Arik Sapojnik wrote:
> Nikos,
>
> Thanks for the mig command! It looks exactly what I needed.
> Regarding the UART - let's say I have a struct:
>
> typedef nx_struct MyStruct
> {
> nx_uint8_t counter;
> } MyStruct;
>
> And I want to send every second an incremented counter: 1, 2, 3 ...
> ,and I want the BaseStation to forward it to the air.
> So the packet flow should be as follows:
>
> 1. I send it to the BaseSation via SF
> 2. The message arrives at UartReceive.receive() and goes to radioQueue
> 3. radioSendTask sends the message to air.
>
> My initial question was: What exactly to send to Sf? If I send JUST
> MyStruct - nothing happens (I added printf in UartReceive.receive() to
> ensure that ). But, if counter == 0xFF, UartReceive.receive() is called.
I don't know why this would happen, but I'd be curious why.
> (I hope I was clearer this time :) )
> Now it looks to me that I have to send message_t struct, which will be
> entirely forwarded to the air...
>
I think you are right though, you do need to send a message_t struct
(has a header and a footer besides the payload). The way it's done
through the sdk is that you use the mig generated code to configure the
payload (MyStruct in your case) and let the sdk take care of the rest.
I haven't used it in C, but in case it helps, here's how it's done in
java (taken from TestSerial.java) :
public void sendMsg(int toMote) {
MyStruct payload = new MyStruct();
try {
payload.set_counter( mycounter );
mycounter++;
moteIF.send(toMote, payload);
catch (IOException exception) {
System.err.println(exception);
}
}
toMote should be -1 (equal with AM_BROADCAST_ADDR) for every mote to
receive, otherwise set to the moteid you are sending to.
where moteif is a mote interface object parametrized with your serial
configuration
and MyStruct is the mig generated class from your header file.
Best Regards,
Nikos
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