Modified tcp_gateway for packet length management

Author: MrYsLab

python_banyan/utils/tcp_gateway/Running_Demos.md

@@ -1,26 +1,16 @@
 # Running The Demos
 
-There are two demos available. Currently, data can only be sent in one 
-direction at a time since I have not figured out how to perform concurrency in 
-MicroPython.  The threading 
-library is said to be experimental. However, I did locate [this code](https://github.com/fadushin/esp8266/blob/790958fa332592c80a0f81f25cdaa9513d596f64/micropython/uhttpd/uhttpd/__init__.py#L354) which may solve 
-the concurrency issue. I have yet to have a chance to see if the code works.
+A demo is available to run data end-to-end in both directions.
 
-## Sending Messages To The Local Simulated Server From The Pico
-Here are the steps used:
-
-1. Start the backplane.
-2. Start the [messages_from_pico.py](https://github.com/MrYsLab/python_banyan/blob/tcp_gateway/python_banyan/utils/tcp_gateway/pico_micropython_scripts/messages_from_pico.py) MicroPython script.
-3. Start [sim_messages_from_pico.py](https://github.com/MrYsLab/python_banyan/blob/tcp_gateway/python_banyan/utils/tcp_gateway/simulated_local_station/sim_messages_from_pico.py)
-4. Start the [tcp_gateway.py](https://github.com/MrYsLab/python_banyan/blob/tcp_gateway/python_banyan/utils/tcp_gateway/tcp_gateway.py)
-
-You should see the messages if you look at the console window for sim_messages_from_pico.py.
+The TCP Gateway will continually attempt to connect to the Pico.
 
+## Steps
+Here are the steps used:
 
-## Sending Messages From the Local Simulated Server To The Pico
 1. Start the backplane.
-2. Start the [messages_to_pico.py](https://github.com/MrYsLab/python_banyan/blob/tcp_gateway/python_banyan/utils/tcp_gateway/pico_micropython_scripts/messages_to_pico.py) MicroPython script.
-3. Start the [tcp_gateway.py](https://github.com/MrYsLab/python_banyan/blob/tcp_gateway/python_banyan/utils/tcp_gateway/tcp_gateway.py)
-4. Start the [sim_messages_to_pico.py](https://github.com/MrYsLab/python_banyan/blob/tcp_gateway/python_banyan/utils/tcp_gateway/simulated_local_station/sim_messages_to_pico.py) script.
+2. Start the [tcp_gateway.py](https://github.com/MrYsLab/python_banyan/blob/tcp_gateway/python_banyan/utils/tcp_gateway/tcp_gateway.py)
+3. Load and start the [select.py](https://github.com/MrYsLab/python_banyan/blob/master/python_banyan/utils/tcp_gateway/pico_micropython_scripts/select.py) MicroPython script on the Raspberry Pi Pico W
+4. Start [sim_echo_client.py](https://github.com/MrYsLab/python_banyan/blob/master/python_banyan/utils/tcp_gateway/simulated_local_station/sim_echo_client.py)
 
-Check the Thonny shell for incoming messages.
+The messages appear in the sim_echo_client console and on the MicroPython 
+Thonny shell.