Initial commit

.clang-format

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+# -*- yaml -*-
+
+---
+BasedOnStyle:                                    WebKit
+IndentWidth:                                     4
+---
+Language:                                        Cpp
+
+AlignAfterOpenBracket:                           Align
+AlignEscapedNewlines:                            Left
+AlignOperands:                                   Align
+AlignTrailingComments:                           true
+
+AllowAllArgumentsOnNextLine:                     false
+AllowAllConstructorInitializersOnNextLine:       true
+AllowAllParametersOfDeclarationOnNextLine:       false
+AllowShortLambdasOnASingleLine:                  All
+
+AlwaysBreakTemplateDeclarations:                 Yes
+IndentPPDirectives:                              BeforeHash
+
+BraceWrapping:
+  AfterEnum:                                     false
+  AfterFunction:                                 true
+  BeforeCatch:                                   true
+  BeforeElse:                                    true
+  BeforeLambdaBody:                              false
+  SplitEmptyRecord:                              false
+BreakBeforeBraces:                               Custom
+BreakInheritanceList:                            BeforeComma
+
+SpaceAfterTemplateKeyword:                       false
+SpaceInEmptyBlock:                               false
+NamespaceIndentation:                            None
+FixNamespaceComments:                            true
+Standard:                                        c++20
+TabWidth:                                        4
+UseTab:                                          AlignWithSpaces
+...

README.org

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+* Powerbutton
+
+** Init
+
+platformio init --board esp32-c3-devkitm-1
+
+** Build
+
+platformio run
+
+** Upload
+
+platformio run --target upload
+
+** Console
+
+platformio device monitor

client/.gitignore

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+.pio
+
+src/secrets.h

client/include/README

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+
+This directory is intended for project header files.
+
+A header file is a file containing C declarations and macro definitions
+to be shared between several project source files. You request the use of a
+header file in your project source file (C, C++, etc) located in `src` folder
+by including it, with the C preprocessing directive `#include'.
+
+```src/main.c
+
+#include "header.h"
+
+int main (void)
+{
+ ...
+}
+```
+
+Including a header file produces the same results as copying the header file
+into each source file that needs it. Such copying would be time-consuming
+and error-prone. With a header file, the related declarations appear
+in only one place. If they need to be changed, they can be changed in one
+place, and programs that include the header file will automatically use the
+new version when next recompiled. The header file eliminates the labor of
+finding and changing all the copies as well as the risk that a failure to
+find one copy will result in inconsistencies within a program.
+
+In C, the convention is to give header files names that end with `.h'.
+
+Read more about using header files in official GCC documentation:
+
+* Include Syntax
+* Include Operation
+* Once-Only Headers
+* Computed Includes
+
+https://gcc.gnu.org/onlinedocs/cpp/Header-Files.html

client/lib/README

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+
+This directory is intended for project specific (private) libraries.
+PlatformIO will compile them to static libraries and link into the executable file.
+
+The source code of each library should be placed in a separate directory
+("lib/your_library_name/[Code]").
+
+For example, see the structure of the following example libraries `Foo` and `Bar`:
+
+|--lib
+|  |
+|  |--Bar
+|  |  |--docs
+|  |  |--examples
+|  |  |--src
+|  |     |- Bar.c
+|  |     |- Bar.h
+|  |  |- library.json (optional. for custom build options, etc) https://docs.platformio.org/page/librarymanager/config.html
+|  |
+|  |--Foo
+|  |  |- Foo.c
+|  |  |- Foo.h
+|  |
+|  |- README --> THIS FILE
+|
+|- platformio.ini
+|--src
+   |- main.c
+
+Example contents of `src/main.c` using Foo and Bar:
+```
+#include <Foo.h>
+#include <Bar.h>
+
+int main (void)
+{
+  ...
+}
+
+```
+
+The PlatformIO Library Dependency Finder will find automatically dependent
+libraries by scanning project source files.
+
+More information about PlatformIO Library Dependency Finder
+- https://docs.platformio.org/page/librarymanager/ldf.html

client/platformio.ini

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+; PlatformIO Project Configuration File
+;
+;   Build options: build flags, source filter
+;   Upload options: custom upload port, speed and extra flags
+;   Library options: dependencies, extra library storages
+;   Advanced options: extra scripting
+;
+; Please visit documentation for the other options and examples
+; https://docs.platformio.org/page/projectconf.html
+
+[env:esp32-c3-devkitm-1]
+platform = espressif32
+board = esp32-c3-devkitm-1
+board_build.mcu = esp32c3
+framework = arduino
+
+build_flags =
+  -DARDUINO_USB_CDC_ON_BOOT=1
+  -DARDUINO_USB_MODE=1
+  -DARDUINO_TINYUSB=1
+  -DCORE_DEBUG_LEVEL=5 ; set the debug level (0-5, with 5 being the most verbose)
+
+lib_deps =
+
+monitor_filters =
+    esp32_exception_decoder
+    time ; add timestamp with milliseconds for each new line

client/src/main.cpp

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+#include <Arduino.h>
+#include <WiFi.h>
+#include <WiFiClient.h>
+
+#include "secrets.h"
+
+// Default IP address = 192.168.4.1
+
+#define HOST "192.168.4.1"
+#define PORT 1234
+
+void setup()
+{
+	Serial.begin(9600);
+	Serial.setDebugOutput(true);
+
+	pinMode(2, OUTPUT);
+
+	// Wait for a USB connection to be established
+	while (!Serial)
+		(void)0;
+	delay(1000);
+	Serial.println("Client booted!");
+
+	// Connect to button server
+	WiFi.begin(SSID, PASSWORD);
+	Serial.print("Connecting");
+	while (WiFi.status() != WL_CONNECTED) {
+		delay(500);
+		Serial.print(".");
+	}
+	Serial.println("\nConnected to AP");
+}
+
+void loop()
+{
+	digitalWrite(2, HIGH);
+	delay(500);
+	digitalWrite(2, LOW);
+	delay(500);
+
+	Serial.println("ESP32 loopy!");
+
+	WiFiClient client;
+	if (client.connect(HOST, PORT)) {
+		client.print("button_pressed\n");
+		Serial.println("Sent button press");
+
+		while (client.connected()) {
+			if (client.available()) {
+				// Wait for acknowledgment from the receiver
+				String response = client.readStringUntil('\n');
+				if (response == "ACK") {
+					Serial.println("Received ACK");
+					break;
+				}
+			}
+		}
+
+		delay(2000);
+		client.stop();
+	}
+	else {
+		Serial.println("Connection failed");
+	}
+}

client/src/secrets.h.example

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+#pragma once
+
+#define SSID "EXAMPLE"
+#define PASSWORD "12345678"

client/test/README

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+
+This directory is intended for PlatformIO Test Runner and project tests.
+
+Unit Testing is a software testing method by which individual units of
+source code, sets of one or more MCU program modules together with associated
+control data, usage procedures, and operating procedures, are tested to
+determine whether they are fit for use. Unit testing finds problems early
+in the development cycle.
+
+More information about PlatformIO Unit Testing:
+- https://docs.platformio.org/en/latest/advanced/unit-testing/index.html

makefile

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+.PHONY: server server-log server-run client client-log client-run
+
+server:
+	@-cd server ; \
+		platformio run --target upload ; \
+		cd ..
+
+server-log:
+	@-cd server ; \
+		platformio device monitor ; \
+		cd ..
+
+server-run:
+	@-cd server ; \
+		platformio run --target upload ; \
+		platformio device monitor ; \
+		cd ..
+
+client:
+	@-cd client ; \
+		platformio run --target upload ; \
+		cd ..
+
+client-log:
+	@-cd client ; \
+		platformio device monitor ; \
+		cd ..
+
+client-run:
+	@-cd client ; \
+		platformio run --target upload ; \
+		platformio device monitor ; \
+		cd ..

server/.gitignore

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+.pio
+
+src/secrets.h

server/include/README

@@ -0,0 +1,37 @@
+
+This directory is intended for project header files.
+
+A header file is a file containing C declarations and macro definitions
+to be shared between several project source files. You request the use of a
+header file in your project source file (C, C++, etc) located in `src` folder
+by including it, with the C preprocessing directive `#include'.
+
+```src/main.c
+
+#include "header.h"
+
+int main (void)
+{
+ ...
+}
+```
+
+Including a header file produces the same results as copying the header file
+into each source file that needs it. Such copying would be time-consuming
+and error-prone. With a header file, the related declarations appear
+in only one place. If they need to be changed, they can be changed in one
+place, and programs that include the header file will automatically use the
+new version when next recompiled. The header file eliminates the labor of
+finding and changing all the copies as well as the risk that a failure to
+find one copy will result in inconsistencies within a program.
+
+In C, the convention is to give header files names that end with `.h'.
+
+Read more about using header files in official GCC documentation:
+
+* Include Syntax
+* Include Operation
+* Once-Only Headers
+* Computed Includes
+
+https://gcc.gnu.org/onlinedocs/cpp/Header-Files.html

server/lib/README

@@ -0,0 +1,46 @@
+
+This directory is intended for project specific (private) libraries.
+PlatformIO will compile them to static libraries and link into the executable file.
+
+The source code of each library should be placed in a separate directory
+("lib/your_library_name/[Code]").
+
+For example, see the structure of the following example libraries `Foo` and `Bar`:
+
+|--lib
+|  |
+|  |--Bar
+|  |  |--docs
+|  |  |--examples
+|  |  |--src
+|  |     |- Bar.c
+|  |     |- Bar.h
+|  |  |- library.json (optional. for custom build options, etc) https://docs.platformio.org/page/librarymanager/config.html
+|  |
+|  |--Foo
+|  |  |- Foo.c
+|  |  |- Foo.h
+|  |
+|  |- README --> THIS FILE
+|
+|- platformio.ini
+|--src
+   |- main.c
+
+Example contents of `src/main.c` using Foo and Bar:
+```
+#include <Foo.h>
+#include <Bar.h>
+
+int main (void)
+{
+  ...
+}
+
+```
+
+The PlatformIO Library Dependency Finder will find automatically dependent
+libraries by scanning project source files.
+
+More information about PlatformIO Library Dependency Finder
+- https://docs.platformio.org/page/librarymanager/ldf.html

server/platformio.ini

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+; PlatformIO Project Configuration File
+;
+;   Build options: build flags, source filter
+;   Upload options: custom upload port, speed and extra flags
+;   Library options: dependencies, extra library storages
+;   Advanced options: extra scripting
+;
+; Please visit documentation for the other options and examples
+; https://docs.platformio.org/page/projectconf.html
+
+[env:esp32-c3-devkitm-1]
+platform = espressif32
+board = esp32-c3-devkitm-1
+board_build.mcu = esp32c3
+framework = arduino
+
+build_flags =
+  -DARDUINO_USB_CDC_ON_BOOT=1
+  -DARDUINO_USB_MODE=1
+  -DARDUINO_TINYUSB=1
+  -DCORE_DEBUG_LEVEL=5 ; set the debug level (0-5, with 5 being the most verbose)
+
+lib_deps =
+
+monitor_filters =
+    esp32_exception_decoder
+    time ; add timestamp with milliseconds for each new line

server/src/main.cpp

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+#include <Arduino.h>
+#include <WiFi.h>
+#include <WiFiClient.h>
+#include <WiFiServer.h>
+
+#include "secrets.h"
+
+// Default IP address = 192.168.4.1
+
+#define PORT 1234
+#define CHANNEL 11
+#define HIDDEN true
+#define MAX_CONNECTION 1
+
+WiFiServer server(PORT);
+
+void setup()
+{
+	Serial.begin(9600);
+	Serial.setDebugOutput(true);
+
+	pinMode(2, OUTPUT);
+
+	// Wait for a USB connection to be established
+	while (!Serial)
+		(void)0;
+	delay(3000);
+	Serial.println("Server booted!");
+
+	// Start button server
+	WiFi.softAP(SSID, PASSWORD, CHANNEL, HIDDEN, MAX_CONNECTION);
+	Serial.println("AP Started");
+	server.begin();
+}
+
+void loop()
+{
+	digitalWrite(2, HIGH);
+	delay(500);
+	digitalWrite(2, LOW);
+	delay(500);
+
+	Serial.println("ESP32 loopy!");
+
+	// -------------------------------------
+
+	WiFiClient client = server.available();
+	if (client) {
+		Serial.println("Client connected");
+
+		// unsigned long start = 0;
+		while (client.connected()) {
+			if (client.available()) {
+				String msg = client.readStringUntil('\n');
+				Serial.print("Received: ");
+				Serial.println(msg);
+
+				// Do something with the message, like toggling an LED
+
+				client.print("ACK\n");
+				Serial.println("Sent ACK");
+				// start = millis();
+			}
+
+			// // Kill lingering connections
+			// if (start != 0 && millis() - start < 1000) {
+			// 	Serial.println("Client kill..");
+			// 	break;
+			// }
+		}
+		client.stop();
+		Serial.println("Client disconnected");
+	}
+}

server/src/secrets.h.example

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+#pragma once
+
+#define SSID "EXAMPLE"
+#define PASSWORD "12345678"

server/test/README

@@ -0,0 +1,11 @@
+
+This directory is intended for PlatformIO Test Runner and project tests.
+
+Unit Testing is a software testing method by which individual units of
+source code, sets of one or more MCU program modules together with associated
+control data, usage procedures, and operating procedures, are tested to
+determine whether they are fit for use. Unit testing finds problems early
+in the development cycle.
+
+More information about PlatformIO Unit Testing:
+- https://docs.platformio.org/en/latest/advanced/unit-testing/index.html