Timer.getNow() starts over at zero after every boot, so you’re probably using the same seed every time unless something during the boot process takes a variable amount of time (and on an embedded system or in the simulator, it probably takes the same amount of time, every time – at least down to the millisecond level). Michiel
From: tinyos-help-boun...@millennium.berkeley.edu [mailto:tinyos-help-boun...@millennium.berkeley.edu] On Behalf Of Jisha Mary Jose Sent: Thursday, July 10, 2014 11:18 To: Eric Decker Cc: Tinyos Help Request; Tinyos-Help Subject: Re: [Tinyos-help] random number I did that, i changed the seed. But still same numbers are generated again and again at a particular node. Regards, Jisha Mary Jose ......jMj...... On 10 July 2014 13:05, Eric Decker <cire...@gmail.com<mailto:cire...@gmail.com>> wrote: asked and answered. The random number generator is pseudo-random. It starts up using a SEED which you need to modify to get different sequences. On Wed, Jul 9, 2014 at 11:52 PM, Jisha Mary Jose <jishamary1...@gmail.com<mailto:jishamary1...@gmail.com>> wrote: Hi, I have to generate random number for a node to use in key generation. But i always get the same random number. So ichanged seed value using the current system time as shown below. module SecurityC{ uses interface Boot; uses interface Random; uses interface ParameterInit<uint16_t> as SeedInit; uses interface Timer<TMilli>; } implementation{ uint32_t rand1; uint32_t t; event void Timer.fired() { t=call Timer.getNow(); dbg("Boot", "%s Current time: %d \n", sim_time_string(), t); } event void Boot.booted() { dbg("Boot", "Application booted.\n"); t=call Timer.getNow(); call SeedInit.init(t); rand1 = (call Random.rand32()%10)+7; dbg("Boot", "%s Random number 1: %d \n", sim_time_string(), rand1); } } But still i am getting the same number always. How to solve this? Regards, Jisha Mary Jose ......jMj...... _______________________________________________ Tinyos-help mailing list Tinyos-help@millennium.berkeley.edu<mailto:Tinyos-help@millennium.berkeley.edu> https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help -- Eric B. Decker Senior (over 50 :-) Researcher
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