The SeeLevel 709-BT is a SeeLevel device which broadcasts tank information over bluetooth. This feature request is to integrate it into the Victron Cerbo GX MK2.
In my Airstream, there is no easy way to get a cable from the wall the Seelevel is in to the Cerbo. It would involve removing most of the kitchen.
Decoding the packets received on bluetooth looks like it is trivially easy [1].
Garnet 709BT BLE Technical Document
The Garnet 709BT hardware supports Bluetooth Low Energy (BLE), and is configured as a Broadcaster transmitting advertisement packets. It continuously cycles through its connected sensors sending out sensor data. No BLE connection is required to read the data, instead the smartphone application implements Receiver functionality to receive these packets.
When the application receives these packets it must decode the Manufacturer Specific Data to determine the Garnet Sensor Data. The first 2 bytes represent a company identifier code.
Company ID 305 Cypress Semiconductor
The following bytes represent the Garnet Sensor Data payload:
Byte 0, 1, 2 Coach ID Unique number - hardware assigned
Byte 3 Sensor Number 0-255
0 = Fresh
1 = Black
2 = Gray
3 = LPG
4 = LPG 2
5 = Galley
6 = Galley 2
7 = Temp
8 = Temp 2
9 = Temp 3
10 = Temp 4
11 = Chemical
12 = Chemical 2
13 = Battery x 10
Byte 4, 5, 6 Sensor Data ascii characters representing data value or sensor status
Byte 7, 8, 9 Sensor Volume
Byte 10, 11, 12 Sensor Total
Byte 13 Sensor Alarm
The link below [1] has code which can be used to read the signals, but the spec above makes it plain how to read them.
Please integrate this so I can display the tanks on my Cerbo GX without having to spend thousands and thousands of dollars trying to run a wire.