Hi all,
I have 2 questions, would be nice if you can help me figure them out:
Following the tutorials, the 'receive' event of 'Receive' interface has 3
arguments, and the last one is 'uint8_t len'. so the tutorials says to check if
a packet is the packet we are interested in, we have to compare this 'len'
argument with the 'sizeof' the packet we are interested in.
Ok now if I define 2 packets with same length, what will be the situation. For
example the to packets:
//First Packet
typedef nx_struct LocalNodeMsg
{
nx_uint16_t NodeId; // 2 bytes
nx_uint8_t TimerValue; // 2 bytes
} LocalNodeMsg_t;
//Second Packet
typedef nx_struct RemoteNodeMsg
{
nx_uint16_t NodeId; // 2 bytes
nx_uint8_t RssiValue; // 2 bytes
} RemoteNodeMsg_t;
Now in the 'receive' event, how can I distinguish between these 2 packets?
I mean, does the 'sizeof()' function returns the same value for both of these
packets?
event message_t * RadioReceive.receive(message_t *msg, void *payload, uint8_t
len)
{
if(len == sizeof(LocalNodeMsg_t))
{
// handle the LocalNodeMsg_t packet
return msg;
}
if(len == sizeof(RemoteNodeMSg_t))
{
// handle the RemoteNodeMSg_t packet
return msg;
}
return msg;
}
If I have like many packets that have same length, what is the correct way to
filter them in the receive event?
Regards,
Sean.
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