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Can anyone help me on this?  

I would like to know how to send a simple message in byte format to emonhub and subsequently to a node through EmonPi.

I can send a simple message with an integer with this format from command line:  
wget --delete-after http://emoncmsaddress/nodes/10/tx/values?apikey=XXXXXXXXXXXXXXXXXXX --post-data="65540"  
note that the tx section is set for node 10 for the above command to work, but I couldn't ever send more than one variable even configuring it in the nodes:
    [[[tx]]]
        names = O
        units = X
        scales = 1
        datacodes = L

But instead I would like to send a sequence of bytes (not always the same quantity) that would be sent to the serial port and received at the node like this:  
10,7,0,23,42,50,s
where 10 is the destination node and could be omitted if specified in other way like in the above link, the same would apply to the "s", but defining the "s" would also be good the send different types of messages.

And preferably through the GET method instead of POST so I could easily send it from the browser address.

Cheers.