I'll go out on a limb since I don't know T2 and guess that
getPayload(bufPtr) does NOT copy the payload buffer but just
returns a pointer to the right location in the given buf, and
additionally that one does NEED to have a copy.
Therefore I would do something like:
message_t buffer; // new message buffer -- note: "global" value
some *mySome; // utility pointer to new payload
// copy whole message
memcpy(&buffer, bufPtr, sizeof(message_t));
// get pointer to your newly copied payload
mySome = (some*)Packet.getPayload(&buffer);
// muck with stuff in new payload
mySome->data = 0xffff;
// then post task to do AM.send() as shown
MS
Muhammad Azhar wrote:
Hi all,
(I'm using TinyOS 2)
In Receive.receive(message_t* bufPtr, void* payload, uint8_t len),
supposing the payload is of "some" struct (assume it contains nodeid,
data, seqNo):
some* rcvd = (some*)payload;
Supposing I'd wanna change some value in this payload before
forwarding it to node x, should I simply do:
(1)
rcvd->data = 0xffff;
memcpy(&buffer, bufPtr, sizeof(message_t));
//assume buffer is a message_t structure
//then call "AMSend.send(x, &buffer, sizeof(some));" in another task
OR
(2)
some* rcvd = (some*)call Packet.getPayload(&buffer);
rcvd->data = 0xffff;
//I'm a bit lost as to how to continue from here
Thanks.
Regards,
Azhar
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