Have a look at this burst fsk modem too
https://oshearesearch.com/index.php/2015/05/31/building-a-burst-fsk-modem-in-gnu-radio-with-message-lambda-blocks-and-eventstream/

On 28 March 2018 at 10:57, Jeff Long <[email protected]> wrote:

> Take a look at gr-eventstream and gr-*burst.
>
>
> On 03/28/2018 04:14 AM, samuel verdon wrote:
>
>> Hello everyone,
>>
>> Builind a FSK tansiever, I would like to send burst data. All the fec and
>> data maniupation are made with custom block working with message.
>>
>> After formating everything, I  convert my data to Stream with « PDU to
>> tagged Stream » block and send it to «GFSK mod » block.
>>
>> This last block needs to have a steam to work (as I understand ). My
>> burst messages come randomly from an UDP port and with different time
>> interval.
>>
>> When Nothing is tansmit the gnuradio flowgraph stops saying it does not
>> have enough data comming to « PDU to tagged stream» to work.
>>
>> How can I avoid this problem ? should I send zero between data ?  Is
>> there a bloc to do this ?
>>
>> Thank you
>>
>> Sam
>>
>>
>>
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>>
>>
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