Hello,
In the BBN 802.11 package, I see the scripts for receiver, and some lines of
code for packet handling as well.
======================================================
def rx_callback(ok, payload):
size = struct.calcsize("@qHBB");
packet_data = payload[size:];
hdr = struct.unpack("@qHbB", payload[0:size]);
if len(packet_data) > 16:
data_hdr = struct.unpack("@BBBBBB", packet_data[10:16])
mac_str = "%02x:%02x:%02x:%02x:%02X:%02X" % \
(data_hdr[0], data_hdr[1], data_hdr[2],
data_hdr[3], data_hdr[4], data_hdr[5],)
else:
mac_str = "UNKNOWN"
print "PKT: len=%d, rssi=%d, src=%s, time=%ld, rate=%d Mbps" \
% (hdr[1], hdr[2], mac_str, hdr[0], hdr[3]/ 10.0)
=======================================================
What does the struct.unpack do? Is it for formatting the packet for display?
coz when I tried to do this: print "payload: %s" % payload, what got
displayed on the screen is like this:
payload: �,Q
�������F(�F(�p��j{Yd!
䀹����
0H
*2$`l�
And what exactly the "time" is? As I see in the script, is it in ticks?
means the time instance, or the inter-arrival time?
--
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