Re: [Discuss-gnuradio] how to decide the msgq_limit?

[Guanbo Zheng]

I have a vey similar issue in sending packets using FTW ofdm,
in which I tried sending only one packet but observe much more packets in file 
sink.
I have not figured out if it is because of msgq() or something else in lower 
layer

Best,
Guanbo

On Mar 3, 2011, at 7:03 PM, Yan Nie <address@hidden> wrote:

> Dear all,
> 
> I'm using gr.message_source as the signal source and using multiply_const_ff 
> to set the amplitude of the signal then feeding the signal into USRP1 with 
> LFTX plugged-in. The message need to be transmitted in my project is 3315 
> bytes. After the flow graph starting to run, msgq.insert_tail() is utilized 
> to insert the message into the flow graph. The amplitude changes every time 
> after the message is transmitted. I only called insert_tail() once in every 
> cycle of transmission to feed the message and expect the message to be sent 
> once, but the result turns out the times of the message transmission is 
> ranging from once to 10 times, which means sometimes the message is only 
> transmitted once, sometimes it continuously repeated 10 times. What's the 
> problem would be? What decide the parameter, msgq_limit, which is the maximum 
> number of message in the message queue? Can I send this 3315 bytes data as 
> one message and set the msgq_limit as 1?
> 
> Really appreciate any of your suggestion!
> 
> Thanks,
> Yan
> 
> The code related to message insert
> try:
>   while 1:
>        tb.set_amplitude(2000)
>        msg_13bit = gr.message_from_string(payload_13bit)
>        tb._ls.msgq.insert_tail(msg_13bit)
>        tb.set_amplitude(0)
>        msg_stop = gr.message_from_string(payload_stop)
>        tb._ls.msgq.insert_tail(msg_stop)
> 
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