SENA Parani100 - Manual (Page 52)

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PRSV <on|off>
: A TCP data port is created as a Bluetooth connection is made. So, as a
Bluetooth connection is disconnected, the corresponding TCP port is
closed. If users want to open the corresponding TCP port even after
disconnection of Bluetooth, PRSV command can be used.
During PRSV is on, users do not need to make TCP connection each time
even if the Bluetooth connection has stopped temporarely.
Ex.: PRSV on
+OK
KATO <time> <probe> <interval>
: To configure ‘TCP Keep Alive Time’
When the Host, which is communicating (TCP) Parani100, is stopped
unintentionally, Parani100 is not aware this unexpected disconnection.
Accordingly, Parani100 sends packets to check the response and
connection status when there is no data communication for certain time.
When there is no data communication for <time>, Parani100 will send data
packet to check the connection <probe> times, by each <interval>, before
to finalize or continue the connection. Below example means when there
is no communication for 10 min., Parani100 will send checking packets 3
times by 10 seconds interval.
Ex.: KATO 600 3 10
+OK KATO 600 3 10