I’ve recently obtained a prototype Eastron SDM230-LoRa electricity meter. In their datasheet they specify that they are using ASCII as the payload of the LoRaWAN messages. And to make it worse they are adding the serial number, the size of the payload, and a crc into the payload - things that are al…

so when i send downlink message i can leave it 00 00 last 2, right?

if you wish to send commands to the meter, then you will need to send them a valid modbus packet. That means you will need to calculate the CRC as well. Here is an online calculator for that: On-line CRC calculation and free library - Lammert Bies

I absolutely agree with you. It is not best practice by any means and should be avoided.

[image] thucar: While the large packet they send is absolutely unnecessary for LoRaWAN and TTN, I do understand why they have taken this route. They have taken their regular Modbus devices and just added a LoRaWAN wrapper on top of it. So the long packet is in reality just a complete standard mo…

[image] cslorabox: they take the cheap path and let their customers suffer consequences Leaving the way open for their competitors to offer a much more efficient and longer life product at same cost but much lower cost of ownership & life cycle costs, wiping the floor with them an next they k…

@jpmeijers Interesting topic, I needed to look into this one for a customer, reading datasheet says max distance 1.5km. Hoping it’s a mistake and they wanted to write 15km. Reading in datasheet ASCII format afraid me for the second time in less than 5 minutes. So sharing your experience is great …

[image] Charles: I needed to look into this one for a customer, reading datasheet says max distance 1.5km. Hoping it’s a mistake and they wanted to write 15km. Neither number is meaningful; range is completely dependent on conditions

Thank you for your contribution, I have SDM230-LORA that came to me without programming, you can pass some documentation on how to make it report and the Downlink to obtain Step 2.

Good evening, I’m trying to integrate a SDM230-LoRa device to TTN. It would wonderful if we can write down a sort of “wiki” on how to integrate the device to receive information from it. Optimization of the message is not a something we can deal with. Why don’t we cooperate to fill this google do…

[image] fmanghi: It would wonderful if we can write down a sort of “wiki” on how to integrate the device to receive information from it. Why don’t we cooperate to fill this google doc, like a wiki? Yes, yes it would be wonderful, but given the nature of the device it’s not something we reall…

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