I quit using this method and am using a Home Assistant custom component. https://github.com/fancygaphtrn/pk5001z

Retrieve JSON formatted WAN information from a Zytel PK5001Z modem

I use this to get information about my DSL modem into Home Assistant

usage: GetWANDSLInfo.py [-h] [-v] host user pw

Retrieve JSON formatted WAN information from a Zytel PK5001Z modem

positional arguments: host DSL modem hostname/IP address user DSL modem user name pw DSL modem password

optional arguments: -h, --help show this help message and exit -v, --verbose verbose prints debug information

Return data: {"download": "1.792", "upload": "0.605", "dslStatus": "CONNECTED", "internetStatus": "CONNECTED", "modemIP": "xx.xx.xx.xx", "RemoteIP": "xx.xx.xx.xx"}

sensor:
  - platform: command_line
    name: DSL download
    unit_of_measurement: Mbps
    scan_interval: 300
    command: !secret dsl_command
    value_template: '{{ value_json.download }}'
  - platform: command_line
    name: DSL upload
    unit_of_measurement: Mbps
    scan_interval: 300
    command: !secret dsl_command
    value_template: '{{ value_json.upload }}'

dsl_command: '/usr/src/dsl/GetWANDSLInfo.py x.x.x.x user password'