TOSSIM 17.ix.2001 TOSSIM v01.a

TOSSIM 17.ix.2001 TOSSIM Capabilities Simulates large mote networks under Linux Uses existing TinyOS code (different compilation) Extensible network model Logs network activity

TOSSIM 17.ix.2001 Compiling TOSSIM Similar makefile to FULLPC Uses a few different component implementations –MAIN.c –RFM.c –POT.c –etc. system/tossim make –f MakefileTOS

TOSSIM 17.ix.2001 Running TOSSIM A few command line parameters main [OPTIONS] num_nodes Network model: simple is default –[-r ] Pause on system clock interrupts –[-p usec]

TOSSIM 17.ix.2001 Debugging Output dbg() commands in TinyOS source Many dbg flags: DBG_SIM, DBG_RADIO, DBG_CLOCK, etc. system/include/dbg_modes.h > setenv DBG=route,boot,usr2

TOSSIM 17.ix.2001 External Communication Tries to open sockets to listening servers at boot –Network packets –Network bits –Packet injection Opens a server socket for dynamic network packet injection

TOSSIM 17.ix.2001 Network Traffic GUI tools/TossimGUI.class Reads in and displays network traffic Allows packet source filtering Static packet injection (at startup)

TOSSIM 17.ix.2001

Static Packet Injection java TossimGUI [filename] File contains packets to be received by nodes … tools/radio.txt ff ff de ad be ef …

TOSSIM 17.ix.2001 Simulation Time Time represented in ticks 4 x 10 6 ticks/second e.g. 400 ticks between 10Kb radio interrupts Chosen as minimum value that allows accurate radio and system clock modeling

TOSSIM 17.ix.2001 Dynamic Packet Injection Connect to port on host Message format detailed in documentation –system/tossim/doc/tossim.tex Will be building dynamic injection tool

TOSSIM 17.ix.2001 RFM Models Simple: every mote in one cell Static: connectivity determined at startup Space: silly space-based model which uses potentiometer settings: proof of extensibility

TOSSIM 17.ix.2001 TOSSIM Internals Based on tos4.2 TOSSIM (Culler) Discrete event simulation Models clock interrupts Every event associated with specific mote Array of mote structures #define VAR(x) \ TOS_My_Frame[tos_state.current_node].x

TOSSIM 17.ix.2001 MAIN.c Event Loop while(!queue_is_empty(&(tos_state.queue))) { // Currently a race condition (dynamic injection) tos_state.tos_time = queue_peek_event_time(&(tos_state.queue)); queue_handle_next_event(&(tos_state.queue)); TOS_schedule_task(); }

TOSSIM 17.ix.2001 RFM Simulation typedef struct { void(*init)(); void(*transmit)(int, char); void(*stop_transmit)(int); char(*hears); void* data; } rfm_model;

TOSSIM 17.ix.2001 Example: Simple Model Every mote has a hearing value Every time a mote transmits, it increments hearing value for all other motes Every time a mote stops transmitting, it decrements hearing value for all other motes If hearing value greater than 1 when a mote listens, that mote heard a bit Static model uses a connectivity graph

TOSSIM 17.ix.2001 Scalability Tested with 1000 motes communicating over radio 10 simulated seconds for 1000 motes takes minutes (depends on level of optimization, debugging symbols, etc.)

TOSSIM 17.ix.2001 Conclusion Demonstration Questions