Minimalist Arduino interactive shell

Small interactive shell via Serial interface, written in C++ for ESP32 and ESP8266, based on the command pattern.

This library makes it possible to define commands, and execute them directly over Serial:

Console is ready!
> test
'test' not supported. Available commands :
  double 123 (Doubles value).
  led 1/0 (LED on/off).
  reset (restarts the microcontroller).
> led 1
Calling : led(1)
> led 0
Calling : led(0)
> double 12345
Calling : double(12345)
12345 * 2 = 24690
> double
'double' not supported. Available commands :
  double 123 (Doubles value).
  led 1/0 (LED on/off).
  reset (restarts the microcontroller).
> reset
Calling : reset()

Commands could also be sent via web interface or MQTT.

The corresponding libraries just need to #include 'command_invoker.h', and can be independent from each others.

Hardware Requirements

• ESP8266 or ESP32 microcontroller (this project has been tested with ESP8266 ESP-12 WIFI and TTGO ESP32 SX1276 LoRa)

Software Requirements

• PlatformIO or
• Arduino IDE

Installation

PlatformIO

PlatformIO can be run from VSCODE, Eclipse CDT or console:

make upload board=esp8266 && make monitor # For ESP8266

make upload board=esp32 && make monitor # For ESP32

Arduino IDE

• Add your board to the board manager. Either ESP8266:

    http://arduino.esp8266.com/stable/package_esp8266com_index.json
  

  or ESP32:

    https://dl.espressif.com/dl/package_esp32_index.json
  

• Choose the correct board in Tools > Board > ...

• Choose the correct Flash size (e.g. "Flash Size : 4MB (1MB FS, OTA:~1019kB)" for ESP8266 ESP-12 WIFI)

• Verify

• Upload

• Tools > Serial Monitor

Usage

Once the microcontroller runs, commands can be sent directly from Arduino IDE Serial Monitor or PlatformIO monitor.

If an unknown command is sent via Serial, a list of known commands will be displayed.

If a command expects an integer, trying to call it without argument will not run anything.

Console is ready!
> double 456
Calling : double(456)
456 * 2 = 912
> double
'double' not supported. Available commands :
  double 123 (Doubles the input value).
  led 1/0 (LED on/off).
  reset (restarts the microcontroller).
> led 0
Calling : led(0)
> reset
Calling : reset()
ets Jun  8 2016 00:22:57

rst:0xc (SW_CPU_RESET),boot:0x17 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:2
load:0x3fff0018,len:4
load:0x3fff001c,len:1044
load:0x40078000,len:8896
load:0x40080400,len:5828
entry 0x400806ac
Calling : led(1)
Console is ready!
>

Commands can also be run directly from C++ code, e.g. with string literals:

command_invoker::execute("led 1");

or from a webserver query string (be careful!):

void handleWebServerCommand() {
  if (!shouldBeAllowed()) {
    return http.requestAuthentication(DIGEST_AUTH);
  }
  http.sendHeader("Location", "/");
  http.send(303);
  command_invoker::execute(http.arg("send").c_str());
}

Adding commands

It is possible to add new commands by including 'command_invoker.h' and calling:

command_invoker::defineCommand("command_name", voidFunctionName, F(" (documentation)"));
command_invoker::defineIntCommand("command_name", intFunctionName, F(" parameter (documentation)"));

For example:

sensor_console::defineCommand("free", util::showFreeSpace, F(" (Displays available heap space)"));
sensor_console::defineIntCommand("set_time", ntp::setLocalTime, F(" 1618829570 (Sets time to the given UNIX time)"));

License

Copyright © 2021, Eric Duminil

GPLv3