BaseStation | DCC++ Base Station for Arduino Uno and Mega
kandi X-RAY | BaseStation Summary
kandi X-RAY | BaseStation Summary
DCC++ Base Station for Arduino Uno and Mega
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QUESTION
Using Spring Boot 2 for an IoT application, I notice that the startup time for Spring is disproportionally slow. The platform is a Raspberry PI 2B - of course, this is going to be significantly slower than a PC. For normal code execution I measure a 20x to 50x difference.
- Spring boot startup time on my PC (Win10 x64): 5 seconds
- Spring boot startup time on the PI (Ubuntu Server, ARM java in docker running a jar): 11 minutes
If I use the highest factor I've ever measured (50x), I would expect to see a startup time of less than half of the current state. So far, I tried:
- Excluding dependencies from auto configuration (now minimal with only only spring-boot-starter-web, kotlin, undertow, webflux, reactor and kafka)
- Logging on DEBUG to see what was happening during quiet periods (mostly beans being set up, nothing suspicious, though some beans take several seconds to load)
- Different docker image for Java on ARM (no effect)
- CPU is consistently at 100%, memory is around 20% and there is plenty of disk space
My preliminary conclusion is that loading beans eats all the CPU cycles. I imagine that initializing a bean should not take several seconds, but it does. What could be the bottleneck here? Can I get Spring to load faster in any way?
Here is the first part of the output from a PC:
...ANSWER
Answered 2019-Nov-22 at 09:27Update:
For those reading this, I moved back to OpenJDK in 2019 due to the new Oracle policies. What I noticed is that OpenJDK has made significant performance improvements recently. If you use OpenJDK 11 and above, it has similar performance to Oracle JDK and you can easily configure its language level to work with Java 8 code. That said, if this does not work for you, try the below.
I moved to a new image: Oracle JDK instead of OpenJDK as @snodnipper suggested.
There were several things I had to do including installing a more recent version of Java 8 than the one available in the standard repository. This is the Dockerfile that ended up working for me, and now the application starts in 2 minutes.
QUESTION
I have a C++ std::map
that I'm using to store information about connected components. Here's the segment of code from my BaseStation
class, it's very basic
ANSWER
Answered 2019-Nov-12 at 02:13std::map
stores the key as const
.
value_type
std::pair
That means when you get the key from map
(like ptr->first
), you'll get a const
BaseStation
.
I think you should declare BaseStation::getName()
as const
member function, since it's not supposed to perform modification.
QUESTION
I am getting familiar with Tiny OS enviroment, currently I am at lesson 4 "Mote-PC serial communication and SerialForwarder" and I am stuck with the part where I have to listen to serial port for any incoming data. I am trying to implement a simple example where I need to use TestSerial script to listen for any incoming messages however when I run
...ANSWER
Answered 2019-Mar-23 at 14:46I do not think your issue is with toscomm, as long as the library ends up being loaded successfully you should not be getting any issues. I always used to get the same exception that you are seeing being thrown over there everytime I used the serial but never bothered to fix it as it didn't really hamper the operation of the serial port.
In the end, I got rid of the exception by copying libtoscomm
from the {TOS_ROOT}/tools/tinyos/java/serial/
directory to one of the directories that TinyOS is looking for libraries in. In your case you would put a copy of the libtoscomm
file in one of the directories /usr/java/packages/lib/i386
, /lib
or /usr/lib
.
You can try doing that and seeing if that resolves the exception issue for you.
What I suspect might be causing your issue is that you do not have TestSerialAppC loaded onto you mote and connected to the serial port. Have you made sure the mote is connected to the serial port?
I loaded ran the application on a mote and got the output below, so the issue is not with TestSerialAppC
QUESTION
I am using Lora technology to send Data from a Lora sensor (Elsys ERS: link) to a Lora Base station (multitech MultiConnect Conduit IP67 Base Station: link). I have configured the sensor using an android application (using NFC) as in the manual. For the configuration, I followed the manual (link) of the base station and a youtube tuto (link), but I still do not know how it works.
Now I want to know how to receive a data from this sensor using the cited base station.
PS: the multitech bas station is equipped with a lora antenna.
Thank you for your help.
...ANSWER
Answered 2018-Jul-25 at 15:15The solution is to update the software version, called Application Execution Platform (or AEP). Then, you have to "Save and Restart" the system. After that, you can add all the nodes you need by only using the AEP. It is recommended to "Save and Restart" each time you do a modification on the system. Elsewhere, the modifications risk not to be considered by the system.
For more information, please visit the YouTube channel of Multitech: https://www.youtube.com/watch?v=6-Nw7I6yCuY&t=296s
Good luck.
QUESTION
I have a TableView with cells on my first View, and it works well. But I want to click on some cell then should appear new View with new Table View & cells. But after click, I can see only TableView without any cells.
code of SecondViewController ...ANSWER
Answered 2019-Jan-04 at 21:09I think what you are asking is .. When you click on a cell in your tableview, you navigate to a new view controller. And this new view controller has a tableview that is not being populated with any cells.
Essentially your question is.. Why is your tableview empty.
1) Have you checked if you correctly set the table views datasource?
2) Is the datasource empty?
3) Does your tableview have a visible height/width?
QUESTION
Please check the image. I want to align the input field with the input field name, more in the central, right now the input field aligns on the same level of the input field name.
Following is the code
...ANSWER
Answered 2018-Aug-14 at 14:54Try giving the .form-group .basestations
div vertical-align: middle;
This should align all the items in an element vertically in the middle. If this doesn't work, please tell me!
Quick test would be:
QUESTION
I need to parse log files into an ArrayList of ArrayLists. The regex is working, and I can get the correct results in a variable or .csv output. The problem is that I need to manipulate the output by adding a value in entries where a condition is not true, and appending additional values based on index[0] (filename) matches between the original and to-be-appended rows.
Each log file can have 1-~200 entries, depending on number of field collected inputs. Log file entries are multiline and variable; but structured, so all variations are known (n=18 regexes - not all relevant to the snippet, below). I need to be able to manipulate row content based on some of those variations.
This means I need to loop through individual, potentially unequal-length rows (i.e across the table) to edit and append, and loop over each of the rows (i.e. down the table). So, simple arrays won't work as well as ArrayLists.
I'm successfully creating an ArrayList of a single ArrayList (all of what should be individual rows are put into a single ArrayList, which then goes into the parent ArrayList...).
Trying to get individual ArrayLists by moving 'covArrayList = new ArrayList(covArrayList);' between the 'while ((corrLine...)' and 'for (String..)' loops, or into the 'if(fileMatcher.find)' block returns multiple outputs per regex match, and changes the order, so values can't each be linked to a specific 'file1Name'...
FYI: I'm using JDK 10. I'll have to refactor down so JRE 8 can run the program, but want to do that later for developmental reasons.
This is a subset of my code, which is all within the main method:
...ANSWER
Answered 2018-Jul-09 at 19:55So, I figured it out. :) yay me.
My previous code would add all of the regex matches to a variable (worked great!), then add that variable to an ArrayList, and finally try to add those ArrayLists to an ArrayList of ArrayLists.
...and so I'd end up with multiple copies of all the values in an ArrayList, or all the values in a single ArrayList, inside an ArrayList.
The following code initializes a new "ArrayList coverageOutput" per filename found, then puts the subsequent regex matches into the correct ArrayList; then each new ArrayList is added to an ArrayList of ArrayLists. Not sure how exactly this working, but it is.
If someone smarter/more experienced than me would explain how it's working, I'll upvote your explanation and think you're the BOMB! :)
QUESTION
...sorry for the length... ...and the goofy code/text entries. I'm still a noob.
I need to parse through Trimble differential correction log files (example follows) get specified values, and put them into a .csv file for QA before uploading to Oracle. I chose Java for professional development because it's the language used to develop other in-house software.
I'm pointing to a single file until I can get the output correct, then I'll work on looping through file structures.
My requirement: Read log (.txt UTF-16LE) and get specific values from several mostly similar blocks of text; then find additional values in subsequent mostly similar (but different from the first blocks) blocks of text. Put those values into a .csv for import into a spreadsheet for QA per log file.
The values in the text blocks can vary, but all potential variations are known.
I'm only concerned about the first blocks of text, ATM. The REGEX for all the values I'm interested in are below.
...ANSWER
Answered 2018-Jul-03 at 21:57Only loop through file once. Read and collect data as you go. Don't build output until you have all the data. When you see a new Rover file
entry, write output (unless first entry) and clear values. When you reach the end, write output (if any).
Isolating code in a class might make it easier to reuse printing logic.
Example:
QUESTION
In my Django template I am having some problem to hyperlink. The link is a dynamically generated IP (not a file location).
in views.py
...ANSWER
Answered 2018-Jun-26 at 11:55You wouldn't use {% url %}
at all. That's for generating links to other URLs within your Django app. You want to link to an IP address, so just put that value in directly:
QUESTION
I have a dropdown selection and 'submit' button in the page. Some fields disappears upon specific dropdown selection. I can hide/show all other fields but except password field. Whenever I hide the password field with a jquery the submit button doesnot work. following are my code files.
- HTML template django
ANSWER
Answered 2018-Jun-06 at 16:03Your password field have attribute required
. Which means that this field is required to submit the form.
To prevent this behavior, during form submission you need to have the following markup.
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