AOR ARL2300 User Manual page 26

Furthermore, UDP requires audio transmission start command immediately after the "p"
command.
The UDP command is @p1. This command should be sent to the ARL2300 every 10 to 120
seconds until audio transmission is stopped. To temporarily stop the UDP data transmission from
the ARL2300, the q1 command should be issued. To stop the UDP data transmission completely,
the q command should be issued. The q1 command can be altered by q if complete termination
of UDP transmission is needed.
■ AUDIO DATA
Audio data is an uncompressed PCM with symbol consisting of 16-bit little-endian format. One
payload can carry 800 octets as initial value. The size can be changed by "b" command as
described in chapter 8.2.1 "Special command prefixes". However, maximum octet value should
be smaller than the result code of 234 and it should be an even number.
The maxim audio data size shown in the TCP Communication Chart is 2048, that is a part of result
code 234 (234-AUBFSZIE2048) shown in the example.
■ SEQUENCE NUMBER
Every single octet data send over UDP has a sequence number between 0 and 255. The sequence
number increases in every UDP packet transmission.
■ TIME-STAMP
The time-stamp format is a value in seconds started from Jan 1, 1970. (aka UNIX time) and it
represents the latest incidence of the generated data. The time-stamp is 4 octets in size and
stored in big-endian format. The inclusion of TIME-STAMP can be selected by the " t" command as
described in chapter 8.2.1 "Special command prefixes". The default value is t0 (No TIME-STAMP
is added).
■ LM VALUE
The LM value space of the UDP payload stores the leading 9 characters string of the actual LM
value. If the associated receiver responds with the LM command, the receiver sends the LM value.
The inclusion of LM can be selected by the " l " command as described in chapter 8.2.1 "Special
command prefixes". The default value is l0 (No LM value is added).
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