A comma 3/3X is a normal Linux computer that exposes SSH and a 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 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 using the panda/tests/som_debug.sh
script.
In order to SSH into your device, you'll need a GitHub account with SSH keys. See this GitHub article for getting your account setup with SSH keys.
comma
22
Here's an example command for connecting to your device using its tethered connection:
ssh comma@192.168.43.1
For doing development work on device, it's recommended to use SSH agent forwarding.
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.
With a comma prime subscription, 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
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)
Host key fingerprint is SHA256:X22GOmfjGb9J04IA2+egtdaJ7vW9Fbtmpz9/x8/W1X4
+---[RSA 4096]----+
| |
| |
| . |
| + o |
| S = + +..|
| + @ = .=|
| . B @ ++=|
| o * B XE|
| .o o OB/|
+----[SHA256]-----+