Yup, its alot of playing around with...:( Expect dies with errors, even tried to switch to raw mode didnt help.

tcsetattr: Input/output error
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basically there is traffic, ssh is sending keep alives so timeout is set from server side to 60 seconds, which is to long.. setting timeout on my side doesnt change anything.. its interesting. added \n but didnt help.. I tried with a fork and to create piped filehandels but no information was sent to the main process... I guess hp has a very odd TTY implementation.