Signal Messenger Add-On + NodeRed

Lewis · March 10, 2024, 6:18am

Signal Messenger Add-On

The How-To Explanation that I never found anywhere else

So, you want to integrate a Signal Messenger account into your Home Assistant instance, and you got to the point where you could send, but not receive, or were entirely disappointed with the lag and how slow it is.

Read on!

Signal Messenger Add-On

The instructions are simple and easy to follow. But don’t do it!

Skip ahead to the Signal CLI REST API installation instructions.

Once you have the Signal Messenger Add-On installed, go into the Configuration.

Choose the mode: json-rpc.

Toggle OFF Auto_Receive

Change the External Port number if necessary. My instance is already using 8080 somewhere else. So I changed the Signal Docker port to 7465. (That’s SGNL on a touchtone phone.)

Go to Info and Start the Signal Messenger Add-On.

Have a look at the Log on Start Up. It should look like this:

The next few steps are required to associate your Signal Add-On with a phone number. This can be a totally new number on Signal (probably the best option), or it can be an existing number (that will be shared with your phone). The downside of linking your HA Signal is that you would just be sending messages to yourself.

The instructions are straight forward and have all the necessary steps in detail, should you run into issues. Do all of these from a Terminal, and remember to use the IP of your HA Instance (the external IP, or hostname/domain name), and the port number you defined in the configuration.

Once you have successfully registered your HA with Signal and have completed some of the preliminary checks, and the logs are not throwing any 400 or 404 errors.

Lucky for you, I have Noded out a full Signal CLI REST API Flow for you to import. It’s fully Commented and will provide most of the commands listed. Some of the API calls just didn’t succeed, and I don’t know why. But it’s not really a problem because the main functions of sending and receiving should be working.

The most important piece of information that is not at all mentioned in the official documentations found on HA or the Signal CLI REST API, or the Signal-CLI githubs is this: when in json-rpc mode, all interactions with the Add-On are sent by HTTP, with the exception of RECEIVING MESSAGES, which is available only on a WebSocket connection.

In modes “normal” or “native”, sending and receiving are often delayed and quite sluggish, as the engine spins up for each service call. But in json-rpc mode, the receiving of messages is through the always-on always-connected WebSocket.

After importing the Flow into your NodeRed, be sure to add the REQUIRED Global Env Variables; these are used throughout the Nodes in the Flow.

Also be sure to edit the WebSocket Node in the Messages group to reflect your Signal resource, port, and Signal Phone Number.

When you are using Terminal to do the initial setup, it will be to your HA external IP.

However, when NodeRed is communicating with Signal, on http:// REST API calls or on the ws:// WebSocket, this is all happening inside the Docker network in HA. Therefore the URL in NodeRed is the hostname of the Signal Docker. This is viewable on the Info tab of the add-on.

Even if you have set a different port for Signal, the internal network of Docker maintains the default port of 8080 for communicating with the Signal Messenger host.

Once you’ve come this far… Just start with sending and receiving messages and watching the debug. You should be able to expand the json objects and locate the paths with which you will build your automations and notifications in NodeRed.

The Flow is too long for a single post. I will post it in two replies.

Lewis · March 10, 2024, 3:56pm

This is Part 1 of the Flow

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Lewis · March 10, 2024, 3:57pm

This is Part Two of the Flow
Combine them in order in a json file and import to NodeRed

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over60 · April 22, 2024, 9:06am

Hi Lewis, a beginners question… REQUIRED: Define Global Environmental Variables: “signal_url” = “http://1315902c-signal-messenger:8080”, “signal_num” = {{your registered Signal phone number}}… where to define… can i have a sample ?

Lewis · April 22, 2024, 7:48pm

When in the Node-RED dashboard, click on the hamburger menu in the upper right, then click on Settings.

In the pop-up window there are four stacked tabs on the left side, View, Palette, Keyboard, Environment

Select Environment

Add key value (str) pairs to match what I’ve entered in the comment bubbles.

Lewis · May 31, 2024, 2:14pm

Start here:

Signal for HA on GitHub

Follow the installation instructions.

LDD01 · May 31, 2024, 2:51pm

Hi Lewis,
yes, thank you
Part 1 is working now.
1.- added in REPOSITORIE: the URL: GitHub - haberda/hassio_addons: hopefully useful hassio addons
then i can see the add-on Signal-Messenger

LDD01 · May 31, 2024, 3:40pm

Hi Lewis,
when i correct you understand,
i set the value in “Environment”
Now how can do a basic test that i received the message?

LDD01 · May 31, 2024, 4:03pm

Hi Lewis,
i add the configuration for notify.signal and tried a test, but i don’t receive again anything
Any suggestion for me?

SORRY, i cannot more add new reply. - i reached the limit

Hi Lewis,
thank you very much for your quickly reply.
when you wrote: Use the inject nodes to send yourself a message, and then reply to that message from your phone. → i need to add a new “inject nodes” in CANVAS and configure my phone number OR i need to use a specific “inject node” that already are in CANVAS.
Sorry my questions, today is my first day with Node RED

Lewis · May 31, 2024, 4:25pm

Assuming you have successfully registered a phone number with Signal, then you should be able to test everything from my Flow within Node-Red.

When you are in Node-Red, be sure to have the debug window in view (on the right side of the screen, the little bug icon).

Use the inject nodes to send yourself a message, and then reply to that message from your phone.

The debug window/console will log all the messages for sending and receiving, and also show errors if there are any.

fseven · November 26, 2024, 8:23pm

Lewis - This is great stuff! I just wanted to send a quick thanks for posting.

fseven · December 20, 2024, 12:47am

Lewis -

As a follow up, I wanted ti let you know that I am able to control HA remotely using Signal and the local Agent service. I even wrote a custom intent that allows me to take a Signal message and broadcast it on the home speakers via TTS. My wife loved it when I had the service ask one of our kids to do something and then call us. Saved us from trying to get them to answer the phone!

Daniel

Lewis · December 20, 2024, 1:52am

Daniel

What a great idea! I was so focussed on just making it work. And the best I got to was using geotags to have HA send a notification upon returning to “home” to provide door lock status, and then permit unlocking with a text response.

It was obviously merely for my own enjoyment, as my family members are satisfied with using Apple Home to unlock / lock doors.

And yet, I frequently would go through a cumbersome process of manually typing in text to a service call to make announcements on Alexa.

Your solution is so much better!

Thanks for the feedback. It takes a lot of time to find solutions, and more time to document it in a way that others can understand. So it’s nice to know that other people find it all useful.

fseven · December 20, 2024, 4:01am

(EDIT: I had a breakthrough on how to create multiple Intent slots. It apparently needs at least one word between slots to work. In any event, this update now allows for Signal messages to be targeted to a particular person, or more generically ask/tell)

Well, please allow me to return the favor and get you started!

I have a penchant to P.G. Wodehouse, which explains some of the response returns. I do enjoy, though, that not every response is the same.

I would love to hear how you get on with this.

This is the custom intent. The script.message_announcement is a custom action that works with my specific speakers to produce the TTS, so you will need to change that. Feel free to leave my name in the announcement message, although that may prove awkward with the family.


alias: Announcement intent
description: ""
triggers:
  - trigger: conversation
    command:
      - tell {person} this {message}
      - tell {message}
    id: message
    enabled: true
  - trigger: conversation
    command:
      - ask {person} this {message}
      - ask {message}
    id: question
  - trigger: conversation
    command:
      - (hello|greetings)
      - good (morning|afternoon|evening|day)
    id: greetings
conditions: []
actions:
  - choose:
      - conditions:
          - condition: trigger
            id:
              - message
        sequence:
          - action: script.message_announcement
            metadata: {}
            data:
              message: |-
                {{ trigger.slots.person }}, Daniel {{ [
                  "has a message for you",
                  "would like you to know",
                  "has said",
                ] | random
                }}, {{ trigger.slots.message }}
          - set_conversation_response: |-
              {{ [
                "I have passed on the message to",
                "I have notified",
                "I have given your message to",
                "I announced it to"
              ] | random }} {{ trigger.slots.person }}
        alias: Announce
      - conditions:
          - condition: trigger
            id:
              - question
        sequence:
          - action: script.message_announcement
            metadata: {}
            data:
              message: |-
                {{ trigger.slots.person }}, Daniel {{ [
                  "has a question",
                  "wishes to know",
                  "has asked",
                ] | random
                }}, {{ trigger.slots.message }}
            enabled: true
          - set_conversation_response: |-
              {{ [
                "I have passed on the question to",
                "I have asked",
                "I have relayed your query to",
                "I asked"
              ] | random }} {{ trigger.slots.person }}
        alias: Ask
      - conditions:
          - condition: trigger
            id:
              - greetings
        sequence:
          - alias: Greetings
            choose:
              - conditions:
                  - condition: time
                    after: "04:00:00"
                    before: "11:59:00"
                sequence:
                  - set_conversation_response: Good morning
                alias: Good morning
              - conditions:
                  - condition: time
                    after: "12:00:00"
                    before: "16:59:00"
                sequence:
                  - set_conversation_response: Good afternoon
                alias: Good afternoon
              - conditions:
                  - condition: time
                    after: "17:00:00"
                    before: "03:59:00"
                sequence:
                  - set_conversation_response: Good evening
                alias: Good evening
        alias: Greeting
mode: single

This is my Signal response handler. It will publish to the HA Assistand relay the response back to you in text. Personally, I find this a far more secure and private means of interacting with one’s HA that the usual manner of exposing through some cloud service. Anything you be able to control with Assist, you can control over Signal.

alias: "Jarvis: Signal"
description: ""
triggers:
  - trigger: mqtt
    topic: signal/received
conditions: []
actions:
  - variables:
      command: "{{ trigger.payload_json.message|lower }}"
  - action: conversation.process
    metadata: {}
    data:
      agent_id: conversation.home_assistant
      text: "{{ command }}"
    response_variable: agent
  - action: mqtt.publish
    metadata: {}
    data:
      evaluate_payload: false
      qos: 0
      topic: signal/send
      payload: "{{ agent.response.speech.plain.speech }}"
mode: single

My next step is to add filtering for my wife and me. I want to have slightly different experiences depending on who sends the message (it also creates yet another layer of security by locking down to whitelisted numbers). This way, the TTS can specific if either my wife or I was responsible for the audio announcement.

Hope that gives you some new ideas!