Tessel 2 Command Line Interface

Installation

Prerequisites for installation: Node.js 4.2.x or greater

npm install -g t2-cli

The best place to go next is the Tessel 2 start experience, which will walk you through a tutorial.

Updating Tessel 2 On-board OS/Firmware

How do I know if I need to update my T2?

The easiest way is to run t2 update and it will update automatically if there is a newer firmware version available. Otherwise, you can run t2 version to get the version running on your Tessel, and then t2 update -l to see the 10 newest versions available.

Updating

Simply run t2 update. If you want to update to a specific version, run t2 update -v VERSION_NUM where VERSION_NUM is one of the versions returned by t2 update -l (like t2 update -v 0.0.6).

Setup

USB

Connecting to a Tessel 2 over USB requires no special setup.

LAN

In order to authorize the device with your computer to work over a LAN connection, call t2 provision after connecting it via USB. This will place an SSH key on the device. Use the t2 wifi command as described below to connect Tessel 2 to a local network. You should now be able to access your Tessel 2 remotely.

SSH

To connect to your Tessel 2 over SSH use the t2 root command. Before you connect, call t2 provision to authorize your computer to access your Tessel via SSH.

Usage

  • t2 root
    • [--timeout] Set timeout in seconds for scanning networked Tessels. The default is 5 seconds.
    • [--key] SSH key for authorization with your Tessel. Optional, only required if you have changed the keypath after your Tessel was provisioned.
    • [--name] The name of the Tessel where the command will be executed.
    • [--output] Enable or disable writing command output to stdout/stderr. Useful for CLI API consumers. Set to true by default
    • [--loglevel] Set the loglevel. It is set to basic by default. Available options are 'trace', 'debug', 'basic', 'info', 'http', 'warn', 'error'

Virtual Machine

Check out the Virtual Machine repo for instructions on how to set up the VM. All CLI commands except provision and wifi should be functional with the VM.

Usage

Specify which Tessel to use with the --name <name> option appended to any command. If --name is not specified, CLI will look for an environment variable, e.g. export TESSEL=Bulbasaur. If none of the above are specified and there is one Tessel connected over USB, this Tessel will be preferred. Finally, if there is only one Tessel available and none of the above are specified, CLI will choose that Tessel.

Starting Projects

  • t2 init in the current directory, create a package.json and index.js with Hello World code.

Project Files

Along with the package.json and index.js included in the t2 init process, there are some other files that may be useful for your project:

  • .tesselignore similar to .gitignore or .npmignore, this file should list any files or directories you want ignored by the T2 bundling and deployment process. This is handy when using the --full flag, which tells T2 to bundle everything in the project directory.
  • .tesselinclude the overriding and opposite behavior of .tesselignore, this file should list any files or directories you want included with the T2 bundling and deployment process. This is handy for including non-JavaScript assets, like HTML, CSS, and images, for use within your project.
    • In your JavaScript program, assets listed in the .tesselinclude file should always be accessed using __dirname (read more about __dirname in the Node.js docs). For example, if there is a file at public/index.html and it's listed in your .tesselinclude, from your JavaScript program, you'd read it like this: fs.readFile(path.join(__dirname, "public/index.html"), "utf8", (error, contents) => ...);.

Tessel Management

  • t2 provision will authorize your computer to access a Tessel over SSH. (USB-connected Tessel only)
  • t2 list will show what Tessels are available over WiFi and USB.
  • t2 rename will change the name of a Tessel.
  • t2 reboot will reboot your Tessel.
  • t2 key will generate a local SSH keypair for authenticating to a Tessel. Use with the generate argument to generate a new local SSH keypair for authenticating to a Tessel.

Code Deployment

During code deployment, CLI looks for .tesselignore and .tesselinclude files to let it know which files it should bundle up and push over to Tessel. In the default bundling process, CLI takes the file passed into the run or push command and uses it as an entry point to build a dependency graph (similar to Browserify). Once the dependencies are known, binary modules are replaced by pre-compiled (for mips) binaries, assets are copied, and everything is tarred before sent to the awaiting Tessel.

  • t2 run <file> copy the file and its dependencies into Tessel's RAM & run immediately. Use this during development of your device application.
    • [--lan] deploy over LAN connection
    • [--usb] deploy over USB connection
    • [--slim] true by default, copy only files needed by the program to run
    • [--full] the opposite of --slim, copy all the files in the project directory
  • t2 push <file> copy the file and its dependencies into Tessel's Flash memory & run immediately. Once deployed with push command, the device application will automatically run every time the Tessel restarts.
    • [--lan] deploy over LAN connection
    • [--usb] deploy over USB connection
    • [--slim] true by default, copy only files needed by the program to run
    • [--full] the opposite of --slim, copy all the files in the project directory
  • t2 erase erase any code pushed using the t2 push command

Using Wifi

  • t2 wifi show details about an existing WiFi connection
    • [-l] lists the available networks
    • [-n SSID] required, connects to the provided SSID
    • [-p PASS] optional, connects with the given password
    • [-s SECURITY] connects with the given security type, valid options:
      • none open network, no need for a password
      • wep WEP network, password required
      • psk WPA Personal, password required
      • psk2 WPA2 Personal, password required
      • wpa WPA Enterprise, password required
      • wpa2 WPA2 Enterprise, password required
    • [--off] disconnects from the current network
    • [--on] connects to the last configured network

Create An Access Point

  • t2 ap
    • [-n SSID] required, creates a network with the given ssid
    • [-p PASS] optional for open networks, creates a network with the given password
    • [-s SECURITY] creates a network with the given security, valid options:
      • none open network, default if no password is given
      • wep WEP network, password required
      • psk WPA Personal, password required
      • psk2 WPA2 Personal, reccomended, password required & default if password is given without security
    • [--off] turn off the current access point
    • [--on] turn on the most recently used access point

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