How to pair secondary device?

[shalak]

I have the REST API running as a home assistant addon, I did the registration using a fresh phone number there. I'd like to install the Signal Desktop and hook it up with this account. Is it possible?

[shalak]

Found the answer in another chain.

Steps I took:

• initiated the pairing process in the desktop app
• saved the QR code to JPEG file
• used simple python script to scan it:

import cv2 as cv
from pyzbar.pyzbar import decode
import argparse

# Set up argument parser
parser = argparse.ArgumentParser(description="Decode QR Code from an image file.")
parser.add_argument("path", type=str, help="Path to the QR code image file.")
args = parser.parse_args()

# Read the image
qrcode_img = args.path
img = cv.imread(qrcode_img)

if img is None:
    print(f"Error: Could not read image from path '{qrcode_img}'")
    exit(1)

# Decode the QR code
decoded_data = decode(img)

if not decoded_data:
    print("No QR code detected in the image.")
    exit(1)

# Parse and print the decoded data
url = decoded_data[0].data.decode()
print(f"URL:\n{url}")

• copied the URL
• since I'm running CLI REST as a Hassio Addon on HassOD, I SSHed into the "real" system and docker exec -it <something>_signal_addon bash:

su signal-api
signal-cli --config /config -u "+ACCOUNT_NUMBER" addDevice --uri "URL_GOES_HERE"

• the above showed me the following log:

INFO  SignalAccount - Config file is in use by another instance, waiting…

• run ps aux and found the PID of signal java process
• kill <PID>, the desktop app started pairing process, appeared to be stuck in contacts sync stage
• run signal-cli --config /config -u "+ACCOUNT_NUMBER" sendContacts
• desktop app finished pairing
• restarted the docker add-on from Hassio GUI