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My goal is to send a string from an Arduino via an HM-10 bluetooth module to a Rasperry Pi. I do this today by connecting the HM-10 on the Arduino to another HM-10 module (master/slave) and then from that module to the Raspberry Pi via USB Serial adapter which gives me a /dev/ttyUSB0 that I can read. I would like to just have the Arduino's HM-10 connect up directly to the Bluetooth of the Raspberry Pi without any extra modules at all.

I found the app "Arduino Bluetooth Controller" (Android) that can connect to the module and serial communication is working.

I also have the HC-05 module and there I can solve it by using rfcomm bind 2 , but that doesn't work on the HM-10.

I'm open to any solution that can do this. Either bind the serial communication using rfcomm (or alternative) like on the HC-05, or try to build an app that is doing the same thing the Android app does, only on the Raspberry Pi.

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HM-10 is a BLE device. You'll need to understand BLE programming, which is quite different than classic Bluetooth. There is no standard BLE service for serial communication. The best way on a Pi to use BLE is with the

If you are fit in Phyton: The HM-10 style device will send notifications that the Pi's BLE device can read. Basically you need to attach a 'delegate' call-back function to the Peripheral object, and then wait for notifications. The call-back can then process the received data. You'll have to install the bluepy lib on the PI. This sample code writes to an Arduino HC-10 device

import bluepy.btle as btle

p = btle.Peripheral("AA:BB:CC:DD:EE:FF")
s = p.getServiceByUUID("0000ffe0-0000-1000-8000-00805f9b34fb")
c = s.getCharacteristics()[0]

c.write(bytes("Hello world\n", "utf-8"))
p.disconnect()   

Here is some code for reading from an Arduino HC-10 device

import bluepy.btle as btle

class ReadDelegate(btle.DefaultDelegate):
    def handleNotification(self, cHandle, data):
        print(data.decode("utf-8"))

p = btle.Peripheral("AA:BB:CC:DD:EE:FF")
p.withDelegate(ReadDelegate())

while True:
    while p.waitForNotifications(1):
        pass

p.disconnect()
| improve this answer | |
  • I ended up using bluepy like in your example and with some chunking of the incoming data (seems to be a 20 byte limit) it all works great! Thank you! – miccet Apr 15 at 22:07

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