Release 260111

2026-01-11 18:23:29 +08:00
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+# connect to a comma 3/3X
+
+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).
+
+## Serial Console
+
+On both the comma three and 3X, the serial console is accessible from the main OBD-C port.
+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.
+
+On the comma three, the serial console is exposed through a UART-to-USB chip, and `tools/scripts/serial.sh` can be used to connect.
+
+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.
+
+  * Username: `comma`
+  * Password: `comma`
+
+## SSH
+
+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.
+
+* Enable SSH in your device's settings
+* Enter your GitHub username in the device's settings
+* Connect to your device
+    * Username: `comma`
+    * Port: `22`
+
+Here's an example command for connecting to your device using its tethered connection:<br />
+`ssh comma@192.168.43.1`
+
+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).
+
+
+## ADB
+
+In order to use ADB on your device, you'll need to enable it in the device's settings.
+
+* Enable ADB in your device's settings
+* Connect to your device
+    * `adb shell` over USB
+    * `adb connect` over WiFi
+    * Here's an example command for connecting to your device using its tethered connection: `adb connect 192.168.43.1:5555`
+
+> [!NOTE]
+> The default port for ADB is 5555 on the comma 3/3X.
+
+For more info on ADB, see the [Android Debug Bridge (ADB) documentation](https://developer.android.com/tools/adb).
+
+### Notes
+
+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.
+
+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.
+
+#### ssh.comma.ai proxy
+
+With a [comma prime subscription](https://comma.ai/connect), you can SSH into your comma device from anywhere.
+
+With the below SSH configuration, you can type `ssh comma-{dongleid}` to connect to your device through `ssh.comma.ai`.
+
+```
+Host comma-*
+  Port 22
+  User comma
+  IdentityFile ~/.ssh/my_github_key
+  ProxyCommand ssh %h@ssh.comma.ai -W %h:%p
+
+Host ssh.comma.ai
+  Hostname ssh.comma.ai
+  Port 22
+  IdentityFile ~/.ssh/my_github_key
+```
+
+### One-off connection
+
+```
+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
+```
+(Replace `ffffffffffffffff` with your dongle_id)
+
+### ssh.comma.ai host key fingerprint
+
+```
+Host key fingerprint is SHA256:X22GOmfjGb9J04IA2+egtdaJ7vW9Fbtmpz9/x8/W1X4
+---[RSA 4096]----+
+|                 |
+|                 |
+|        .        |
+|         +   o   |
+|        S = + +..|
+|         + @ = .=|
+|        . B @ ++=|
+|         o * B XE|
+|         .o o OB/|
+----[SHA256]-----+
+```