Byte order of data in LoRa packets sent by IUWS water meter
Hello,
On the document “Lora radio packet definitions” v1.34, it states that big endian is used (chap 2.2, “If not specified differently, byte order will be MSB first.”)
And on the “IUW-IUWS User guide for system integrators” v1.9, there are some LoRa packet examples on page 41. And in these, it appears that little endian is used to encode the water meter data.
But I cannot find anywhere written that the water meter sends its values in little endian. It does match the payloads we are receiving, so most likely it is little endian. However, I have a doubt about the timestamp and the state stamps. Are they sent also in little endian ? Or is big endian used ? Because the examples on page 41 do not show the decoded value of the timestamps.
- 3 Replies
Hi Nelson, if no other member will respond to this question soon who may already have experience with this: Due to the fact that we cannot deliver here real support, the best way would be to contact the ZENNER Support at support@zenner.com. Here for sure you will get the needed answer. Afterwards, it would be awesome if you can maybe share the answer here with the others.
Warm regards 🙋♂️
After trying to decode some of the payloads, it is clear that little endian is used everywhere.
But its suprising that the manual says it uses big endian.
Hi there, thank you for sharing this valuable feedback.
Regarding the document “Lora radio packet definitions” the crucial phrase in chap 2.2 is “If not specified differently”. So it can differ here indeed for certain devices.
Nevertheless, there does indeed seem to be some room for improvement here with regard to this information in the documents. We have therefore forwarded this feedback again, in case you have not already been in contact with ZENNER Support about that.
Warm regards 🙋♂️
Log in to reply.