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+--- Thread: Ruuvitag BLE integration (/showthread.php?tid=2651)
Ruuvitag BLE integration - Papru - 22.05.2020
Hi,
has anyone tried to integrate these BLE temperature/humidity/pressure sensors with LM5? https://ruuvi.com/
I have BLE dongle in LM5 and it seems that it found those Ruuvitags but if I try to read response from it, it just gives *nil to log or says that error in connection.
Here is specs for ruuvitag data: Ruuvitag dataformat
This is script that I used for connecting to Ruuvi:
require('ble')
ble.up()
sock = ble.sock()
res,err=ble.settimeout(sock, 15)
res,err,errno = ble.connect(sock,"f7:14:56:d0:33:d5")
if res then
rx = ble.sockreadhnd(sock, 0x0499)
log(rx)
end
log(res,err,errno)
ble.close(sock)
Script that I used for scan BLE devices:
require('ble')
-- enable ble
ble.up()
list = {}
-- mac -> group address mapping
known = {
['f7:14:56:d0:33:d5'] = '9/1/1',
['CD:F5:C0:A2:F4:4C'] = '9/1/2',
}
ctime = os.time()
function callback(addr)
local now, delta
now = os.time()
delta = now - ctime
if addr then
if not list[ addr ] then
log('BLE found ' .. addr)
if known[ addr ] then
grp.write(known[ addr ], true, dt.bool)
end
end
list[ addr ] = now
end
-- check for missing devices each 5 seconds
if delta < 0 or delta > 5 then
for addr, time in pairs(list) do
delta = now - time
if delta < 0 or delta > 60 then
log('BLE missing ' .. addr)
list[ addr ] = nil
if known[ addr ] then
grp.write(known[ addr ], false, dt.bool)
end
end
end
ctime = now
end
end
ble.scan(callback)
RE: Ruuvitag BLE integration - admin - 22.05.2020
The sensor uses BLE advertising packets to send data. This means that you do not need to connect to it and just parse the advertising packet data.
Run this script and post what you get in logs tab. You might need to disable it quickly if there are many packets sent.
Code:
require('ble')
-- enable ble
ble.up()
function callback(addr, name, rssi, data)
if addr then
log(addr)
loghex(data)
end
end
ble.scan(callback)RE: Ruuvitag BLE integration - Papru - 22.05.2020
Hi,
I added that script (added also to log rssi value) and it gave this:
Test_ble_adv 22.05.2020 14:28:08
* string: F7:14:56
0:335Test_ble_adv 22.05.2020 14:28:08
* number: -35
Test_ble_adv 22.05.2020 14:28:08
* nil
That is right address for Ruuvitag (log showed lots of other BLE devices too) but data is * nil
RE: Ruuvitag BLE integration - admin - 22.05.2020
Which FW version are you running?
RE: Ruuvitag BLE integration - Papru - 22.05.2020
HW: LM5 Lite + Ext (i.MX6)
SW: 20180822
RE: Ruuvitag BLE integration - admin - 22.05.2020
Ok, and what is luable package version?
RE: Ruuvitag BLE integration - Papru - 22.05.2020
20151208
RE: Ruuvitag BLE integration - admin - 22.05.2020
Install these packages and try the script again:
https://dl.openrb.com/lm-18-imx6/pkg/libbluetooth_5.49-1_imx6.ipk
https://dl.openrb.com/lm-18-imx6/pkg/luable_20180424_imx6.ipk
RE: Ruuvitag BLE integration - Papru - 22.05.2020
Thanks!
Now I got this:
Test_ble_adv 22.05.2020 15:42:18
* string: F7:14:56
0:335Test_ble_adv 22.05.2020 15:42:18
* number: -35
Test_ble_adv 22.05.2020 15:42:18
* hexstring [21]: 02 01 06 11 FF 99 04 03 38 15 17 C8 38 00 0B 00 02 04 10 0B A1
Next step is parse right data from there. I think that real data what Im looking for starts after FF 99 04. From spec manual : "The data is decoded from "Manufacturer Specific Data" -field, for more details please check this article out. Manufacturer ID is 0x0499."
If I look that spec for payload then:
03 = Data format definition
38 = Humidity ( 38 hex = 56 dec -> 56/2 = 28% )
15 = temperature. 15 hex = 21 celsius
17 = decimals of temperature -> 17 hex = 23
Those all are right values and same as in app (these ruuvitags have own android app for reading values).
Do you have little example script for parsing those parts from data?
RE: Ruuvitag BLE integration - admin - 22.05.2020
Like this. Keep in mind that it does not handle negative temperature correctly.
Code:
humidity = data:byte(9) / 2
temperature = data:byte(10) + data:byte(11) / 100RE: Ruuvitag BLE integration - Papru - 22.05.2020
Thanks a lot!
I need to check that negative temperature because one ruuvitag will be outside. Another one will be in sauna. Alexa notifies me when temperature in sauna is high enough (via Node-red)
I did this with before with node-red but it wasnt stable enough. It needed to restart flow once a week. This LM integration might be more stable solution.
RE: Ruuvitag BLE integration - admin - 24.05.2020
Use this to handle negative temperature correctly:
Code:
temperature = data:byte(10)
decimals = data:byte(11) / 100
if bit.band(temperature, 0x80) == 0x80 then
temperature = -bit.band(temperature, 0x7F)
temperature = temperature - decimals
else
temperature = temperature + decimals
end