Do I need logic level converter?

Chuckster1

I'm trying your TCP telemetry solution.
I'm benchtesting my APM 2.6. I'm using the RPI model B+ . I have the red and black wires from the apm (DC plus 5V and ground) getting power directly from the GPIO on the RPI.

When I try to connect the UART serial data, (TX to RX and RX to TX), the RPI displays a black screen. My RPI will boot up just fine with everything connected until it goes to home screen (I believe this is when the GPIO is initiated).I believe the RPI UART needs 3.3v, and maybe the APM is using 5V?

Do I need a logic level converter to interface the 2? The RPI is connected to a powerful usb hub for testing.

Sinamics

I never had to use a logic level converter.
But in my last projects , im using TTL to ethernet adapter. This will eliminate the problems you are experiencing.

http://www.goodluckbuy.com/rs232-ttl-to-ethernet-tcpip-rj45-converter-module.html

This adapter also supports UDP. 🙂

Chuckster1

Hello again.
I also tried the UDP setup. I have the ETH001 module. I was unable to get the software you described to interface with this module. When I search in LAN, nothing comes up. However, I did find alternate software to communicate with it via Web page when hooked directly to my laptop. This software allows me to pick telnet port number , UDP mode, telnet server address, baud, parity, etc., so I am successfully communicating. is this enough information to work with the UDP Redirect file? Also, when I try the redirect and plug in my ethernet cable, the RPI ignores the WiFi adapter and starts looking using the ethernet cable.

Sinamics

I was also struggling a little to get communication with this adapter, but i got it going somehow..
The redirect file in RPI just forwards all traffic to specified IP adress (or DynDns )
Yes it should work.

Its imporant that you use 0.0.0.0 in the script.

This is what im using.

#!/bin/bash
ip=`dig +short ` My Dns
echo $ip
/root/udp_redirect 0.0.0.0 14550 $ip 14550 &

udp-send.zip

Sinamics

any progress?

This is my RPI & Pixhawk current condition.

image 208298225654cd2cb8e9617828099712.jpeg

Chuckster1

Wow!
What happened to your pixhawk? Did it catch on fire? I'm still trying to get UDP working. I'm still not sure on a couple of things.

Inside the udp_redirect file with the print command, is this correct? ("Usage: % 0.0.0.0 14550 192.168.1.233 14550\n"
I dont think 192.168.1.233 is correct but its my laptops ip address. Do I have to force Dynamic DNS some kind of way?
Also, in this script, do I have to add GCS dynamic DNS name after short? Is that how my laptop name appears on my network? "MINE-HP" or is that a DNS address assigned and if so, how can i obtain a DNS address?

#!/bin/bash
ip=`dig +short `
echo $ip
/root/udp_redirect 0.0.0.0 14550 $ip 14550 &

Your help is GREATLY APPRECIATED.

image 88770275154ce62db07db0216788691.jpeg

image 166986748754ce62db098e2127016593.jpeg

image 201207588254ce62db0a0af014659967.jpeg

Sinamics

My frends garage got burned up, and my pixhawk and rpi ++ was unfortunately located there. So no i have ordered Navio+ with Odroid-C1.. 🙂

#!/bin/bash
 
ip=`dig +short `         (This line just grabs the IP adress for the dyndns name you put here.)
echo $ip                        (Outputs the ip adress when you start the script)
/root/udp_redirect 0.0.0.0 14550 $ip 14550 &

If you want to use the redirect file with static ip, just put it like this.

/root/udp_redirect 0.0.0.0 14550 GCS_IP 14550 &

So if your laptop(192.168.1.233) is where you want the stream to point at, you could use your line like this;

/root/udp_redirect 0.0.0.0 14550 192.168.1.233 14550 &

copy the attched file to your rpi.
Chmod 755 to the file
start the redirect with this command. sh udp-send.sh

If you still got problems, you can open port 23 to PI ip_adress and send me PM with your external adress and i can log on to PI and have a look.

Chuckster1

Hello again

I was unable to get port 23 open on my RPI, despite configuring port forwarding on my router and putting in the RPI local address. I'm pretty sure I tried everything you said step by step EXCEPT I never got Ethernet2UART software working. Is there any way you can try the software I'm using http://www.wvshare.com/product/UART-ETH-E001.htm and let me know your exact setup when configuring through webpage(192.168.1.117)? I also ordered a couple of different modules hoping that it will recognize your software (Ethernet2UART) the wvshare.com link has some cool stuff and a nice PDF file on the module as well.
Also, were you using a model B or B+ RPI? I'm using the B+.

Thanks a lot

Sinamics

I will check and revert.
I was using PI B last time, but i dont think it matter.

Sinamics

What happens when you start the redirect script? can you see that the script is running?
maybe i can make a short video or something explaining step by step.

Chuckster1

The gcc compile command went fine, and i made it executible. It shows up on my desktop like a gear symbol.
One time, I got

[1] 2894
Useage: .udp_redirect 0.0.0.0 14550 192.168.1.233.14550

One time, I got

[2] 2578
[1]  EXIT 127                     /udp_redirect 192.168.1.180 14550 192.168.1.233 14550

One time, I got nothing...the cursor just goes down and sits there.

I tried so many different ways. At first, I got the "Can't bind our address" error, but I'm past that. Every time I run it now, it does not go back to terminal prompt, but acts like its in the middle of trying to do something.

Chuckster1

Also, 1 other thing, when I start the redirect script, with or without the UART module hooked up via ethernet cable, it ALWAYS kills my usb Wi-Fi adapter, that was just blinking blue and working fine just before I started it, so the RPI is trying to do something.

Sinamics

That sounds correct if the proccess is not working in the background.
Try to add & at the end of the command.

eg.

sh udp-send.sh &

Sinamics

Antoher thing you could try is using socat.
It will do the same as redirect script.

Try typing the following:

socat UDP4-RECVFROM:14450,fork UDP4-SENDTO::14450

Change the port number and your gcs ip to your needs..

Chuckster1

For the socat, is the receive from 0.0.0.0 or local rpi address? When the udp_redirect script is successfully running, what should I see? Is it like running the Gstreamer pipeline with lots of info, or does anything come up?

Chuckster1

Hello again. How is the weather in Norway? Its supposed to be 5 degrees farenheit tomorrow morning here:-(. Anyway, a video would be great and much appreciated, I'm not 100% sure I'm doing everything right.

Observations:
Rpi has solid amber light and blinking green. Uart module has solid green and blinking amber. This is before and after starting the redirect file. Apm is not blinking at all. I did pull the send or receive wire from the UART, and all my blinking ethernet lights quit.

I do think my original micro sd was corrupt, because I burned a fresh copy of Wheezy on a different micro sd card, and my RPI now allows my wifi adapter to keep blinking when the ethernet cable is plugged in. But I still can't get it working. Not sure which port to use either, just trying 14550?? I am sure about my local Ip addresses,

A video would be awesome, and it might help someone else better understand it as well. Thanks for all your time.:-)

Sinamics

Hi
Weather is not to bad, around 0 degrees and 5cm snow. 🙂

For the socat, is the receive from 0.0.0.0 or local rpi address? When the udp_redirect script is successfully running, what should I see? Is it like running the Gstreamer pipeline with lots of info, or does anything come up?

socat UDP4-RECVFROM:14450,fork UDP4-SENDTO:<DynDns>:14450

The above line will receive from localhost UDP port 14450 and forward to the specified DynDns at port 14450
When you start the Redirect script, you wouldn't see anything.

If you type ps ax you should see that redirect has its own proccess number.
I will try to make a video example for you during the weekend.

Chuckster1

Greetings! I got it to work over my local network!! Thanks a million. "Socat" gave me an error but who cares. I had to change the baud rate to 57k(not sure if this mattered or not) and set the module to "UDP mode" and not "UDP server". As soon as my wifi adapter started blinking like crazy, I knew I had it. So excited. I'm going to cram all this stuff into a Easy Star 2. Did you say if it worked over local network, then it should work on cellular network?

Sinamics

Perfect.
Glad you made it. If it work at local network it will also work at cellular network. 🙂
What kind of modem are you suppose to use?

Chuckster1

I don't have a modem yet, but will be getting 1 very soon. I am on Verizon wireless, do you have any reccomendations? Just looked on their website and saw a Verizon 4gLTE usb modem UML295, Pantech UML290, and a Verizon 551L.