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76 lines
2.8 KiB
76 lines
2.8 KiB
# connect to a comma 3/3X
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A comma 3/3X is a normal [Linux](https://github.com/commaai/agnos-builder) computer that exposes [SSH](https://wiki.archlinux.org/title/Secure_Shell) and a [serial console](https://wiki.archlinux.org/title/Working_with_the_serial_console).
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## Serial Console
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On both the comma three and 3X, the serial console is accessible from the main OBD-C port.
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Connect the comma 3/3X to your computer with a normal USB C cable, or use a [comma serial](https://comma.ai/shop/comma-serial) for steady 12V power.
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On the comma three, the serial console is exposed through a UART-to-USB chip, and `tools/serial/connect.sh` can be used to connect.
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On the comma 3X, the serial console is accessible through the [panda](https://github.com/commaai/panda) using the `panda/tests/som_debug.sh` script.
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## SSH
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In order to SSH into your device, you'll need a GitHub account with SSH keys. See this [GitHub article](https://docs.github.com/en/github/authenticating-to-github/connecting-to-github-with-ssh) for getting your account setup with SSH keys.
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* Enable SSH in your device's settings
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* Enter your GitHub username in the device's settings
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* Connect to your device
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* Username: `comma`
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* Port: `22`
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Here's an example command for connecting to your device using its tethered connection:<br />
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`ssh comma@192.168.43.1`
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For doing development work on device, it's recommended to use [SSH agent forwarding](https://docs.github.com/en/developers/overview/using-ssh-agent-forwarding).
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### Notes
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The public keys are only fetched from your GitHub account once. In order to update your device's authorized keys, you'll need to re-enter your GitHub username.
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The `id_rsa` key in this directory only works while your device is in the setup state with no software installed. After installation, that default key will be removed.
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#### ssh.comma.ai proxy
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With a [comma prime subscription](https://comma.ai/connect), you can SSH into your comma device from anywhere.
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With the below SSH configuration, you can type `ssh comma-{dongleid}` to connect to your device through `ssh.comma.ai`.
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```
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Host comma-*
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Port 22
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User comma
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IdentityFile ~/.ssh/my_github_key
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ProxyCommand ssh %h@ssh.comma.ai -W %h:%p
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Host ssh.comma.ai
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Hostname ssh.comma.ai
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Port 22
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IdentityFile ~/.ssh/my_github_key
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```
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## One-off connection
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```
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ssh -i ~/.ssh/my_github_key -o ProxyCommand="ssh -i ~/.ssh/my_github_key -W %h:%p -p %p %h@ssh.comma.ai" comma@ffffffffffffffff
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```
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(Replace `ffffffffffffffff` with your dongle_id)
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## ssh.comma.ai host key fingerprint
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```
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Host key fingerprint is SHA256:X22GOmfjGb9J04IA2+egtdaJ7vW9Fbtmpz9/x8/W1X4
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+---[RSA 4096]----+
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| . |
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| + o |
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| S = + +..|
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| + @ = .=|
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| . B @ ++=|
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| o * B XE|
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| .o o OB/|
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+----[SHA256]-----+
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```
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