Is it possible to test connections between devices on a network? How can you find out where the break in the connection is? Example of a network
cloud server <-----> modem <----> router <-----> master radio <---> slave radio <----> on site fixed field device
Thank you
Related
I am planning to create a very simple home\office monitoring system, where I will be able to connect sensors using Mosquitto broker on a Raspberry Pi. The sensors will publish data to the broker and I will be able to see the data as a subscriber.
I have a publisher that periodically publishes messages to the Raspberry Pi (Mosquitto broker) in the house in the same LAN network. But I want to connect a sensor that will be located at my office to the same broker, so the connection can't be except online.
The problem that I am facing at the moment is that I want to connect a sensor to the Raspberry Pi but I need to do it over the Internet given the limitations of hardware. How do I connect the sensor to publish to the broker that resides in the Raspberry Pi from outside the LAN network? I just checked and my public IP address could have thousands of addresses underneath it, how do I know which one is me and connect to it?!
Somewhat depends on your home network. If your ISP uses so called "Carrier Grade NAT" which is increasingly common due to the fact that few IPv4 addresses are now available, you cannot make a connection from the Internet to your local network.
Otherwise you can make a connection inwards and so your remote sensor just needs a TCP/IP connection. We would need more information on the sensor to show you how to do that. To find your public IP address, you visit https://www.whatismyip.com/ from a computer on your local network. (To find out if you are stuck with carrier grade nat, ask your ISP or do a reverse lookup on your public IP address, you may be able to tell). You will also need to configure the firewall on your router so that it allows inbound connections to a PORT that you choose (on the outside) and map that to the internal IP address of the Pi and the port configured on Mosquitto for handling MQTT traffic.
For carrier grade NAT or if you cannot configure your router's firewall to allow incoming connections, you should use another MQTT broker on the Internet somewhere. Then configure your Pi broker to bridge to the Internet broker.
The Owntracks documentation has a quick tutorial. There is also information in the Mosquitto documentation on how to do this.
In this case, your Pi broker is making a connection out to the internet which works fine on any WAN if you are not excessively blocking outgoing traffic.
In either case, do not forget that any traffic over the Internet is insecure. You will need to set up SSL certificates along with a username/password combination to secure the traffic.
Easy!
Just add a port forwarding (in your local router 192.168.x.x) to your raspberrPi ip and MQTT (usually port 1883).
Then your sensor should be connected to internet and send a topic/payload to your public IP address at home...
I do this for android apps
- owntrack
- juiceSSH
- raspicheck
- myMQTT
- openHAB
- Yatse (For Kodi remote)
But do not forget when you open a port you will need to secure it access somehow...
and your public i.p. can be automatically change by your ISP (InternetServiceProvider)
I am running an Ubuntu server with my laptop through an Orcale VirtualBox and I try to maximize the bandwidth of my home server, as it really slows down my internet connection. My router supports up to 300Mbit upload/download speed and my laptop wifi's card up to 150bit.
I configured my server with the following(static IP, configured by vim /etc/network/interfaces):
auto eth0
iface eth0 inet static
address 192.168.1.240
netmask 255.255.255.0
gateway 192.168.1.1
dns-nameservers 192.168.1.1
192.168.1.1 is my default gateway, and I just configured a static IP which ends with 240.
When my laptop's WIFI is on, I can easily access the server's files(.html files etc) through chrome from any computer on my house, as I just need to enter the server's IP into the browser, plus I can access the server through SSH. But when It's off, I can't even access the server's HTML files through the laptop itself, though I can see that the server is still running on VirtualBox. When I turn the WIFI once again, I can run services which require Apache2 but they really slow my internet connection, as a result I can barely surf the web. I am trying to configure the server to use only the bandwidth of my router, since my actual internet connection is 30 Mbit download and 1.90 Mbit upload(according to speedtest), and It probably interferes with it. Is it possible to access the server without WIFI connection, so it will purely use my router's speed?
Any help would be appreciated.
1) Looks like you using bridged networking in VM config. When your network adapter is connected to real network - you can interact with your VM via network bridge. When it's not connected - your bridge is also closed. If you need to interact with your VM without WiFi connection - you can add one more virtual network adapter to you VM config: use "Host-only" adapter and configure it on both VM and host PC. Your VM will use new host-only adapter to interact with your PC, and old bridged adapter to interact with other network.
2) Check your WiFi speed near the router. Maybe it's too far or provides too weak signal.
PS. Sorry for my poor english.
I have developed a p2p video chat using Webrtc. I am aware that STUN or TURN server is required to identify the public IP behind NAT. Currently am using Google's STUN server.
I have the application installed in the server connected to the LAN which will not have internet access, do I need to install the STUN server in my server to make Webrtc video chat work within the LAN?
Peers should be able to connect within a LAN (on the same side of a NAT) without STUN, i.e. using the host candidates. Try it out!
In general, you won't need a STUN server. However, depending on the firewall configuration, you may actually need STUN (and even TURN). For example, at the SFHTML5 WebRTC Hackathon, we were on a corporate guest WiFi network that blocked local UDP and TCP traffic. Making successful calls required a TURN server in this case.
It's possible to mobile client on 10.20.0.2 network connect to wcf service host on other network ? They are connected by usb cord by now and I want test that they can connect...
If you have a network route, I don't see why not, provided that WCF itself can do networking.
I resolve this by set in web site binding in IIS ip address and host name 192.168.x.x and find that both - mobile and pc connected throw usb are in the same network :)
I created a vb .net app and basically it connects to the server (my brother's computer at his house) and sends messages. The problem I'm having is, we both have routers. The only way I'v gotten all of this to work, is by both of us connecting ppeo broadband and then our ips work, otherwise the "real ip" is used for all the pcs in my house. How can I connect tcp to him wothout him having to connect broadband. Because to connect broadband he needs to be connected to an ethernet port, so then he cannot be wireless.
Thanks
I don't know what you mean by "connect broadband", but if the computers are not on the same local network, and you have a NAT router in between, you will either have to connect them via a VPN (like Hamachi for example) or configure port forwarding on both sides on the routers.
See: How do you get Java sockets working with public IPs?
Some routers also have "Dynamic Port Forwarding", where if you are using, say port 8084 for your traffic, both your and your brother set your routers to dynamic port forward port 8084.
The router then listens for client computers connecting across port 8084, and when it sees that traffic, it will route traffic across that port to the client computer that first requested it.
Another popular "NAT-traversal" technology is UPnP. See this SO question and associated article for more information on how to use .NET to control UPnP. Again, router hardware must support it and be configured to use UPnP.
Edit: Untested, but you could try also to use and IPv6 tunneling software such as the one from go6 to create a public IP. This is like VPN, but one-sided, and less private.
Rather than router configuration, you could use a VPN. Hamachi is free and easy.