Splunk Apps » Insteon

I have two questions outstanding at this point:

1) How do I determine the length of a insteon send message?
2) How does pyinsteon currently ignore messages without confusing the length?

The socket is opened with MSG_DONTWAIT. Wondering if read() with a buffer size greater than the data-size causes it to block or just grabs the packet available.

__process_StandardInsteonMessagePLMEcho() accepts the send messages. Some open questions:

• Are 7 bytes enough for the entire body? Packet captures show more.
• How is 0x0062 packet being considered in the 0x0050 function?

Here is the message:

02 62 30.46.F6 05 19 01 06
02 50 30.46.F6 2C B8 4E 25 00 01

I see now that a single packet includes both the sent message and the response.

The second call is:

02 62 30.46.F6 05 19 02 06
02 50 30.46.F6 2C B8 4E 25 00 00

From https://github.com/hollie/misterhouse/blob/stable/lib/Insteon/MessageDecoder.pm:

} elsif($plm_cmd_id eq '0262'){
     $plm_message .= sprintf("%24s: ",'To Address').substr($plm_string,4,2).":".substr($plm_string,6,2).":".substr($plm_string,8,2)."\n";
     $plm_message .= sprintf("%24s: ",'Message Flags').substr($plm_string,10,2)."\n";
     $plm_message .= insteon_message_flags_decode(substr($plm_string,10,2));

     my $flag_ext = hex(substr($plm_string,10,1))&0b0001;

     $plm_message .= sprintf("%24s: ",'Insteon Message').substr($plm_string,12,($flag_ext ? 32 : 4))."\n";
     $plm_message .= insteon_decode(substr($plm_string,10));
     $plm_ack_pos = $flag_ext ? 44 : 16;
}

• to address: 3 bytes
• message flags: 1 byte
• message: 2 bytes

Note sure what the insteon_decode() call is for at position 10.

I think I can ignore the last byte. insteon_decode() seems to refer to it as the "ack byte" but ignores it:

#Truncate $command_string to remove PLM ACK byte
$command_string = substr($command_string,0, ($extended ? 34 : 8));