Client TCP

What's this?

This program consists of a client socket & custom messages that send data (hex-string formatted data) to a server (tcp_ipc_server). Then, tcp_ipc_server send this data over LoraWAN (using Radioenge LoRaWAN module). It means using TCP/IP sockets as IPC channel to ensure controlled access to LoRaWAN connectivity. The goals of using this approach to send LoRaWAN data are:

Having a solid and reliable infrastructure to ensure IPC works fine for multiple applications simultaneously
Having the possibility to host different IoT projects and solutions that use LPWAN in a single ESP32
Having the possibility to validate, test and debug multiple IoT projects and solutions at the same time, under the same connectivity conditions (same signal strength, same antenna, same modem/transceiver, etc.)

Both client and server work on local network scope.

How do I use this?

In order to test tcp_ipc_client & tcp_ipc_server together, there are two ways to proceed:

Init server manually (command: SERVER &), and after successfull server init, also init client manually (CLIENT 127.0.0.1)
init server automatically after boot using NuttShell start up scripts (check: https://nuttx.apache.org/docs/latest/applications/nsh/installation.html#nuttshell-start-up-scripts )

Additional info

Both tcp_ipc_client and tcp_ipc_server examples have been full covered in NuttX International Workshop 2022. You can watch the full presentation here: https://www.youtube.com/watch?v=hr0OfTt1KeY The tcp_ipc_server and tcp_ipc_client examples have been developed by Flavio Ipirranga and Pedro Bertoleti from Instituto de Pesquisas Eldorado (IPE) in Brazil.