Are there any ISO packets thransferred when the BIS gateway pauses playback?

Question

Dear All, 
 I need your help to clarify some LE Audio protocol related concepts. 
 For the BIS use cases. When the PC pause the playback, after that, are there any ISO packets transfered by the BIS gateway. 
 or some empty iso packets? 
 
 And I want to know is there any plan for the Nordic to upgrade the nrf sniffer tool to support LE Audio related features. 
 
 Best Regards. 
 Tommy.

Elfving · Accepted Answer

Sorry about the wait Tommy, 
 I asked the relevant R&D team just to be sure. T he BIS gateway won't send ISO packets contains PCM with "0"s if there's no stream playing from PC. Here is a sniffer trace showing this:

The payload size of the BIS ISO packets is "0". Same device, but after we press "play/pause" for stop sending BIS ISO packets we get this. 
 
 So there's no ISO, but only EXT-ADV and PER-ADV packets. 
 For SD card mix and play feature, that is in receiver side, if the receiver is in play state, then user can enter command for triggering "play lc3" from file, and that will trigger the decoding, then mixing to I2S buffer. 
 Regards, 
 Elfving

Are there any ISO packets thransferred when the BIS gateway pauses playback?

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