I think you should use stream tags.In uhd you can send a command with each
Burst this command is to be executed by the usrp one command is called
tx_freq I think.
You can check this through the internet.
Br,
Osama

On Wednesday, November 9, 2016, Dat Luu <[email protected]> wrote:

> Hello everyone,
>
> I have been working on tx/rx data using USRP B210. I am able to transmit a
> message and verify the correct content on the receiver side. The next step
> I want to do is:
>
> 1. upon sending a specific message (frequency change), I want to change
> the frequency of the USRP sink (tx side)
> 2. upon receiving a specific message (frequency change) I want to change
> the frequency of the USRP source (rx side)
>
> My question is what will be the best way to do it? I know that I will need
> to pause the flow graph on tx/rx side, and reload the USRP blocks with the
> new frequency. But, I dont know when the message will arrive; I cannot do a
> timing triggering on the flow graph.
>
> Thank you in advance.
>
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