Hi,
Main Idea:
I have problems with connection my Hexiwear IoT Device and bluetooth.
My main idea is to have the Hexiwear IoT Device connected via bluetooth to the Raspberry Pi. Then I want to record the sensor data from the IoT Device on the Pi and perhaps also send to a personal cloud (not NXP cloud!).
Hexiwear c-Programm
I run on the Hexiwear the mbed example HEXI_BLE_Exmample which I changed in that way that it only sends constants. E.g. constant battery level = 1, light=2, temperature = 4.
Results on App
I can see on my Gatt-App on my Smartphone that I can read out the parameters battery, light and temperature. The only difference I see on the GattApp is that battery
While the light and temperature: Value is free but the Hex value is given and it is the correct one.
Python Programm for Reading Bluetooth signal
Now I have a small python programme running. I can get the battery level without problems. However, when I want to read out the register values of e.g. the temperature the programme hangs on. I already checked that the UUID is readable. However, I don't get any data.
All works well for the battery, however I don't get any data when reading the temperature value. The programm just hangs up (depending on comments both lines can hang up). No results are shown.
My code is:
`import binascii
import struct
import time
from bluepy import btle
from bluepy.btle import Peripheral
from struct import unpack
print ("Connecting...")
dev = btle.Peripheral("xx:xx:xx:xx:xx:xx")
#Get handles for 2. Variant
characteristics = dev.getCharacteristics()
handles = {}
for characteristic in characteristics:
if characteristic.uuid == "00002a29-0000-1000-8000-00805f9b34fb":
handles["manufacturer"] = characteristic.getHandle()
if characteristic.uuid == "00002012-0000-1000-8000-00805f9b34fb":
handles["temp"] = characteristic.getHandle()
if characteristic.uuid == "00002a19-0000-1000-8000-00805f9b34fb":
handles["battery"] = characteristic.getHandle()
#Read out Battery
battery_handle= dev.getCharacteristics(uuid="2a19")[0]
print("Battery Handle: ", battery_handle)
battery_readable=battery_handle.supportsRead()
print("Battery readable: ", battery_readable)
battery_value = battery_handle.read()
print("Battery Value via read: ", battery_value)
battery_value2=dev.readCharacteristic(handles["battery"])
print("Battery Value via readCharacteristic: ", battery_value2)
#Read out Temperature (in the same way)
temp_handle= dev.getCharacteristics(uuid="2012")[0]
print("Temp Handle: ", temp_handle)
temp_readable=temp_handle.supportsRead()
print("Temperature readable: ", temp_readable)
temp_value = temp_handle.read() #--> hangs on - nothing works
print("Temperature Value via read: ", temp_value)
temp_value2=dev.readCharacteristic(handles["temp"]) # hangs on - nothing workds
print("Temperature Value via readCharacteristic: ", temp_value2)
dev.disconnect`
So my question is:
What do I have to change in order to read out my personal data from the hexiwear IoT e.g. temperature to my raspberry pi running with my Python Script?
Thanks a lot
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