Hi! On Mon, 19 Jan 2009, Miklos Maroti wrote:
> On Mon, Jan 19, 2009 at 4:12 PM, Razvan Musaloiu-E. <[email protected]> > wrote: >> Hi! >> >> On Mon, 19 Jan 2009, Andrey Gursky wrote: >> >>> Hi Razvan and Miklos! >>> >>> Razvan Musaloiu-E. wrote: >>>> Hi! >>>> >>>> On Wed, 14 Jan 2009, Andrey Gursky wrote: >>>> >>>>> Hi Razvan! >>>>> >>>>> I haven't such deeply tests as Miklos. My observations on the app level: >>>>> the messages are being successfully sent, but on the remote mote they >>>>> are being not received. >>>> >>>> What does "successfully sent" mean? You got an ack back? :P >>> >>> You're right, there are really many NACK. But many packets, which were >>> sent but not acknowledged, has being successfully received. What could >>> result in this? >>> >> >> I'm not familiar with the way the acks are implemented in RF230. On CC2420 >> the reverse problem was observed: a packet was acked even if it was not >> properly retrieved from the CC2420 FIFO. The solution was to use software >> acks: the MCU retrieved the packet and then sends a command to CC2420 >> to ask for an ack to be send. > > The ack packet on the RF230 is generated in software. If the message > was received, then it has passed the CRC check and then an ACK must > have been generated. However, the channel might have been noisy > (another message started just before the ACK packet was to be sent) so > you did not see the ACK packet, > > You can use the RF230Sniffer application to display all packets (not > just ones that pass the CRC check). With that you can see that there > are lots of random messages received on channel 26 but not on channel > 11. These messages do not show up in general because they do not pass > the CRC check, but they are there and keep the radio busy. I think we > should NOT use channel 26 for the IRIS until someone figures it our > why this happens. Razvan, please revert the change. I reverted back to channel 11. Question: from what I see in datasheet the RF230 has support for automatic acks. Is this not used by the current RF230 stack? -- Razvan ME _______________________________________________ Tinyos-help mailing list [email protected] https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
