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The Twilio CLI Microvisor Plugin

Microvisor Private Beta

Microvisor is in a pre-release phase and the information contained in this document is therefore provisional and subject to change. Some features referenced below may not yet be available in or supported by the current version of the Microvisor system calls or REST API.

Current version: 0.3.0

This utility adds Microvisor-oriented functionality to the Twilio CLI tool.



The Microvisor plugin requires Twilio CLI. You can find full instructions for your platform in the Twilio CLI Quickstart guide.

Install the plugin

Run the following command:

twilio plugins:install @twilio/plugin-microvisor

Installing the plugin may result in a number of warnings being output by the installer. We are working to address this.

Update the plugin

After installation, you can keep the plugin up to date by running:

twilio plugins:update

We expect to make a number of improvements to the plugin as Microvisor continues through its pre-release phases and moves toward General Availability. We strongly recommend that you keep your installed plugin updated by running the command shown above regularly.


The plugin operates with commands and sub-commands, separated by colons, and entered this way:

twilio microvisor:<COMMAND>:<SUB_COMMAND>

The plugin provides the following commands:

  • logs — View messages streamed from a Microvisor-enabled device.
  • debug — Enable the decryption of remote debugging signals from a Microvisor-enabled device.


The logs command provides the following sub-commands:

  • stream — Initiate log streaming. It takes as its argument a device SID — the Microvisor-enabled device from which you wish to receive log messages:
    twilio microvisor:logs:stream $MV_DEVICE_SID

    If you specify a device that isn’t associated with your account, an Unknown device SID error will be thrown.

    Your call may also include the --output flag, which is used to output log messages either in plain text (the default) or in JSON format:
    twilio microvisor:logs:stream $MV_DEVICE_SID --output=json​

    If you select JSON output, you can pipe the output of the command through the JQ utility to present the JSON in a more reader-friendly form:

    twilio microvisor:logs:stream $MV_DEVICE_SID --output=json​ | jq

    The contents of the JSON payload are described below. The plain text output is the value of a message object’s message property.


The debug command has no sub-commands. It takes a device SID and a path to a remote debugging private key as its arguments. For more information on why this key is required and how it is generated, please see Microvisor Remote Debugging.

twilio microvisor:debug $MV_DEVICE_SID </path/to/your/private/key.pem>

Your call may also include the --listen-port flag, which is used to select the port through which debugging data will flow.

twilio microvisor:debug $MV_DEVICE_SID </path/to/your/private/key.pem> \

The default port is 8001. If you specify an alternative port number, you will need to update your .gdbinit file or run the command

target remote localhost:<PORT_NUMBER>

within gdb.

The properties included in the log messages output as JSON is still being defined and is therefore subject to change. You should not build against the following description, which is intended for information purposes only.

You can optionally set the log:stream command to output log messages in their source form, which is JSON. The default output mode emits the value of one of the JSON’s properties, message. The other properties can be accessed by adding --output=json to the command.

Property Name Value(s) Notes
category connection Device-cloud connection status
app_logging Application logging messages
message Text The exact message depends on the value of category. App logging values are the text issued by the application using mvServerLog(). Connection messages indicate connection status updates
timestamp A Unix timestamp The date and time at which the message was emitted by Twilio


0.3.0 July 29, 2022

  • Support Microvisor application logging system calls.

0.2.0 May 24, 2022

  • Support Microvisor remote debugging with debug command.
  • Use end-to-end encryption for remote debugging sessions. BREAKING CHANGE

0.1.0-0.1.2 April 27, 2022

  • Initial release and follow-up bug-fixes.
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