<s>
RIOT	B-Device
is	O
a	O
small	O
operating	B-General_Concept
system	I-General_Concept
for	O
networked	O
,	O
memory-constrained	O
systems	O
with	O
a	O
focus	O
on	O
low-power	O
wireless	O
Internet	B-Operating_System
of	I-Operating_System
things	I-Operating_System
(	O
IoT	B-Operating_System
)	O
devices	O
.	O
</s>
<s>
It	O
is	O
open-source	B-Application
software	I-Application
,	O
released	O
under	O
the	O
GNU	B-Application
Lesser	I-Application
General	I-Application
Public	I-Application
License	I-Application
(	O
LGPL	B-Application
)	O
.	O
</s>
<s>
RIOT	B-Device
's	O
kernel	O
is	O
mostly	O
inherited	O
from	O
FireKernel	O
,	O
which	O
was	O
originally	O
developed	O
for	O
sensor	B-Architecture
networks	I-Architecture
.	O
</s>
<s>
In	O
2015	O
,	O
one	O
of	O
the	O
co-developers	O
,	O
Matthias	O
Wählisch	O
was	O
awarded	O
the	O
Young	O
Scientist	O
Award	O
of	O
the	O
Forum	O
for	O
Excellent	O
Young	O
Scientists	O
for	O
the	O
contributions	O
of	O
his	O
team	O
to	O
the	O
open	B-Application
source	I-Application
operating	B-General_Concept
system	I-General_Concept
RIOT	B-Device
.	O
</s>
<s>
RIOT	B-Device
is	O
based	O
on	O
a	O
microkernel	B-Operating_System
architecture	O
.	O
</s>
<s>
In	O
contrast	O
to	O
other	O
operating	B-General_Concept
systems	I-General_Concept
with	O
similarly	O
low	O
memory	O
use	O
(	O
such	O
as	O
TinyOS	B-Device
or	O
Contiki	B-Operating_System
)	O
,	O
RIOT	B-Device
allows	O
application	B-Application
software	I-Application
programming	O
with	O
the	O
programming	O
languages	O
C	B-Language
and	O
C++	B-Language
,	O
and	O
Rust	B-Application
,	O
also	O
by	O
an	O
experimental	O
application	O
programming	O
interface	O
(	O
API	B-General_Concept
)	O
.	O
</s>
<s>
It	O
has	O
full	O
multithreading	B-Operating_System
and	O
real-time	B-General_Concept
abilities	O
.	O
</s>
<s>
Secure	B-Protocol
Sockets	I-Protocol
Layer	I-Protocol
(	O
SSL	O
)	O
and	O
successor	O
Transport	B-Protocol
Layer	I-Protocol
Security	I-Protocol
(	O
TLS	O
)	O
are	O
supported	O
by	O
popular	O
libraries	B-Library
such	O
as	O
wolfSSL	B-Protocol
.	O
</s>
<s>
RIOT	B-Device
runs	O
on	O
processors	O
of	O
8	O
bits	O
(	O
such	O
as	O
AVR	O
Atmega	O
)	O
,	O
16	B-Device
bits	I-Device
(	O
such	O
as	O
TI	B-Architecture
MSP430	I-Architecture
)	O
,	O
and	O
32	O
bits	O
(	O
such	O
as	O
ARM	O
Cortex	O
)	O
.	O
</s>
<s>
A	O
native	O
port	O
also	O
enables	O
RIOT	B-Device
to	O
run	O
as	O
a	O
Linux	B-Application
or	O
macOS	B-Application
process	O
,	O
enabling	O
use	O
of	O
standard	O
developing	O
and	O
debugging	O
tools	O
such	O
as	O
GNU	B-Application
Compiler	I-Application
Collection	I-Application
(	O
GCC	B-Application
)	O
,	O
GNU	B-Language
Debugger	I-Language
,	O
Valgrind	B-Application
,	O
Wireshark	B-Language
,	O
etc	O
.	O
</s>
<s>
RIOT	B-Device
is	O
partly	O
Portable	O
Operating	B-General_Concept
System	I-General_Concept
Interface	O
(	O
POSIX	O
)	O
compliant	O
.	O
</s>
<s>
RIOT	B-Device
provides	O
multiple	O
network	O
stacks	O
,	O
including	O
IPv6	B-Protocol
,	O
6LoWPAN	B-Protocol
,	O
or	O
content	B-Protocol
centric	I-Protocol
networking	I-Protocol
and	O
standard	O
protocols	O
such	O
as	O
RPL	B-Protocol
,	O
User	B-Protocol
Datagram	I-Protocol
Protocol	I-Protocol
(	O
UDP	O
)	O
,	O
Transmission	B-Protocol
Control	I-Protocol
Protocol	I-Protocol
(	O
TCP	O
)	O
,	O
and	O
CoAP	B-Device
.	O
</s>
<s>
RIOT	B-Device
source	O
code	O
is	O
available	O
on	O
GitHub	B-Application
,	O
and	O
developed	O
by	O
an	O
international	O
community	O
of	O
open	B-Application
source	I-Application
developers	O
.	O
</s>
