'roundId' which is a non-incremental value.
What is the best way to either get all roundIds for the given time window from Chainlink or record them in a way that is open, decentralised and can be accessed in a solidity smart contract?
...ANSWER
Answered 2021-Dec-17 at 22:55Each proxy contract for a Chainlink Price Feed can have multiple underlying aggregator contracts, with one of them being set as the 'active' one at any given instance. Ie whenever the Chainlink Labs team deploys new versions of the aggregator, they update the proxy contract to set the current aggregator version to be the new one, and all new price data starts getting written to the new aggregator.
Based on this, if you want historical price data for a proxy contract/price pair from the last couple weeks or so, you'd need to go to the current aggregator for the proxy contract, then get the current round info (including timestamp), then go back in aggregator rounds in a loop until you get to a round that is less than your search parameter timestamp.
To find the current aggregator contract address for a proxy contract, you can call the aggregator
getter function in the proxy contract.
The phase ID can be thought of as an incrementing ID number that the proxy contract uses to identify each aggregator as it gets added to the proxy, so the first one is 1, second is 2 etc. To find out what the current phase ID is of the current aggregator, you can use the phaseId getter function in the proxy contract.
Aggregator round IDs start from 1 and increase by 1 each time. Eg you can use the aggregator latestRound
getter function to find the last round that it stored, and then start from that number as an input parameter to getRoundData
, and then reduce the number by one and loop through until you reach your point in time.
Unlike Aggregator round IDs, proxy round IDs are those big really long numbers like 36893488147419113293
, and are actually just a derived value based on the aggregator phase ID and the aggregator round ID. This is done to ensure the proxy round IDs are always increasing in value, and that there will never be any overlap between the same rounds across different aggregators, eg round 5000 from aggregator with phase ID 1 should have a lower proxy round ID that round 5000 from aggregator with phase ID 2
In Solidity you can easily replicate the proxy round ID derived value with the following formula, passing in the phase ID of the aggregator and the aggregator round ID
QUESTION
I'm currently working on a desktop application using Swing, communicating with a server over HTTPS. However, on one production machine which I will have to support, the current development build throws a NoClassDefFoundError
despite the class being actually included in the JAR.
The situation is quite simple: I'm starting up the Swing application and configure a server to contact, which will then be used for a quick HTTPS connection test (in the class HTTPClient
). I facilitate OkHttp for all communication with the server.
My HTTPClient
resembles this code:
ANSWER
Answered 2021-Dec-14 at 11:51In my case, since I had set a timeout of 1,500 milliseconds on the future and because of the slower CPU clock speed of the misbehaving machine, the class was not fully initialised when the timeout occurred. Turns out, OkHttp is more or less the culprit, it takes more than 5 seconds to inistalise the client on the given machine.
All in all, I am no longer applying any timeout on the first try of the connection test to give OkHttp enough time to initialise itself.
Note that this would not solve the problem if the initialisation of the HTTPClient
was to fail at a different point in the application lifecycle. But since the first try of the connection test is the first place to call into HTTPClient
, this is the only place where it can be initialised.
QUESTION
I am working on a "heartbeat" application that pings hundreds of IP addresses every minute via a loop. The IP addresses are stored in a list of a class Machines
. I have a loop that creates a Task
(where MachinePingResults
is basically a Tuple of an IP and online status) for each IP and calls a ping function using System.Net.NetworkInformation
.
The issue I'm having is that after hours (or days) of running, one of the loops of the main program fails to finish the Tasks
which is leading to a memory leak. I cannot determine why my Tasks are not finishing (if I look in the Task list during runtime after a few days of running, there are hundreds of tasks that appear as "awaiting"). Most of the time all the tasks finish and are disposed; it is just randomly that they don't finish. For example, the past 24 hours had one issue at about 12 hours in with 148 awaiting tasks that never finished. Due to the nature of not being able to see why the Ping
is hanging (since it's internal to .NET), I haven't been able to replicate the issue to debug.
(It appears that the Ping
call in .NET can hang and the built-in timeout fail if there is a DNS issue, which is why I built an additional timeout in)
I have a way to cancel the main loop if the pings don't return within 15 seconds using Task.Delay
and a CancellationToken
. Then in each Ping function I have a Delay
in case the Ping call itself hangs that forces the function to complete. Also note I am only pinging IPv4; there is no IPv6 or URL.
Main Loop
...ANSWER
Answered 2021-Nov-26 at 08:37There are quite a few gaps in the code posted, but I attempted to replicate and in doing so ended up refactoring a bit.
This version seems pretty robust, with the actual call to SendAsync
wrapped in an adapter class.
I accept this doesn't necessarily answer the question directly, but in the absence of being able to replicate your problem exactly, offers an alternative way of structuring the code that may eliminate the problem.
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