Hello Raspberry Pi

It's a simple Python example using pybluez extension module, run on Raspberry Pi 4/Raspberry Pi OS, to communicate with ESP32 SerialToSerialBT example.

pybluez (or https://github.com/pybluez/pybluez)is a Python extension module allowing access to system Bluetooth resources.

Install pybluez for Python3, enter the command in Terminal:

$ sudo pip3 install pybluez

Copy and modify pybluez/examples/simple/rfcomm-client.py in Raspberry Pi Thonny.

It's my modified version, pyBTSimpleClient.py

from bluetooth import *
def input_and_send():
 print("\nType something\n")
 while True:
 data = input()
 if len(data) == 0: break
 sock.send(data)
 sock.send("\n")
 
def rx_and_echo():
 sock.send("\nsend anything\n")
 while True:
 data = sock.recv(buf_size)
 if data:
 print(data)
 sock.send(data)
 
#MAC address of ESP32
addr = "24:0A:C4:E8:0F:9A"
#uuid = "94f39d29-7d6d-437d-973b-fba39e49d4ee"
#service_matches = find_service( uuid = uuid, address = addr )
service_matches = find_service( address = addr )
buf_size = 1024;
if len(service_matches) == 0:
 print("couldn't find the SampleServer service =(")
 sys.exit(0)
for s in range(len(service_matches)):
 print("\nservice_matches: [" + str(s) + "]:")
 print(service_matches[s])
 
first_match = service_matches[0]
port = first_match["port"]
name = first_match["name"]
host = first_match["host"]
port=1
print("connecting to \"%s\" on %s, port %s" % (name, host, port))
# Create the client socket
sock=BluetoothSocket(RFCOMM)
sock.connect((host, port))
print("connected")
#input_and_send()
rx_and_echo()
sock.close()
print("\n--- bye ---\n")

How it run on Raspberry Pi 4/Raspberry Pi OS, communicate with ESP32 (ESP32-DevKitC V4) SerialToSerialBT example. The code in ESP32 side is in my another blog Arduino-er: ESP32 Bluetooth serial example.
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