This is an expect script that establishes a connection to the IP and port you give it to check connectivity from a remote host.

telnet_connectivity_check.exp

#!/usr/bin/expect -f
#set multiPrompt {[#>$] }
#exp_internal 1
set NODE [lindex $argv 0];
set IPz [lindex $argv 1];
set Portz [lindex $argv 2];
set Passwdz [lindex $argv 3];
#log_file -noappend output.log
set timeout 1
set force_conservative 0  ;# set to 1 to force conservative mode even if
if {$force_conservative} {
        set send_slow {1 .1}
        proc send {ignore arg} {
                sleep .1
                exp_send -s -- $arg
        }
}

spawn ssh -q $NODE

expect {
       "assword:" { send -- "$Passwdz\r" }
        "$" { puts "At Promt " }
        }

send -- "telnet $IPz $Portz"
expect {
        "Trying..." { puts "Trying..." }
        "character" { puts "You are Connected" }
        }
send -- "\x1D"
send -- "\x1D"
send -- "quit\r"
send -- "quit\r"
send -- "quit\r"
expect {
        "Connection closed." { puts "telnet connection closed." }
        "$" { puts "At Promt " }
        }

send "exit\r"


expect eof

./telnet_connectivity_check.exp RemoteHostName ClientIP ClientPort PASSWORD|grep Connected
or use without a password if you have ssh keys setup
./telnet_connectivity_check.exp RemoteHostName ClientIP ClientPort |grep Connected

much cooler scripts for the same purpose.
https://stackoverflow.com/questions/4922943/test-if-remote-tcp-port-is-open-from-a-shell-script/19866239