⚗️ #2 socketio connection with ESP32 - Failed.

System/ESP32_communicator/socketio-async-send.py

@@ -0,0 +1,82 @@
+import socketio
+import asyncio
+
+# Async client
+sio = socketio.AsyncClient(logger=True, engineio_logger=True)
+
+# Registering event handlers
+@sio.event
+def connect():
+    print("I'm connected!")
+
+@sio.event
+def connect_error(data):
+    print("The connection failed!")
+
+@sio.event
+def disconnect():
+    print("I'm disconnected!")
+
+# connect to the server
+async def establish_conn():
+    await sio.connect("ws://192.168.147.165:82")
+    print("sid: ",sio.sid)
+    # return sio.sid  # assigned socket-id by the server
+
+## Other handlers
+async def onkeypress(event):
+    print(event.name)
+    await sio.send(event.name)
+
+async def transfer_data():
+    while True:
+        # Do-nothing loop. Just use to wait, until force-closed with ctrl+c
+        data = input("Enter data to send (type 'END' to quit): ")
+        if data != 'END':
+            await sio.send(data=data)
+            print("ACK: sent successfully.")
+        else:
+            break
+
+if __name__ == '__main__':
+    # Establish connection with the server..
+    # task = asyncio.create_task(establish_conn())
+    # asyncio.new_event_loop().run_until_complete(establish_conn())
+    # task = asyncio.create_task(establish_conn())
+    # await task
+    # task = sio.start_background_task(establish_conn)
+    asyncio.run(establish_conn())
+    asyncio.run(transfer_data())
+
+
+"""
+Log on 18th June 2023 - Sunday.
+
+
+[arjuna@kurukshetra ESP32_communicator]$ python socketio-async-send.py 
+Attempting polling connection to http://192.168.147.165:82/socket.io/?transport=polling&EIO=3
+Traceback (most recent call last):
+  File "/run/media/arjuna/WorkAndWorkResources/Work/Projects/MajorProject/SelfDrivingCar/System/ESP32_communicator/socketio-async-send.py", line 48, in <module>
+    asyncio.run(establish_conn())
+  File "/usr/lib/python3.10/asyncio/runners.py", line 44, in run
+    return loop.run_until_complete(main)
+  File "/usr/lib/python3.10/asyncio/base_events.py", line 649, in run_until_complete
+    return future.result()
+  File "/run/media/arjuna/WorkAndWorkResources/Work/Projects/MajorProject/SelfDrivingCar/System/ESP32_communicator/socketio-async-send.py", line 22, in establish_conn
+    await sio.connect("ws://192.168.147.165:82")
+  File "/home/arjuna/.local/lib/python3.10/site-packages/socketio/asyncio_client.py", line 109, in connect
+    await self.eio.connect(url, headers=headers,
+  File "/home/arjuna/.local/lib/python3.10/site-packages/engineio/asyncio_client.py", line 101, in connect
+    return await getattr(self, '_connect_' + self.transports[0])(
+  File "/home/arjuna/.local/lib/python3.10/site-packages/engineio/asyncio_client.py", line 214, in _connect_polling
+    r.status), await r.json())
+  File "/home/arjuna/.local/lib/python3.10/site-packages/aiohttp/client_reqrep.py", line 1104, in json
+    raise ContentTypeError(
+aiohttp.client_exceptions.ContentTypeError: 0, message='Attempt to decode JSON with unexpected mimetype: text/plain', url=URL('http://192.168.147.165:82/socket.io/?transport=polling&EIO=3&t=1687081526.5948737')
+
+
+
+Conclusion:
+As per socketio docs, it first establishes connection with the help of HTTP, then switches the protocol to websocket.
+But ESP32 was not ready for that. Its on plain websockets.
+"""

System/ESP32_communicator/test_keyboard_press.py

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+# src: https://stackoverflow.com/a/44754161
+# import keyboard  # using module keyboard
+
+# while True:  # making a loop
+#     print("waiting to press 'q'")
+
+#     # try:  # used try so that if user pressed other than the given key error will not be shown
+#     if keyboard.is_pressed('q'):  # if key 'q' is pressed 
+#         print('You Pressed A Key!')
+#         break  # finishing the loop
+#     # except:
+#     #     break  # if user pressed a key other than the given key the loop will break
+
+# if this doesn't work, try: https://stackoverflow.com/a/54239261
+
+import keyboard    
+def onkeypress(event):
+    print(event.name)
+
+keyboard.on_press_key('left', onkeypress)
+
+#Use ctrl+c to stop
+while True:
+    pass