[Discuss-gnuradio] Adding dual usrp sink block to benchmark_tx.py

[Jay Gaona]

Hello everyone,

I've added a dual usrp sink block and duplicated the tx flow graphs in benchmark_tx.py example. However, I am unable to transmit packets when I set the following in the flow graph:

self.packet_transmitter = \
    blks2.mod_pkts(modulator,
                           access_code=None,
                           msgq_limit=4,
                           pad_for_usrp=True)
   
self.packet_transmitter_2 = \
    blks2.mod_pkts(modulator_2,
                           access_code=None,
                           msgq_limit=4,
                           pad_for_usrp=True)


self.connect(self.packet_transmitter,     self.amp,     (self, 0))
self.connect(self.packet_transmitter_2, self.amp_2, (self, 1))

I have tried the following 2 codes and were able to transmit packets from the first flow graph, and then the packets from the second flow graph:

self.connect(self.packet_transmitter,     self.amp,     (self, 0))
self.connect(self.null_source,                  self.amp_2, (self, 1))

self.connect(self.null_source,                 self.amp,     (self, 0))
self.connect(self.packet_transmitter_2, self.amp_2, (self, 1))

Any idea why I am unable to simultaneously transmit packets from both flow graphs? Thanks in advance!