I send 3 packet (length 28 byte)of 1 that is 84 ones then I send 3 packets of 2s and go on untill 100 .So I think of receive at the basestation 84 ones then 84 twos then 84 threes untill 100 but sometimes I received 84 ones and then 92 twos for example and then 84 trees .I don't understand why I obtain 92 twos when I have to receive 84 .This happen when I use batteries because when I use usb cable to power tmote this problem don't happen.I use packetacknoledge of CC2420ActivemessageC to know if a packet is received corretcly and if I don't receive ack of the packet send in th sendDone event I retransmit it .Tomorrow I try to use packetlink as You suggeste. Thank you very much Razvan ME :I think that you have already help me in the past.
Bye Giorgio ----- Messaggio Originale ----- Da: "Razvan Musaloiu-E." <[email protected]> Data: Lunedi', Novembre 9, 2009 9:15 pm Oggetto: Re: [Tinyos-help] packet ack A: giorgio <[email protected]> Cc: [email protected] > Hi! > > On Mon, 9 Nov 2009, giorgio wrote: > > > I have a node that send packet to a base station and use > packet acknoledge to > > know if a packet it is send or not .So I use > CC2420ActivemessageC as component > > and use his interface PacketAcknowledgements : > > what I don't understand is why sometimes not always when the > node sender not > > receive the ack and resend the same packet the node > basestation receive a > > piece of the same packet plus the same packet full. > > Can you be more specific about what "a piece of the the same > packet" > means? > > > It seems that also it has not received the packet according > the > > packetacknoledgement it has receive a piece of it .This > behaviour is > > very rare if I use usb cable to power the tmote but more usual > when I > > use rechargeble batteries ?It appear as false ack. Someone > know to solve > > this problem or know what is the right strategy to use with > > packetacknolegments ? > > > > Have you tried to use the PacketLink interface? The PacketLink > takes care > of retransmitting the packet and filtering the duplicates. > > -- > Razvan ME >
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