Sure - you can modify the basestation application to retransmit if you don't get an ack. Take a look at the PacketLink component and interface, it will help you do so automatically. For my deployment applications where good connectivity is required, I've modified base station to use the PacketLink interface to automatically retry failed transmissions.
The acks will not automatically retransmit your packet, but will let you know if a single send got through or not. -David -----Original Message----- From: André Miguel de Almeida Marrão Rodrigues [mailto:[EMAIL PROTECTED] Sent: Thursday, December 13, 2007 3:04 PM To: David Moss; tinyos-help@Millennium.Berkeley.EDU Subject: Re: [Tinyos-help] Hardware Address Recognition Hi >The base station does not automatically retransmit failed packets. It means that I should change the code of the standard basestation that comes with T2.02? Includind adding buffer to allow retransmission of packets? > interference - it's possible from wifi > collisions - in this configuration I think they should be very few > range - that's not an issue in this case > mismatched duty cycling parameters, etc. Did you modify your base station application to configure the outbound packet for delivery to a duty cycling receiver - yes we did So if the major problem is interference the acks shoudn't have resolved it? Thanks, André Rodrigues -----Original Message----- From: André Miguel de Almeida Marrão Rodrigues [mailto:[EMAIL PROTECTED] Sent: Thursday, December 13, 2007 11:20 AM To: David Moss; 'André Cunha'; 'TinyOS ML' Subject: Re: [Tinyos-help] Hardware Address Recognition Hi I would like to know why in a simple configuration like BS <---> Node I have packet loss when the acks are enabled and the code in the node retransmits the packed if it get lost. We are using 2% low power listening mode in T2 / TMote. Any ideias would be very apreciated. Regards, André Rodrigues PS: If a packet get lost in the BS -> node direction, the 2.02 basestation code does the retransmission? ----- Original Message ----- From: "David Moss" <[EMAIL PROTECTED]> To: "'André Cunha'" <[EMAIL PROTECTED]>; "'TinyOS ML'" <tinyos-help@millennium.berkeley.edu> Sent: Thursday, December 13, 2007 5:16 PM Subject: RE: [Tinyos-help] Hardware Address Recognition > Address recognition is in both hardware and software. You can disable > address recognition in hardware to sniff packets, but with software > acknowledgements enabled you don't want to send an ack back unless you've > received a packet to your local address or to the broadcast address. > That's > why there's a redundant check. > > Hardware address recognition is enabled by default, and the redundant > software address check performed for acknowledgements doesn't change that. > > Note at the top of CC2420ControlP the compile time options you have > available (you should be able to configure these at runtime as well) > > #if defined(CC2420_NO_ACKNOWLEDGEMENTS) > autoAckEnabled = FALSE; > #else > autoAckEnabled = TRUE; > #endif > > #if defined(CC2420_HW_ACKNOWLEDGEMENTS) > hwAutoAckDefault = TRUE; > #else > hwAutoAckDefault = FALSE; > #endif > > // This changes the hardware address recognition. > #if defined(CC2420_NO_ADDRESS_RECOGNITION) > addressRecognition = FALSE; > #else > addressRecognition = TRUE; > #endif > > -David > > > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of André > Cunha > Sent: Thursday, December 13, 2007 9:21 AM > To: TinyOS ML > Subject: [Tinyos-help] Hardware Address Recognition > > Hello all, > I was looking at the hardware recognition in the CC2420 in the file > CC2420ControlP and, if fact, the CC2420 register (MDMCTRL0->ADDR_DECODE) > is enabled. Looking at the CC2420ReceiveP in the RXFIFO.readDone I > realized that the address verification is by software. Can anyone > clarify this? I have changed the code of RXFIFO.readDone to only signal > data reception but I would like to activate the hardware address > recognition. > > Best Regards, > > André > _______________________________________________ > Tinyos-help mailing list > Tinyos-help@millennium.berkeley.edu > https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help > > > > _______________________________________________ > Tinyos-help mailing list > Tinyos-help@millennium.berkeley.edu > https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help _______________________________________________ Tinyos-help mailing list Tinyos-help@millennium.berkeley.edu https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
