Hi, I just checked TossimPacket.nC on CVS. It seems that the support for getting RSSI has been provided. I was able to trace the source code. But, when I try to access, metadata, I get zero value.
I tried printing, (*bufPtr).metadata[1]; Note : My metadata[0] is tx_power. Any help ? Please correct me if I am doing something wrong. Thanks, Vijayant On Dec 5, 2007 4:32 AM, Urs Hunkeler <[EMAIL PROTECTED]> wrote: > Hi Vijayant, > > When a mote m1 sends a packet to another mote m2, and m2 replies with an > ack, the ack will most likely be sent with the default tx power > programmed on m2. So if you send a packet from m1 to m2 with your own > power, and you program the simulation to let the other mote respond with > the same tx power, then this differs from what would actually happen if > you would use real hardware. So what you should do instead is call the > send function with the first tx power being the tx power with which you > want to send the message from m1 to m2, and the second tx power being > the default tx power from m2. You probably would have to find out the > default tx power from m2 each time you do this because a mote could > change the default tx power at runtime. > > Cheers, > Urs > > > Vijayant Bhatnagar schrieb: > > Hi, > > I referred to the data sheet. The data sheet says that programmable > > output power range is -24 to 0 dBm (in steps of 3). There is no > > mention about reverse link gain. Do we have straightaway assume that > > it is less than that of tx ? > > > > How do I model reverse gain ? I am a bit confused. > > > > Any help is appreciated. > > > > Thanks, > > vijayant > > > > On 12/4/07, Philip Levis <[EMAIL PROTECTED]> wrote: > >> On Dec 3, 2007, at 10:01 PM, Vijayant Bhatnagar wrote: > >> > >>> Hi, > >>> Since we have started working on TinyOS a week back, I may be > >>> wrong. The following is the change I made: > >>> Please correct me if I am wrong : > >>> > >>> > >>> > >>> call GainRadioModel.putOnAirTo(destNode, sending, metadata- > >>>> ack, evt->time, power, power); //Modified by Vijayant > >> This is problematic. You are setting the TX power of the receiver's > >> ACK to be the same TX power as the transmitter. The reason this is > >> problematic is because the two might not have the same TX powers, and > >> if the receiver's power is lower than the transmitters you might get > >> lots of false negative acks. By setting it in this way, you assume a > >> perfectly consistent TX power setting scheme, which is not achievable > >> in practice. It would make your results fictional and unachievable in > >> reality. > >> > >> As for what those values can be, you should consult chip data sheets > >> (e.g., CC1000, CC2420). > >> > >> Phil >
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