How does Android Chrome send newline from soft keyboard?

I am attempting to access an ESP32 microcontroller running MicroPython over a web interface using the following page WebREPL which within my local network using Chrome on my PC is all fine. The problem arises when I use the same page from my Android using Chrome and attempt to input the password, followed by the 'enter' key which is promptly rejected as the wrong password - the password I have configured uses only upper and lowercase with no symbols so the only way I can see things getting FUBAR is with the line ending being sent. Can anybody shed some knowledge on what ascii or whatever code the keyboard would be sending back through the connection, or if there is any possibility there is a space being appended first (the web page does not echo the password keys being entered) - also are there any apps or hacks to give more transparency to what the keyboard is sending in general for non alphanumeric characters?