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may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<https://www.gnu.org/licenses/why-not-lgpl.html>.

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# Wake-on-ESP – PCs per WLAN einschalten
Dies ist der Quellcode zum Artikel ["Funkwecker" aus c't 11/2019](#). Der Code basiert auf PlatformIO und ist für den ESP8266 gedacht.
Einen Schaltplan als Fritzing-Datei finden Sie im Unterverzeichnis schematics.
# Wake-on-ESP – Powering up computers via WiFi
This is the source code to the german language article ["Funkwecker" presented in c't 11/2019](#). The code is based on PlatformIO and was written for the ESP8266.
A Fritzing schematic is found in the correspondingly named folder.

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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 usual convention is to give header files names that end with `.h'.
It is most portable to use only letters, digits, dashes, and underscores in
header file names, and at most one dot.
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

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

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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:d1_mini_lite]
platform = espressif8266
board = d1_mini_lite
framework = arduino
lib_deps = ESPAsyncUDP, AsyncMqttClient, WifiManager, ArduinoJson
monitor_speed = 115200
; set frequency to 160MHz
board_build.f_cpu = 160000000L
build_flags = -DASYNC_TCP_SSL_ENABLED=1

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#include <FS.h>
#include <ArduinoJson.h>
static char mqtt_server[128] = "";
static char mqtt_port[6] = "";
static char mqtt_user[128] = "";
static char mqtt_password[128] = "";
static char mqtt_topic[128] = "";
static char mqtt_fingerprint[256] = "";
static bool shouldSaveConfig = false;
void saveConfigCallback();
void loadConfig();
void saveConfig();
void saveConfigCallback () {
Serial.println("Should save config");
shouldSaveConfig = true;
}
void loadConfig() {
Serial.println("mounting FS...");
if (SPIFFS.begin()) {
Serial.println("mounted file system");
if (SPIFFS.exists("/config.json")) {
//file exists, reading and loading
Serial.println("reading config file");
File configFile = SPIFFS.open("/config.json", "r");
if (configFile) {
Serial.println("Opened config file");
size_t size = configFile.size();
// Allocate a buffer to store contents of the file.
std::unique_ptr<char[]> buf(new char[size]);
configFile.readBytes(buf.get(), size);
StaticJsonDocument<1024> doc;
DeserializationError error = deserializeJson(doc, buf.get());
if (error)
Serial.println("Failed to read file, using default configuration");
JsonObject json = doc.as<JsonObject>();
if (!json.isNull()) {
Serial.println("Parsed json");
strcpy(mqtt_server, json["mqtt_server"]);
strcpy(mqtt_port, json["mqtt_port"]);
strcpy(mqtt_user, json["mqtt_user"]);
strcpy(mqtt_password, json["mqtt_password"]);
strcpy(mqtt_topic, json["mqtt_topic"]);
strcpy(mqtt_fingerprint, json["mqtt_fingerprint"]);
} else {
Serial.println("failed to load json config");
}
configFile.close();
}
}
} else {
Serial.println("Failed to mount FS. Formatting in 10 Seconds.");
delay(10000);
SPIFFS.format();
}
}
void saveConfig() {
Serial.println("saving config");
StaticJsonDocument<1024> doc;
doc["mqtt_server"] = mqtt_server;
doc["mqtt_port"] = mqtt_port;
doc["mqtt_user"] = mqtt_user;
doc["mqtt_password"] = mqtt_password;
doc["mqtt_topic"] = mqtt_topic;
doc["mqtt_fingerprint"] = mqtt_fingerprint;
File configFile = SPIFFS.open("/config.json", "w");
if (!configFile) {
Serial.println("failed to open config file for writing");
}
if (serializeJson(doc, configFile) == 0) {
Serial.println(F("Failed to write to file"));
}
configFile.close();
shouldSaveConfig = false;
}

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#include <Arduino.h>
byte valFromChar(char c) {
if(c >= 'a' && c <= 'f') return (byte( (c - 'a') + 10) & 0x0F);
if(c >= 'A' && c <= 'F') return (byte( (c - 'A') + 10) & 0x0F);
if(c >= '0' && c <= '9') return (byte( (c - '0')) & 0x0F);
return 0;
}
/*
* Very simple converter from a String representation of a MAC address to
* 6 bytes. Does not handle errors or delimiters, but requires very little
* code space and no libraries.
*/
void StringToBytes(const String input, byte *bytes) {
if(input.length() >= 12) {
for(unsigned int i = 0; i < 6; i++) {
bytes[i] = byte((valFromChar(input.charAt(i*2)) << 4) | valFromChar(input.charAt(i*2 + 1)));
}
} else {
Serial.println("Incorrect MAC format.");
}
}

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#include <FS.h>
#include <Arduino.h>
#include <ESP8266WiFi.h>
#include <DNSServer.h>
#include <ESP8266WebServer.h>
#include "config.h"
#include "hextools.h"
#include "wifi.h"
#include "pin.h"
#include "mqtt.h"
#include "wol.h"
void setup() {
Serial.begin(115200);
Serial.println("===Wake-on-ESP===");
loadConfig();
wifiSetup();
if (shouldSaveConfig) {
saveConfig();
}
pinSetup();
wolSetup();
mqttSetup();
}
void loop() {
if(action_power == 1){
pinToggle(POWER_PIN, 200);
action_power = 0;
}
if(action_power_force == 1){
pinToggle(POWER_PIN, 5000);
action_power_force = 0;
}
if(action_reset == 1){
pinToggle(RESET_PIN, 200);
action_reset = 0;
}
// is configuration portal requested?
if ( digitalRead(CONFIG_PIN) == LOW ) {
wifiSetup(true);
}
if (shouldSaveConfig) {
saveConfig();
}
}

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#include <ESP8266WiFi.h>
#include <AsyncMqttClient.h>
#include <Ticker.h>
static bool action_power = 0;
static bool action_power_force = 0;
static bool action_reset = 0;
static AsyncMqttClient mqttClient;
Ticker mqttReconnectTimer;
void mqttSetup();
void connectToMqtt() {
Serial.println("*MQTT: Connecting to MQTT...");
mqttClient.connect();
}
void onMqttConnect(bool sessionPresent) {
Serial.println("*MQTT: Connected to MQTT.");
Serial.print("*MQTT: Session present: ");
Serial.println(sessionPresent);
if (strlen(mqtt_topic)==0) {
strcpy(mqtt_topic,"wakeonesp/wake");
};
uint16_t packetIdSub = mqttClient.subscribe(mqtt_topic, 2);
Serial.print("*MQTT: Subscribing at QoS 2, packetId: ");
Serial.println(packetIdSub);
}
void onMqttDisconnect(AsyncMqttClientDisconnectReason reason) {
Serial.println("*MQTT: Disconnected from MQTT.");
// if (reason == AsyncMqttClientDisconnectReason::TLS_BAD_FINGERPRINT) {
// Serial.println("Bad server fingerprint.");
// }
if (WiFi.isConnected()) {
mqttReconnectTimer.once(5, connectToMqtt);
}
}
void onMqttSubscribe(uint16_t packetId, uint8_t qos) {
Serial.println("*MQTT: Subscribe acknowledged.");
Serial.print("*MQTT: packetId: ");
Serial.println(packetId);
Serial.print("*MQTT: qos: ");
Serial.println(qos);
}
void onMqttUnsubscribe(uint16_t packetId) {
Serial.println("*MQTT: Unsubscribe acknowledged.");
Serial.print("*MQTT: packetId: ");
Serial.println(packetId);
}
void onMqttMessage(char* topic, char* payload, AsyncMqttClientMessageProperties properties, size_t len, size_t index, size_t total) {
Serial.println("*MQTT: Publish received.");
Serial.print("*MQTT: topic: ");
Serial.println(topic);
Serial.print("*MQTT: qos: ");
Serial.println(properties.qos);
Serial.print("*MQTT: dup: ");
Serial.println(properties.dup);
Serial.print("*MQTT: retain: ");
Serial.println(properties.retain);
Serial.print("*MQTT: len: ");
Serial.println(len);
Serial.print("*MQTT: index: ");
Serial.println(index);
Serial.print("*MQTT: total: ");
Serial.println(total);
Serial.println();
if (!strncmp(payload, "on", len)) {
action_power = 1;
} else if (!strncmp(payload, "force_off", len)) {
action_power_force = 1;
} else if (!strncmp(payload, "reset", len)) {
action_reset = 1;
}
}
void onMqttPublish(uint16_t packetId) {
Serial.println("*MQTT: Publish acknowledged.");
Serial.print("*MQTT: packetId: ");
Serial.println(packetId);
}
void mqttSetup() {
mqttClient.onConnect(onMqttConnect);
mqttClient.onDisconnect(onMqttDisconnect);
mqttClient.onSubscribe(onMqttSubscribe);
mqttClient.onUnsubscribe(onMqttUnsubscribe);
mqttClient.onMessage(onMqttMessage);
mqttClient.onPublish(onMqttPublish);
IPAddress mqtt_ip;
mqtt_ip.fromString(mqtt_server);
Serial.print("*MQTT: Connecting to: ");
Serial.println(mqtt_ip);
mqttClient.setServer(mqtt_ip, atoi(mqtt_port));
mqttClient.setCredentials(mqtt_user, mqtt_password);
String clientIdStr = "WoE-"+WiFi.macAddress();
char clientId[24];
clientIdStr.toCharArray(clientId,24);
mqttClient.setClientId(clientId);
// if (strncmp(mqtt_port, "8883", 4)) {
// mqttClient.setSecure(true);
// byte target_fp[128];
// StringToBytes((String)mqtt_fingerprint, target_fp);
// mqttClient.addServerFingerprint(target_fp);
// }
mqttClient.connect();
}

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#include <Arduino.h>
#define RESET_PIN 15 //D7
#define POWER_PIN 13 //D8
#define CONFIG_PIN 2 //D4
void pinSetup();
void pinToggle(uint8_t pin, unsigned long ms);
void pinSetup() {
pinMode(CONFIG_PIN, INPUT);
pinMode(RESET_PIN,OUTPUT);
digitalWrite(RESET_PIN, LOW);
pinMode(POWER_PIN,OUTPUT);
digitalWrite(POWER_PIN, LOW);
}
void pinToggle(uint8_t pin, unsigned long ms) {
Serial.printf("*PIN: Closing pin %i for %i ms\n", pin, int(ms));
digitalWrite(pin, HIGH);
delay(ms);
digitalWrite(pin, LOW);
Serial.println("*PIN: Circuit open.");
}

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#include <WiFiManager.h>
// #include "config.h"
void wifiSetup(bool onDemand);
void wifiSetup(bool onDemand = false) {
String mac = "<p>This devices MAC-Address is: ";
mac += WiFi.macAddress();
mac += "</p>";
String fp_info = "<p>Run <pre>echo | openssl s_client -connect MYMQTTSERVER:8883 | openssl x509 -fingerprint -noout</pre> to get your TLS fingerprint.</p>";
WiFiManagerParameter custom_text(mac.c_str());
WiFiManagerParameter custom_text_ssl(fp_info.c_str());
WiFiManagerParameter custom_mqtt_server("server", "MQTT Server IP", mqtt_server, 128);
WiFiManagerParameter custom_mqtt_port("port", "MQTT Port", mqtt_port, 6);
WiFiManagerParameter custom_mqtt_user("user", "MQTT Username", mqtt_user, 128);
WiFiManagerParameter custom_mqtt_password("password", "MQTT Password", mqtt_password, 128);
WiFiManagerParameter custom_mqtt_topic("topic", "MQTT Topic", mqtt_topic, 128);
WiFiManagerParameter custom_mqtt_fingerprint("fingerprint", "MQTT Fingerprint", mqtt_fingerprint, 128);
WiFiManager wifiManager;
wifiManager.setAPStaticIPConfig(IPAddress(192,168,4,1), IPAddress(192,168,4,1), IPAddress(255,255,255,0));
wifiManager.setTimeout(240);
wifiManager.setSaveConfigCallback(saveConfigCallback);
wifiManager.addParameter(&custom_text);
// wifiManager.addParameter(&custom_text_ssl);
wifiManager.addParameter(&custom_mqtt_server);
wifiManager.addParameter(&custom_mqtt_port);
wifiManager.addParameter(&custom_mqtt_user);
wifiManager.addParameter(&custom_mqtt_password);
wifiManager.addParameter(&custom_mqtt_topic);
// wifiManager.addParameter(&custom_mqtt_fingerprint);
if (onDemand) {
wifiManager.startConfigPortal("Wake-on-ESP");
} else {
wifiManager.autoConnect("Wake-on-ESP");
}
strcpy(mqtt_server, custom_mqtt_server.getValue());
strcpy(mqtt_port, custom_mqtt_port.getValue());
strcpy(mqtt_user, custom_mqtt_user.getValue());
strcpy(mqtt_password, custom_mqtt_password.getValue());
strcpy(mqtt_password, custom_mqtt_topic.getValue());
strcpy(mqtt_fingerprint, custom_mqtt_fingerprint.getValue());
}

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#include <ESP8266WiFi.h>
#include <ESPAsyncUDP.h>
static AsyncUDP udp;
static uint16_t localUdpPort = 9; // local port to listen on
static unsigned char incomingPacket[255]; // buffer for incoming packets
const byte preamble[] = {255,255,255,255,255,255};
static byte target_mac[6];
void udpCallback(AsyncUDPPacket packet);
void wolSetup();
void udpCallback(AsyncUDPPacket packet) {
size_t len = packet.length();
memcpy(&incomingPacket, packet.data(),len);
if (len == 102) {
Serial.printf("*WOL: Received a package from %s\n", packet.remoteIP().toString().c_str());
if (len > 0) {
incomingPacket[len] = 0;
}
bool packageIsValid = true;
for(byte b=0; b<6; b++) {
if(preamble[b] != incomingPacket[b])
{
packageIsValid = false;
break;
}
}
if(packageIsValid) {
Serial.println("*WOL: Package seems to be a valid WOL-package");
}
for(byte b=6; b<12; b++) {
if(int(target_mac[b-6]) != int(incomingPacket[b]))
{
packageIsValid = false;
break;
}
}
if(packageIsValid) {
Serial.println("*WOL: Package is destined for me.");
action_power= 1;
}
}
}
void wolSetup() {
Serial.print("*WOL: My MAC-Address is: ");
String mac = WiFi.macAddress();
Serial.println(mac);
mac.replace(":","");
StringToBytes(mac, target_mac);
udp.listen(localUdpPort);
udp.onPacket(udpCallback);
Serial.printf("*WOL: Now listening at IP %s, UDP port %d\n", WiFi.localIP().toString().c_str(), localUdpPort);
}

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This directory is intended for PIO Unit Testing 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 PIO Unit Testing:
- https://docs.platformio.org/page/plus/unit-testing.html