Monitoring a specific port without SNMP or CLI credencials

Monitoring a specific port without SNMP or CLI credencials

Hi there,
 
We need to monitor a device TCP port 1521 (Oracle), but we don't have any credencials for this device. It is on our customer network, which we have access through our radio link (peer-to-peer) and we need to monitor if this TCP/1521 port is up or down.
 
Is there any way to do this, like a "telnet" monitoring?
telnet x.x.x.x 1521
 
Thanks in advance.
 
Regards,
Gabriel Guimarães
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