The PING command is used to check if a remote is responding.
It should always be sent as the first command for testing purpose, a connection should
be terminated if a PING request fail.
Request
Command
Argument
PING
Ping
Ping: can be anything
Response
Command
Argument
PING
Pong
Pong: exactly the same value as the received Ping
Example
PING
Hello World!
Request
PING
Hello World!
Response
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