comitup software package provides bootstrap Wifi using Wifi, you can install in your Debian 9 (Stretch) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install comitup
comitup is installed in your system.
Make ensure the comitup package were installed using the commands given below,
$ sudo dpkg-query -l | grep comitup *
You will get with comitup package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Network |
| Package | comitup |
| Version | 0.5-1 |
| Description | bootstrap Wifi using Wifi |
| Sub Section | Net |