Contiki-NG vs QNX Neutrino RTOS

Contiki-NG is a free, open-source operating system for resource-constrained Internet of Things devices, designed for low-power communication and standard protocols. Its code footprint is on the order of 100 kB, and memory use can be configured as low as 10 kB. The IPv6 stack includes TCP, UDP, DNS, RPL, CoAP, LWM2M, and WebSockets, with IEEE 802.15.4 and TSCH support below IPv6. Documented modules include IPv6 multicast, OMA LWM2M, secure CoAP, 6TiSCH, and SNMP. Security documentation describes DTLS with Mbed TLS, pre-shared keys or certificates, and EDHOC key exchange. Link-layer security is supported for IEEE 802.15.4 TSCH; CSMA link-layer security is described as planned. Documented hardware includes TI, Nordic, Silicon Labs, OpenMote, Tmote Sky/TelosB, and Zolertia boards. Development resources include Cooja native motes, a Renode tutorial, Docker, and native Linux and macOS toolchain setup. It is available for Linux, macOS, Windows, and self-hosted environments, and source code is distributed under the 3-clause BSD license unless otherwise specified.

QNX Neutrino RTOS is a real-time operating system for embedded applications, including medical instruments, routers, telematics devices, process-control systems, and air-traffic-control systems. Its microkernel architecture keeps drivers, applications, protocol stacks, and file systems outside the kernel in memory-protected user space. If a component fails, the system can terminate it, reclaim its resources, and restart components without rebooting. Networking technologies include IPv4, IPv6, IPSec, FTP, HTTP, SSH, and Telnet. QNX Momentics is an Eclipse-based development environment with memory-protection diagnostics and system tracing. The RTOS supports multiprocessing, transparent distributed processing, and POSIX-based application portability, and lists support for MIPS, PowerPC, SH-4, ARM, StrongArm, XScale, and x86. QNX Software Center manages downloads of QNX Software Development Platform versions 7.x and 8.x. The product is paid, with runtime licensing options available by contacting QNX sales; there is no free plan, but a 30-day trial is offered for evaluation and exploratory development, not commercial development. QNX describes its Safe Kernel as certified to IEC 61508 Safety Integrity Level 3.