Wireless M-Bus Range Extender /
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User Manual Version 1.0
Page 15 of 32
Upload of captured Wireless M-Bus Packets
The upload of captured Wireless M-Bus packets can be started by means of a calendar event. Due to the small payload capacity of
LoRaWAN packets a complete Wireless M-Bus packet may require more than one LoRaWAN uplink packet. A reliable upload is ensured
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by confirmed LoRaWAN uplink packets and a simple segmentation protocol with minimal overhead of one Byte. The protocol supports
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both, spreading of WM-Bus packets over multiple LoRaWAN® packets and transmitting of multiple WM-Bus packets in a single LoRaWAN®
packet.
Figure : Wireless M-Bus Packet Upload
Every recorded Wireless M-Bus packet is transmitted starting with a 32-Bit UTC timestamp which indicates the time of reception. The
following Wireless M-Bus packet itself starts with an 8-Bit Length-Field which indicates the size of the following message.
Figure: Wireless M-Bus Message Format
