guides:virtual_modem:section_4
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guides:virtual_modem:section_4 [2019-12-11 16:37] omolini [Initial VModem testing] |
guides:virtual_modem:section_4 [2020-02-19 02:10] omolini [Skip to other sections] |
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| * **/boot/vmodem/1.sh** | * **/boot/vmodem/1.sh** | ||
| * **/boot/vmodem/ppp.sh** | * **/boot/vmodem/ppp.sh** | ||
| + | |||
| + | * Make sure they are executable: | ||
| + | <code bash> | ||
| + | chmod 770 /boot/vmodem/vmodem.sh | ||
| + | chmod 770 /boot/vmodem/1.sh | ||
| + | chmod 770 /boot/vmodem/ppp.sh | ||
| + | </code> | ||
| ==== Name of the serial port ==== | ==== Name of the serial port ==== | ||
| Line 50: | Line 57: | ||
| * Make sure you set the appropriate serial speed settings on the terminal program before you connect (by default VModem is set to operate at 57600 bps). | * Make sure you set the appropriate serial speed settings on the terminal program before you connect (by default VModem is set to operate at 57600 bps). | ||
| * Connect with the terminal program to the Raspberry Pi. | * Connect with the terminal program to the Raspberry Pi. | ||
| - | * Over SSH, on the Raspberry, issue the following commands. | + | * Open up PuTTY (or your other SSH client of choice) and connect over SSH to the Raspberry Pi. Issue the following commands. |
| <code bash> | <code bash> | ||
| cd /boot/vmodem | cd /boot/vmodem | ||
| Line 58: | Line 65: | ||
| * If you see the READY text on the screen, the script is ready to accept connections. | * If you see the READY text on the screen, the script is ready to accept connections. | ||
| * To exit VModem and return you back to shell, you can press **CTRL + z** | * To exit VModem and return you back to shell, you can press **CTRL + z** | ||
| - | * The script emulates a few basic Hayes commands, so you should be able to issue the AT command on the terminal. Type "AT" and then press ENTER. You should receive an "OK" response. If you do not, you may need to press sync up the connection by pressing ENTER a couple of times. | + | * The script emulates a few basic Hayes commands, so you should be able to issue the AT command on the terminal. Type "AT" and then press ENTER. You should receive an "OK" response. If you do not, you may need to sync up the connection by pressing ENTER a couple of times. If you still do not receive a response, something may be wrong with the serial settings, or with the connection to the Raspberry Pi. Also check to see that the vmodem.sh script is running. If it is, it should echo your input on the serial terminal to the script's output. |
| * On a serial terminal, this is the output you should be getting: | * On a serial terminal, this is the output you should be getting: | ||
| {{ :guides:pics:vmodem_hyperterm.png?600 |}} | {{ :guides:pics:vmodem_hyperterm.png?600 |}} | ||
| * Over on the Raspberry Pi, you should be seeing the corresponding output: | * Over on the Raspberry Pi, you should be seeing the corresponding output: | ||
| {{ :guides:pics:vmodem_putty2.png |}} | {{ :guides:pics:vmodem_putty2.png |}} | ||
| - | * If you get any error messages, take a note of them and look for commonalities in any steps you've taken before this step. Open up the script vmodem.sh for editing to make sure the baud and serial port are properly set. If you're unable to figure it out, feel free to contact me (see bottom of page). | ||
| ===== Getting online ===== | ===== Getting online ===== | ||
| Line 76: | Line 82: | ||
| ===== Making Virtual Modem run at startup ===== | ===== Making Virtual Modem run at startup ===== | ||
| - | After you **have verified** that the VModem works properly on the console (see previous section), and you are able to connect to the Internet, you can make VModem run automatically as a background process after the Raspberry Pi is powered on. | + | After you have **verified** that the VModem works properly on the console, and you have tested that you are able to connect to your network, you can make VModem run automatically as a background process after the Raspberry Pi is powered on. It will run as a background process so you won't see it's output, so it's highly recommended to thoroughly test the script first. |
| - | There are two ways you can do this: | + | * Edit the /etc/rc.local file. Make sure your /etc/rc.local has the following at the bottom: |
| - | + | ||
| - | **1)** You can either run the following command which will automatically add VModem to your /etc/rc.local: | + | |
| - | <code bash> | + | |
| - | sudo sh -c 'printf "`head -n -1 /etc/rc.local`\n\ncd /boot/vmodem\n./vmodem.sh &\n\nexit 0\n" >/etc/rc.local' | + | |
| - | </code> | + | |
| - | + | ||
| - | **2)** Or you can edit your rc.local manually. Make sure your /etc/rc.local has the following at the bottom: | + | |
| <code bash> | <code bash> | ||
| # Start serial port and simulate a modem | # Start serial port and simulate a modem | ||
| Line 91: | Line 90: | ||
| /boot/vmodem/vmodem.sh & | /boot/vmodem/vmodem.sh & | ||
| exit 0 | exit 0 | ||
| + | </code> | ||
| + | |||
| + | * You can alternatively run the following command on the Raspberry Pi shell which will do the appropriate changes for you: | ||
| + | <code bash> | ||
| + | sudo sh -c 'printf "`head -n -1 /etc/rc.local`\n\ncd /boot/vmodem\n./vmodem.sh &\n\nexit 0\n" >/etc/rc.local' | ||
| </code> | </code> | ||
| Line 105: | Line 109: | ||
| * [[Guides:Connecting a Dumb/Smart Terminal to the Internet]] | COMING SOON | * [[Guides:Connecting a Dumb/Smart Terminal to the Internet]] | COMING SOON | ||
| - | ==== Skip to other sections ==== | + | ===== Troubleshooting ===== |
| + | |||
| + | * Some computers are not capable of operating at fast serial speeds. If you're unable to connect at 57600 or faster, try slower speeds, such as 9600 baud at first. Adjust both the vmodem.sh script and the computer to connect at only 9600 baud. If that works, work your way up to see where the limit for your specific computer is. | ||
| + | * If you run into any other issues, take a note of them and look for commonalities in any steps you've taken before this step. Open up the script vmodem.sh for editing to make sure the baud and serial port are properly set. If you're unable to figure it out, feel free to contact me (see bottom of page). | ||
| + | |||
| + | ==== Skip to previous sections ==== | ||
| * [[Guides:Virtual Modem|Section 1 - Introduction]] | * [[Guides:Virtual Modem|Section 1 - Introduction]] | ||
guides/virtual_modem/section_4.txt · Last modified: 2023-11-24 23:16 by omolini
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