Editing Header/Payload Demux

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# Timing tags might be relevant to know when a packet was received. By specifying the name of a timestamp tag and the sample rate at this block, it keeps track of the time and will add the time to the first item of every packet. The name of the timestamp tag is usually 'rx_time' (see, e.g., gr::uhd::usrp_source::make()). The time value must be specified in the UHD time format.
 
# Timing tags might be relevant to know when a packet was received. By specifying the name of a timestamp tag and the sample rate at this block, it keeps track of the time and will add the time to the first item of every packet. The name of the timestamp tag is usually 'rx_time' (see, e.g., gr::uhd::usrp_source::make()). The time value must be specified in the UHD time format.
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# Other tags are simply stored and updated. As an example, the user might want to know the rx frequency, which UHD stores in the rx_freq tag. In this case, add the tag name 'rx_freq' to the list of special_tags. This block will then always save the most current value of 'rx_freq' and add it to the beginning of every packet.
 
# Other tags are simply stored and updated. As an example, the user might want to know the rx frequency, which UHD stores in the rx_freq tag. In this case, add the tag name 'rx_freq' to the list of special_tags. This block will then always save the most current value of 'rx_freq' and add it to the beginning of every packet.
  

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