Testo Saveris 2-T21 Wireless Profile
The Testo Saveris 2-T21 is an environmental sensor which utilises 802.11b/g/n on the 2.4GHz band. It is often found within the pharmaceutical industry, to monitor the temperature and humidity of… Continue Reading
Browsing Category: iot
MQTT 3.1.1 – Packets and Expected Application Flows (Publishing Topics)
Building on the previous post introducing MQTT, today we will analyse packets and expected application flows for clients publishing messages through MQTT 3.1.1. The following image represents a high level… Continue Reading
How to install GNU Radio and PyBombs on Ubuntu
How to setup GNU Radio, and the 802.15.4 library by bastilbl via pybombs. PyBombs is a package manager for GNU Radio helping reduce complexity with dependencies.
Zigbee Network Topologies
Three network topologies are supported within the protocol, star, tree, and mesh. Star Topology The network is controlled by a single device called the Zigbee coordinator. All other end devices… Continue Reading
802.11 Co-existence: Trusted Wireless 2.0
Trusted Wireless 2.0 is a proprietary protocol found in industrial environments based on the WirelessHART standard. In the ISM 2.4GHz band, Trusted Wireless 2.0 uses frequency hopping spread spectrum across… Continue Reading
802.11 Co-existence: WirelessHART
WirelessHART is based on the 802.15.4 standard and forms a flat mesh network where each client acts as a source and a repeater. Alternative routes are set up during the… Continue Reading
802.11 Co-existence: 802.15.4 (Zigbee, 6LowPAN, Wireless Hart, MiWi, ISA 100.11a)
802.15.4 is a protocol defined by the IEEE standards body. To have a standard approved by the IEEE, the standards committee must provide a document outlining coexistence assurances for other… Continue Reading
Representational state transfer (REST) – Application Program Interface (API)
REST is a set of conventions used to request information over HTTP. REST requests information from services through stateless communication. When designing a RESTful system, there are 6 constraints used…. Continue Reading
Simple Network Management Protocol (SNMP)
SNMP SNMP is one of the more common management protocols you will find on an enterprise network. It is the default protocol used for monitoring network (and other) infrastructure. SNMP… Continue Reading
gRPC – an open source remote procedure call
a Remote Procedure Call is a program which executes a subroutine in a different computer (or address space), but is programmed in a way where it appears to be local…. Continue Reading