Dear Eric,
I tried to follow you. I ended up with the code below, yeti does not show any
errors. So is this correct way to check for a radio message destinaton address?
event message_t * RadioReceive.receive(message_t *msg, void *payload, uint8_t
len)
{
message_t* temp = (message_t*) msg;
//Top in my code I have: uses interface AMPacket;
uint16_t destAddress = call AMPacket.destination(temp);
if(destAddress == 32564)
//Do stuff, else do nothing
return msg;
}
Can you also please clearify this, DESTIONATION_ADDRESS is the mote that
intended to receive the message, and SOURCE_ADDRESS is the node sending the
message?
I have 3 motes: The first one is running base station app and I send various
serial packets and it broadcasts it. I have set the destination address in the
serial packet that goes to the basestation, both motes will receive it and if
the destination address is correct they will do theire job on the packet.
Is this a correct approach? How about TOS_NODEID? Is it more recommended or
its just another option.
Really appriciate your help.
Regards,
Sean.
----- Original Message -----
From: Eric Decker
Sent: 01/12/13 05:00 AM
To: Sean Dekker
Subject: Re: [Tinyos-help] Checking for AM GROUP and AM TYPE
yep. But it isn't off the payload.
take a look at:
tos/platforms/telosa/platform_message.h
you'll see that a message_header_t is made up of the union of cc2420_header_t
and serial_header_t.
In tos/types/message.h all this various kruft is brought together into
message_t.
But to properly access the appropriate place in the header you have to use the
accessor macros which also depend on you knowing what kind of packet you are
looking at. Serial or Radio etc.
Take a look at tos/lib/serial/SerialActiveMessageP.nc
On Fri, Jan 11, 2013 at 8:44 AM, Sean Dekker < [email protected] > wrote:
Hi,
Well know I did change source and destination addresses for different nodes,
now the question is how to access them? I mean for example is there such thing
like:
event message_t * RadioReceive.receive(message_t *msg, void *payload, uint8_t
len)
{
if(payload->DESTINATION_ADDRESS == 32465)
//do stuff
return msg;
}
----- Original Message -----
From: Eric Decker
Sent: 01/11/13 07:03 AM
To: Sean Dekker
Subject: Re: [Tinyos-help] Checking for AM GROUP and AM TYPE
On Thu, Jan 10, 2013 at 10:49 PM, Sean Dekker < [email protected] > wrote:
Hi all,
I can successfuly receive radio packets on TelosB platform. However, all the
nodes that I am working with do receive the packet from BaseStation mote. How
can I check if a packet is intended to come into a specific mote?
The way this is supposed to work is via addressing.
AM packets have 16 bit source and destination fields. It sounds like they
aren't being used properly and doing address discrimination.
Rather than putting together a work around, figuring out why the address
discrimination doesn't work properly might be a reasonable approach.
Just a thought.
For example I have the follwoing code in header of my application:
enum
{
//Active Message Type
AM_TYPE = 8,
//Active Message Group
AM_GROUP = 22
};
And in my app I have this code to receive packets:
event message_t * RadioReceive.receive(message_t *msg, void *payload, uint8_t
len)
{
if(len == lenComMsg)
{
MyPacket_t* inc = (MyPacket_t*) payload;
switch(inc->Command)
{
case 's':
StartSci();
return msg;
default:
//Do nothing!
break;
}
}
}
So my question is how can I check if the incoming packet has AM GROUP set to 22
and AM TYPE set to 8?
This is the code from my configuration file:
components ActiveMessageC;
components new AMSenderC(AM_TYPE);
components new AMReceiverC(AM_TYPE);
App.RadioPacket -> AMSenderC;
App.RadioSend -> AMSenderC;
App.RadioControl -> ActiveMessageC;
App.RadioReceive -> AMReceiverC;
So shoud I change the AM_TYPE each time I am going to program a mote, or I can
just check for it in receive event in my code?
Regards,
Sean.
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--
Eric B. Decker
Senior (over 50 :-) Researcher
--
Eric B. Decker
Senior (over 50 :-) Researcher
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