RAK7200 node, GPS tracker

JeroenKl · October 16, 2019, 4:53am

Same for me.
Also updated the bootloader.
Unfortunately the battery read-out is gone in de serial logger.

Henning · October 20, 2019, 9:16pm

Does anyone know where a payload-decode can be found?

I’t doesn’t make any sense that everyone has to invent the wheel to get access to our data

Fomi · October 21, 2019, 1:25am

Hi @Henning,

https://doc.rakwireless.com/rak7200-lora-tracker/analyzing-the-data-from-rak7200

Henning · October 21, 2019, 9:07am

Yep. I’ve seen that page and others like it, but I wunder why you ( or someone else ) haven’t published e decoder-function for copy-pasting to the ttn-console.

Well. I’d better publish my own, when I (re) invert it.

/Henning

Ernestas · October 21, 2019, 9:48am

Agree. I have tried to decode RAK7204 my self with documentation but code looks bulky and unclear and i’m not confident to post it for other to use.

Henning · October 21, 2019, 10:26am

And contain multible errors

Wrong values, wrong labels.

Better look closely and try to validate data from “trusted” sources before using it in real.

PabloG · October 21, 2019, 10:38am

I have a similar problem, I posted but nobody answer.
I have a RAK7249. When the RAK7200 tracker send Payload, they are total different that they must be as RAK packet decode say.
I get:
02 C0 04 29 BD F5 CF B9 DB 7A 2F 9B 70 5D 6E 89 E6 4E A9 51 DC DA EB F4 47 A1 64 7C F7 D5 70 55 27 7B 17 76 30 6A 68

instead of:
018805378F109D590103CE080201750371FF000000FE000586FFFD0000000104020143FF
6C005F0673253202670139

(Both of this are only examples one from my data, other from PDF of RAK, they don’t match in length)

Then I tried to send a little data from the RAK SERIAL PROTOCOL TOOL
I sent several times:
at+send=lora:1:018805378F109D59
and get different payloads:
01 53 4B 34 66 D7 1F E7
01 AF 4F 89 E4 24 55 9A
01 E6 17 F3 00 4C 02 52

Then I sent in other port:
at+send=lora:2:018805378F109D59
and get:
02 70 99 7A C1 08 CD 22
02 3E 76 FD AD 43 EF B7

Any explanation of this?

JeroenKl · October 21, 2019, 4:45pm

Is this correct? As still the temp and pressure sensor is mentioned but it is not available in the 7200?

ZhuQI · October 22, 2019, 1:43am

Where did you see the data in RAK7249?

PabloG · October 22, 2019, 11:08am

In the inbuild lora server

Nicholas · October 23, 2019, 1:36am

The data you receive is base64 data, not hex, you can switch this piece to hex, and then try again.

Aks666 · October 23, 2019, 11:08am

I have issue regarding GPS accuracy.
My device is updated with latest firmware still I am not getting accurate GPS location.
Please reply if anyone facing similar issues

Fomi · October 25, 2019, 2:42am

Sorry for late.
The new document has been updated here:
https://doc.rakwireless.com/rak7200-lora-tracker/analyzing-the-data-from-rak7200

Fomi · October 25, 2019, 4:06am

Hi @Aks666,

Sorry for late reply.
Can you please turn off the sleep mode so that GPS module will not be power off and try again?
As i know, the GPS accuracy issue has been fixed. More details you can have a look at the above messages in this topic.

Aks666 · October 25, 2019, 7:34am

i am using TTN server, so TTN itself giving me converted values.

Aks666 · October 25, 2019, 7:45am

thanks for the reply.
I have disabled the sleep mode and the gps_timeout is 100.
Still i am not getting accurate GPS location.
Can you please tell me the GPS accuracy in radius.
Thanks again!!!

Fomi · October 25, 2019, 7:55am

As we tested, the GPS accurate is around 10 meters.

JeroenKl · October 25, 2019, 8:27am

I can confirm the result and findings of @Fomi

PabloG · October 25, 2019, 3:49pm

I know that the difference is on the negative, but I can’t found how to convert.
If anyone help me…
Thanks

jchonig · October 25, 2019, 6:12pm

The data is in the standard Cayenne LPP format, here’s a link to the packet format.

You also need to factor in that the data is encoded in base64 in the packet.