Just recently, Termius introduced a new bug using external keyboard.

I have verified that this is not an OS or TERM issue on the host, but the key sequences actually being sent by terminus.

Changing Terminal Emulation for Termius makes no difference.

The soft keyboard has no such issue:

up arrow ^[[A (escape left bracket A)
down arrow ^[[B (escape left bracket B)
left arrow ^[[D
right arrow ^[[C

control p ^[[1;5D
control n ^N

notice, control P should send ^P, but is sending ^[[1;5D

From what I can tell, this CSI sequence would be for cursor back:

CSI=^[[ (escape left bracket)
CSI n D – Cursor Back