in24hrs | every solution in some way | Networking library
kandi X-RAY | in24hrs Summary
kandi X-RAY | in24hrs Summary
If you search for the keyword “IoT platform” on google, it will return about 190 million results within a second. This is the level of proliferation IoT has achieved (especially IoT Platforms) in recent years. Every solution that is in some way related to the IoT, needs a platform. However, whether you develop this platform bespoke or is buy it off-the-shelf would mean a lot to your final product. Moreover, the term IoT platform has many connotations and vendors have overused it to a point where it just does not convey anything meaningful. As businesses and working scenarios are evolving, I am seeing many smaller companies delving into IoT. However, not having own IoT platform is one of the impediments for such an evolution. The easy-lazy answer, as many would suggest is to use freemium or free trial platforms. What lies ahead though is a greater challenge when things scale and costs skyrocket exponentially. When the trial expires or freemium is not enough, users find themselves locked-in and switching over is neither simpler nor easier. Additionally, buying off the shelf solution often means you subordinate requirements or retrofit things to suit what is available. You might end up building a subpar solution if not outright bad. If having full flexibility and control means something to you, this book is for you. I chose to write this book as I saw many of my customers struggling to understand the IoT platform landscape. State of the play has not been balanced with many vendors convoluting the offering to make it look like the only greatest thing built ever. For short-term gains, they have raised artificial constraints and showed superficial problems that only their offering can solve. I believe in empowering customers and this book is a humble attempt to it. The book is not about building a full-blown enterprise-grade system. It is about being agile in a true sense and reducing time to the market without breaking the bank. It is about designing something that you can scale incrementally without having to do a lot of rework or disrupting current state of the work. If you are a small to medium-sized company or part of the development team from a non-IT company, you will find this book quite useful. If you are an independent developer, researcher or learner, you will see the usefulness of the content for your endeavors too. Whether you are new to programming world or have basic to intermediate programming skills, you will find this hands-on book equally useful. The book supports the idea of being frugal at the start and then invest only when and where necessary. It would help you to tap into technology advancements without bank-breaking budgets, and get off the ground quickly, contrary to the longer times required to adapt to the off the shelf or freemium platforms. More importantly, you will be in full control of what you are developing throughout the process. Throughout 12 chapters of this book, I guide you through the step-by-step process of building your own IoT platform. There are must-haves and there are nice to haves; I distinguish the two and focus on how to build must-haves. You would not only save heaps but also will enjoy a control wielding and satisfying learning experience. In the first chapter, I discuss necessary and sufficient qualities that any IoT platform must have & why. I also elaborate on the key question - why should you build your own?. Building your own means understanding at ecosystem level is important, we do that in chapter 2, where block diagram level details of IoT and platform are discussed. Better planning is a key to success that reduces confusion and agony later on. So, I would cover platform wish-list, technical and general requirements for the building of our platform in chapter 3 and 4. The rubber actually hits the road in chapter 5, where we initialize the cloud instance, install required software stack and apply security. If you are eager to jump into the "how" of building things, this is where you might want to start (and read about the "why" later). One of the core elements of the platform is a two-way messaging system bus, which is explained in chapter 6 along with the installation of broker software and securing it. Building of critical components of the platform, and message broker extension with additional functionality is covered in chapter 7. Followed by additional configurations and testing of the core built until that point in chapter 8. In chapter 9, additional micro-services and data access APIs are covered along with the foundation for the rule engine. Then we build full rule-engine and authentication mechanism in chapter 10. In chapter 11, we add some documentation and provide the testing facility for developers with interactive API documentation. Finally, in chapter 12, I address a few commonly asked questions in various forums, discuss a few advancements that are in progress, which you might want to add to the platform when you build it. As I conclude, I leave you with a few possibilities to experiment. Remember that all the code and configuration files discussed in the book are available in this repo. Feel free to star, fork or download them as you wish, and if you have more to add or suggest, I will be happy to hear from you.
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QUESTION
I have this code to send multicast messages to a group. There are no errors while running the program but when I monitor packets in Wireshark the ethernet destination of my packets are of my default gateway instead of something like 01-00-5e-xx-xx-xx
The code:
...ANSWER
Answered 2022-Mar-10 at 14:07244.244.244.1 is not a valid multicast address.
Multicast address are in the range of 224.0.0.1 - 239.255.255.255. The address you're sending to is not in that range. So the outgoing MAC address is not a multicast MAC.
Change the destination IP to be in the range of multicast IP addresses and you'll see a proper multicast MAC address.
QUESTION
How to extract street graph or network from OpenStreetMap ?
...ANSWER
Answered 2022-Feb-17 at 15:56There are many solutions to achieve this goal, I listed some of them below.
- Overpass-apiOverpass-api & overpass-turbo let you use overpass query language to collect ways and nodes of type highway for a city :
QUESTION
I have a UDP sender program here:
...ANSWER
Answered 2022-Jan-14 at 08:46When I tried to change the destination ip address to 255.255.255.255 [broadcasting?]
QUESTION
I have an app (sveltekit) running inside and would like to access it from other devices on my local network.
I can access it normally from the host machine on localhost:3000.
I want to access it somehow from another machine on the local network. Is this possible? Sveltekit cli has --host flag, which outputs the following:
...ANSWER
Answered 2022-Jan-01 at 05:35All that was needed was to change the following VSCode setting. By default it was set to "localhost". Setting it to "allInterfaces" grants access to other devices on the local network.
QUESTION
I am looking for a basic thing yet I have not found not even a single good documentation on getting it done.
I want to allocate a floating IP, then associate it to a network interface of a droplet other than eth0. The reason is I want to have the ability to very easily switch from one IP to the other with a programming language.
In a few words, I want to be able to do these two commands and both should provide a different response.
...ANSWER
Answered 2021-Nov-27 at 00:12In the cloud (AWS. GCP etc.) ARP is emulated by the virtual network layer, meaning that only IPs assigned to VMs by the cloud platform can be resolved. Most of the L2 failover protocols do break for that reason. Even if ARP worked,the IP allocation process for these IPs (often called “floating IPs”) would not integrate with the virtual network in a standard way, so your OS can't just "grab" the IP using ARP and route the packets to itself.
I have not personally done this on Digital Ocean, but I assume that you can call the cloud's proprietary API to do this functionality if you would like to go this route.
See this link on GCP about floating IPs and their implementation. Hope this is helpful.
Here's an idea that needs to be tested:
- Let's say you have Node1(10.1.1.1/24) and Node2(10.1.1.2/24)
- Create a loopback interface on both VMs and set the same IP address for both like (10.2.1.1/32)
- Start a heartbeat send/receive between them
- When NodeA starts it automatically makes an API call to create a route for 10.2.1.1/32 and points to itself with preference 2
- When NodeB starts it automatically makes an API call to create a route for 10.2.1.1/32 and points to itself with preference 1
- The nodes could monitor each other to withdraw the static routes if the other fails. Ideally you would need a 3rd node to reach quorum and prevent split brain scenarios, but you get the idea right?
QUESTION
I have a dataframe in R similar to the following:
...ANSWER
Answered 2021-Sep-14 at 04:44I really love a base R solution, so that's what you'll get from me. It's a bit hacky and ad hoc but it seems to get the job done pretty quickly.
QUESTION
I've been trying to wrap my head around this issue all day, could someone help resolve or at least explain it as if I'm a child?
I have an Ubuntu 16 server, running openssl 1.1, & letsencrypt
R3 support expired last night and now an application doesn't work on all devices because it's intermediate signature is from R3 ?
I've removed the X3 from my cert chain providers and generated fresh SSLs with letsencrypt but it has not solved the issue.
...ANSWER
Answered 2021-Sep-30 at 22:32Okay, what I did was to use this config in getssl.cfg
QUESTION
I have been running a media cluster for sometime without any issues. I have everything networked into two different docker networks... the first network just bridges the docker instance to the local machine, the second network is a docker VPN container that I use for the other media services (an earlier version of what I am working on can be found here: https://github.com/Xander-Rudolph/MediaDocker)
The strangest thing happened today though. I ran the docker update for windows and now docker spools up without any errors or issues, however none of the services work outside of the machine running docker. Usually I have a poke through for a couple of the services in my router (namely wordpress/joomla which is on the bridge) and they work outside of my local network, but none of them are working anymore. I was able to confirm its not the DNS A record because I'm able to use the RDP ports I have mapped for my router, and when I test on another machine in the same network, it can't access the services via the internal IP (but it can RDP).
Anyone have any idea what could have changed to break this? I've already updated all my docker images and even rebuilt my VPN container (before I realized its a networking issue). What are some steps I can do to try to troubleshoot what is going wrong in docker to prevent access outside of localhost?
Update
I've been able to rule out the docker update as the root cause... I upgraded docker on my laptop (which was previously running the same version as my desktop) and its not having the same issue... this configuration must be localized to this desktop... No idea what the issue is... Will try a linux VM on the desktop instead of docker for windows...
Update 2
After a lot of screwing around in both a VM and in WSL, I'm still only able to access the docker services from localhost but not a different machine on my network or via the IP on the host machine (perhaps something similar to this: Can't access localhost via IP address). RDP does work so the computer is accessible but the services are not.
I'm not sure if this is a result of a docker networking config or a windows network config (I'm using WSL with docker installed on ubuntu 20.08) but I'm not seeing anything stick out. I'm going to remove the tag for docker windows but this is definitely an issue with networking and I suspect it has something to do with the fact that the containers are running behind a VPN... although I don't know why I would be able to access them on localhost but not the IP on another VM...
When I run
...ANSWER
Answered 2021-Sep-21 at 02:43Your question: "...What are some steps I can do to try to troubleshoot what is going wrong in docker to prevent access outside of localhost?..."
Troubleshooting help for you, first do you have multiple networking adapters (Ethernet, Wi-Fi, etc.) present on the host. First ensure, the priority of these adapters needs to be configured in correct order so the Windows networking stack can correctly choose gateway routes.
Now, to fix this set your primary internet-connected networking adapter to have the lowest InterfaceMetric value, use can use these Powershell commands from an elevated console:
QUESTION
Hi, I've remixed a template for networked aframe dynamic rooms using a form:
https://glitch.com/edit/#!/power-lily-pancake?path=public%2Fscene.html%3A41%3A0
For some reason whenever I add these lines of code to the tag, the entire project breaks:
ANSWER
Answered 2021-Sep-17 at 15:17afaik the dynamic-room
component is designed to attach the networked-scene
, not update it (since it doesn't handle updates). That's why the dynamic-room example scene does only have a dynamic-room
component, and also why the dynamic-room
is not working with networked-scene
.
I'd throw all the networked-scene
attributes to the dynamic-room
setup, but it's also possible to make the two work together pretty much like you want it:
QUESTION
I want to obtain a list of mutually connected nodes between every pair of nodes in my graph:
...ANSWER
Answered 2021-Sep-10 at 19:00This is not exactly efficient, it's a brute force double loop, but you can do
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