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--- network_protocol_programming_lab:8_smartrf [2022/04/18 16:44] – [4C Installation] fangenoorth
+++ network_protocol_programming_lab:8_smartrf [2022/04/29 08:43] (current) – [4C Installation] fangenoorth
@@ Line 14: / Line 14: @@
 To install //4C// several steps have to be done:
-  - Login as root to the BeagleBone Black and download the //cc1200 daemon// from [[https://kn-pr.tkn.tu-berlin.de/ppl/cc1200d.tar|here]]. Unpack ''cc1200d.tar''. Copy the library file <code bash>cp libcc1200.so /usr/local/lib/</code> To regenerate the dynamic linker cache execute <code bash> ldconfig</code> and finally start cc1200d by entering: <code bash>./cc1200d</code> //cc1200d// will create a log-file. Look if there is some output.
+  - Download the //cc1200 daemon// from [[https://kn-pr.tkn.tu-berlin.de/ppl/cc1200d.tar|here]]. Unpack ''cc1200d.tar''. Copy the library file <code bash>sudo cp libcc1200.so /usr/local/lib/</code> To regenerate the dynamic linker cache execute <code bash> sudo ldconfig</code> and finally start cc1200d by entering: <code bash>./cc1200d</code> //cc1200d// will create a log-file. Look if there is some output.
-  - Go back to your PC or laptop. Download Version v14.16.0 of [[https://nodejs.org/en/|Node.js]] for your operating system (Linux, MS Windows or Mac OS X) and install //Node.js//. Newer versions of NodeJS should also work, but are untested.
+  - Go back to your PC or laptop. Download Version v14.16.0 of [[https://nodejs.org/en/|Node.js]] for your operating system (Linux, MS Windows or Mac OS X) and install //Node.js//. Newer versions of NodeJS should also work.
-  - Download //4C// as a ZIP-File from [[https://kn-pr.tkn.tu-berlin.de/ppl/CC1200-Control-Center.zip|here]] and uncompress it to your favorite location. Edit the file ''4C.js'' in directory ''CC1200-Control-Center''. Find in file ''4C.js'' the line: <code bash>var BeagleBone = '192.168.178.37';</code> and change the IP address to the dress of your BeagleBone Black. Save ''4C.js'' and exit.
+  - Download //4C// as a ZIP-File from [[https://kn-pr.tkn.tu-berlin.de/ppl/CC1200-Control-Center.zip|here]] and uncompress it to your favorite location. Edit the file ''4C.js'' in directory ''CC1200-Control-Center''. Find in file ''4C.js'' the line: <code bash>var BeagleBone = '192.168.178.37';</code> and change the IP address to the address of your BeagleBone Black. Save ''4C.js'' and exit.
   - If not already done, open a your favorite terminal app (terminal in Linux or Mac OS X, Powershell in MS Windows) and change to directory ''CC1200-Control-Center''. Start //4C-Web// by entering: <code bash>node 4C.js</code> //4C-Web// will output: <code bash>listenig on *:3000</code>
   - Now open your Browser (remember: Chrome, Firefox or Safari) and go to the url: <code bash>http://localhost:3000</code> Now you will see the //4C// window.
+**If you work inside uni with your own machines the above setup will not work.** This is because the BeagleBones reside in their own subnet to which you don't have access from your laptops connected to eduroam for example. This issue arose already in the earlier steps. Back then we solved it by first sshing into the inna server (or via JumpHost) and then ssh into the BeagleBones. But now the situation is a bit different, because we cannot instruct our Webbrowser to do this. Instead we have to use a technique called //SSH port tunneling//. This allows us to forward traffic for a certain port from your local machine to a (possibly different) port on another machine, tunneling the traffic through a third host.
+Luckily the command to set this up is quite easy. First execute steps 1 to 3 from the above. However in step 3 enter ''localhost'' instead of the BeagleBone's IP address. Then on your host enter the following into a terminal:
+<code bash>
+ssh -N t27@inna.tkn.tu-berlin.de -L 4711:<IP of BBB>:4711
+</code>
+This tells ssh to forward packets arriving on port 4711 on your local machine (from the node webapp) to port 4711 on the BeagleBones (to the cc1200 daemon) using the inna server as a intermediate Jump Host. Note that the terminal window needs to stay opened and this ssh call should not be terminated, otherwise the tunnel will be closed as well.
+Now you can start and connect to the webapp as described in step 4 and 5.
 ===== First Steps with 4C =====