Re: contiki data transmission speed

Thank you for you reply !
I hava a simple description of the test way  i used :
I send the data invoke the function : uip_udp_packet_send(struct uip_udp_coon, const void *data, int
len) ;
and 8 times per second to send for 64bytes to pc;
 i hava 4 nodes , the node1, node2, node3 is data node, send data to pc ;  node4 is border router  ;
if i start nodes(node 1,node2,node3,node4) very close   ,i can collected about 95% of  the data on the
computer , when i put the node1 far, about 500 meters, i have ensured the i can not receive its data. then i
placed the node2  between node1 and border root , i can receive the data  both of  node1 and node2 ,but node1
lost packet above 90%  and node2 also lost packet 60%. i donot know why .
i use cc2530 chip.
thanks for your help 
------------------				 
Tom
2012-06-18

-------------------------------------------------------------
From："David Kopf" <dak664 <at> embarqmail.com>
Sent：2012-06-18 18:51
To：contiki-developers
Subject：Re: [Contiki-developers] contiki data transmission speed

Many factors will affect data throughput; packet length, radio duty cycling, 
ack time, checksum errors, collisions. The best I have seen with no acks is 
25KB/sec one way. About the hop loss, more details need to be provided.

-----Original Message----- 
From: Tom
Sent: Sunday, June 17, 2012 10:16 PM
To: contiki-developers
Subject: [Contiki-developers] contiki data transmission speed



Hi all
Whether someone  tested actual transmission speed on contiki , use udp of 
ipv6 ;
i want know the actual transfor speed of the contiki , i test it , i just 
get the speed for  4kb/s, however, in this case , the data must be sent 
directly to the border roouter node which directly connect the pc ,  if the 
data is a hop , the data will be lost serious ,even more than 90% losted. i 
donot know why .
hope for your help . thanks 


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Live Security Virtual Conference
Exclusive live event will cover all the ways today's security and 
threat landscape has changed and how IT managers can respond. Discussions 
will include endpoint security, mobile security and the latest in malware 
threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
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