Our experience of Digital Voice server construction with Raspberry Pi Zero

Transcription

1 Our experience of Digital Voice server construction with Raspberry Pi Zero Shu JA3GQJ/JL3ZII Introduction There are many ways to use the reflector function of the D - Star system, but even beginners like me, there are two ways to use the reflector in a relatively easy way. I recorded the experience built based on this. The method of this URL uses ThumbDV (left figure below) and Raspberry Pi 3 etc, but this time we used Raspberry Pi Zero (right figure below) instead of Raspberry Pi 3. With this, it is now possible to use the reflector use of android cell-phone or personal computer from anywhere Compass is used for OS of Raspberry Pi Zero After downloading the largest volume (1.7 G) zip file with the newest date from the following URL, use the free software called Win32 DiskImager on the Windows PC to write the OS image file to the SD card. SD card uses 8GB of class If you are troublesome and difficult to understand such as writing procedure for image file of OS, we can help you by remote control if you install TeamViewer on Windows PC. If you are available Skype, you can write the SD card yourself while watching the screen of our computer. 2.Start to run Raspberry Pi Zero Next, put the written SD card to Raspberry Pi Zero, start Raspberry Pi Zero with HDMI monitor, USB keyboard and mouse. The following GUI screen is displayed on the monitor. Also make an Internet connection referring to the method of setting the wireless LAN on the Appendix at the end of the book. You can see the web page with the web browser included with the OS in this state but here it is not the purpose. It is necessary to publish the Raspberry Pi Zero to be able to connect to Raspberry Pi Zero from the outside (other than home). For that, we will fix the IP address. People who have the experience of opening a homepage know that. GUI Screen of Raspberry Pi Zero Since there is only one USB terminal in Raspberry Pi Zero, it becomes wiring as shown below when initial setting is done. It will be as simple as shown at the end of the initial setting. 1

2 Raspberry Pi Zero 2 Power sorce 4 3 USB terminal MHDIterminal 5 ThumbDV 6 USB hub 7 Mouse 8 Key board 9 Wireless LAN adapter Wiring when starting Raspberry Pi Zero for the first time Fix the local IP address In order to identify Raspberry Pi Zero that the router at home is connected to the LAN as a promise of the Internet, local IP addresses are automatically assigned as xxx, xxx, xxx and so. This address is said to be the local IP address and the number xxx changes depending on the case. When viewing the Internet web page from home, there is no problem even if this address changes. However, when try to recognizing a specific Raspberry Pi Zero from the outside, if this local IP address changes this Raspberry Pi Zero can not be identified. So you need to fix the local IP address assigned automatically. We will confirm the automatically assigned local IP address using software such as Network Scanner (for Android smartphone), Advanced IP Scanner (Windows PC) etc. and then fix it. The IP address that is automatically assigned depends on the router you use, such as xxx, xxx, xxx, and so on. About editor pico Since editor is necessary after this, use pico attached to Raspberry Pi. Type pico /xx/xx.yy, etc. in the terminal emulator "Terminal". To move the cursor, you need to use the up, down, left and right arrows on the keyboard, but the others are OK with keyboard operation like Windows PC. To save after editing or new creation, press the control key and "x" key at the same time, enter "y" and exit with the enter key. How to open the terminal emulator Terminal Click here to open IP address fixing method In the terminal emulator Terminal of Raspberry Pi Zero, fix the assigned local IP address using the following command. (Example in the case of ) 2

3 pico /etc/dhcpcd.conf Confirm ThumbDV recognition Next, Attach ThumbDV to the Raspberry Pi zero USB hub and put the command "ls / dev / ttyu *" then It is normal state if "/ dev / ttyusb 0" is displayed. 3. Install server software Install AMBEserver (Digital Voice Server Software) by sequentially entering the following command (excluding #) in the terminal emulator "Terminal" of Raspberry Pi Zero. # apt-get update -y # apt-get upgrade -y # apt-get install ambeserver -y # systemctl enable ambeserver@ttyusb0.service An example of entering the command apt-get update-y Be sure to enter "sudo - s" and "cd" sequentially before entering the command as in the example in the figure above and keep it in the state of compass: ~ #". In the terminal emulator Terminal of Raspberry Pi Zero, enter the next command (excluding #) sequentially, then set the configuration file. 3

4 # cd /etc/opendv (Change the directory to / etc / opendv.) # cp ambeserver-ttyusb0.conf ambeserver-ttyusb1.conf (Copy ambeserver-ttyusb0.conf as ambeserver-ttyusb1.conf.) # pico /etc/opendv/ambeserver-ttyusb0.conf (Open the configuration file named ambeserver-ttyusb0.conf with the editor pico.) (A terminal emulator Terminal which sequentially inputs the above commands) Add "-s " to the opened /etc/opendv/ambeserver-ttyusb0.conf configuration file (like the red circle in the figure below). (Contents of /etc/opendv/ambeserver-ttyusb0.conf file) Start the digital audio server (AMBEserver) with the following command. If it is normal, there is no screen change. You can see just command prompt. # systemctl start ambeserver@ttyusb0.service (Normal Terminal screen sate after sever start to run) 4. Confirm operating status of digital voice server Originally, we will check the operation of the server here, but we omit it because it is troublesome work for beginner. The verification method is described in detail in Appendix at the end of the volume. 5. Make the digital voice server available from the outside If you obtain a global IP on a site that provides free global IP and you publish the digital voice server to the outside, you will be able to access the digital voice server with your android cell phone from anywhere outside. Refer to the end of this document for free global IP acquisition methods in Japan. 6. Software to use digital voice server 4

5 6.1 BlueDV AMBE for android It is a software developed by PA7LIM David of the Netherlands to use digital voice server with Android smartphone. You can download the software from Googl Play. It works comfortably with Android version "4.x. x" and above. Configuration The following is a picture of the setting procedure on the android cellphone. Touch "Setting" in 1 and enter necessary items in order 2, 3, 4, 5. For "Device" in 3, select AMBESERVER from the pull down menu. The important thing in 5 is "AMBEServ IP". Enter the global IP address you got at the provider here. When all the items are ntered, touch "Save" in 5. The setting screen of the cellphone consists of 2, 4, 5. 3 is just a screen showing the Device selection method Refer to " for detailed operation method Screen after setting is completed Connect to server with "CON" button ON 5

6 Connect to XRF 569 with handset icon button ON Reception status Send on screen tap Gain adjustment with AMBE button Receive record display with reception history button Server side problem 6.2 BlueDV for Windows Download BlueDV pre BETA.zip from This software is developed by PA7LIM David of the Netherlands to use a digital voice server on Windows PC. The figure below shows the setting when using a digital voice server with a personal computer. Pay attention to the circle mark. Check "Use AMBEServe" and enter the local IP address of the server to be used in the Host / IP field, the setting is over. Refer to the pdf file that summarizes the experiences of using this software at 6

7 Do not hesitate to contact us by to the contact address at the end of the book if you are unsure of how to set it. "Connected to AMBEserver" appears in "Status" when connecting correctly to the server If the server is faulty, the "Status" will show "Reconnecting AMBEserver" Lineup after initial setting 1. In case of Raspberry Pi Zero(USB hub can be two terminals) 2.In the case of Raspberry Pi Zero W it gets even simpler 7

8 Contact address We are summarizing experience stories to the extent that we understand software etc with so-called amateur eyes, not professional such as programming language. Please contact us by to We will answer your inquiries with an amateur idea. If you have TeamViewer or Skype, we can explain it further easily, so we recommend you use these. 8 As of September 10, 2018

9 APPENDIX 1.How to obtain global IP address When you visit the following page opens. Then click "New User Registration" on the right side of the screen. Next, Carefully read the notes on the next page to open and click the normal connection on the second line of usage registration. Next, if you decide your favorite user name ("hamradio" in this example), and select your domain name ("dip.jp" in this example) from the pull-down menu, enter your address, then you click the "register" button to finish. 9

10 Then the following screen will be displayed. In this example, XXX.YY is the global IP. Note this and use it in the setting of the cellphone. 2. How to connect Raspberry Pi via LAN There are two ways to connect to the LAN, either wired or wireless. In the case of Raspberry Pi Zero, an adapter is required regardless of wired or wireless connection. Raspberry Pi Zero W comes with wireless LAN function. Here we summarize the circumstances that we set up when using the wireless LAN adapter for Raspberry Pi Zero. 10

11 3.How to check the operating status of the digital voice server If you download the "ambesocketest.py" file from following URL to the directory "/ etc / opendv" then you can check the operation state of the sever. (registration required) Contents of the above screen (You can create this file in the directory "/ etc / opendv" with the file name ambesocketest.py" in the editor and execute it.) import socket #for sockets 11

12 import sys #for exit # create dgram udp socket try: s = socket.socket(socket.af_inet, socket.sock_dgram) except socket.error: print 'Failed to create socket' sys.exit() # host = 'localhost'; host = ' '; port = 2460; while(1) : getprodid = bytearray.fromhex(" ") try : #Set the whole string s.sendto(getprodid, (host, port)) # receive data from client (data, addr) d = s.recvfrom(1024) reply = d[0] addr = d[1] print 'Server reply : ' + reply except socket.error, msg: print 'Error Code : ' + str(msg[0]) + ' Message ' + msg[1] sys.exit() Enter the command as follows. root@compass:/home/pi# cd /etc/opendv/ Change directory to "/ etc / opendv /" root@compass:/etc/opendv# python ambesocketest.py Execute the downloaded file As a result of execution, the next letter should be displayed repeatedly. Server reply : a 0AMBE3000R Finish the display with "Ctrl - C". (Above chart) 12

13 ^CTraceback (most recent call last): File "ambesocketest.py", line 23, in <module> d = s.recvfrom(1024) KeyboardInterrupt that's all 13