Stealth Bandwidth SMS

Compatibility

⚠️ Version 2.0 is only compatible with Stealth 3.0 (Pull Request 420). ⚠️

While Stealth V2 was a standalone Ruby application, Stealth V3 is a mounted engine within an existing Ruby on Rails application.

Installation

In your Rails app, add the stealth and stealth-bandwidth gems:

gem 'stealth', git: 'https://github.com/hellostealth/stealth.git', branch: '3.0-mountable'
gem 'stealth-bandwidth'

Configurations

Create a Bandwidth Messaging App, and set up the webhook URL to point to your ngrok that forwards requests to your Rails app. You must append /stealth/<service>.

For example:

https://abc1234.ngrok.io/stealth/bandwidth

Reply Types

Flow-based Replies

Inline replies can be created by calling the say method within Stealth.flow

Stealth.flow :hello do
  state :say_hello do
    say "Hello world!"
  end
end

You can use the send_replies method within Stealth.flow to define the reply in Stealth.reply

stealth/flows/hello_flow.rb

Stealth.flow :hello do
  state :say_hello do
    send_replies
  end
end

stealth/replies/hello/say_hello.rb

Stealth.reply :hello do
  state :say_hello do
    say "Hello world!"
  end
end

☝️ We recommend using the send_replies method, when replies are more complex and that you want to keep your Stealth.flow dry. Note: To follow naming conventions, in the stealth/replies directory, you must create a subdirectory that matches the flow name, and inside it, a file named after the state name.

Suggestions

Though suggestions are not a reply type on their own, they enhance the visual presentation of SMS replies by adding line breaks and formatting options as separate choices.

Stealth.flow :animal do
  state :ask_if_like_dogs do
    say("Do you like dogs?", suggestions: ["Yes", "No"])
    update_session_to state: :get_if_like_dogs
  end

  state :get_if_like_dogs do
    handle_message(
      yes: proc { say("Woof") },
      no: proc { say("Too bad...") }
    )
    step_to state: :ask_favorite_animal
  end

  state :ask_favorite_animal do
    say("What's your favorite animal?", suggestions: ["Cat", "Dog", "Sloth"])
    update_session_to state: :get_favorite_animal
  end

  state :get_favorite_animal do
    translated_msg = get_match(
      ['Cat', 'Dog', 'Sloth'], raise_on_mismatch: true
    )
    say("I like #{translated_msg} too!")
  end
end

Delays

Delays introduce pauses between text replies, improving user experience.

Stealth.reply do
  say "Hello"
  say(reply_type: "delay", duration: "dynamic")
  say "How are you?"
  say(reply_type: "delay", duration: 2)
end

The duration can be a floating point value (in seconds) or dynamic, where the system automatically determines the delay.

To enable automatic delays globally:

Stealth.config.auto_insert_delays

Sending Media

Bandwidth supports various MMS file types. For more details, refer to: Bandwidth Supported MMS File Types

You must use a valid URL where the file is hosted.

Images

Stealth.reply do
  say(
    "Here's an image.",
    reply_type: "image",
    image_url: "https://example.org/image.png"
  )
end

Videos

Stealth.reply do
  say(
    "Here's a video.",
    reply_type: "video",
    video_url: "https://example.org/cool_video.mp4"
  )
end

Audio

Stealth.reply do
  say(
    "Here's an audio.",
    reply_type: "audio",
    audio_url: "https://example.org/podcast.mp3"
  )
end

Files

Stealth.reply do
  say(
    "Here's a PDF file.",
    reply_type: "file",
    file_url: "https://example.org/some.pdf"
  )
end