initialer commit eines statusclients für eine NodeMCU

This commit is contained in:
example 2022-04-06 11:37:51 +02:00
parent 56742d8707
commit 7598b237bf
4 changed files with 273 additions and 0 deletions

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/*
* file: certs.template
* desc: This file is part of the Krautspace Doorstatus project. It contains
* certificates for the statusclient.ino programm, that runs on a NodeMCU
* with a ESP8266 chip.
*
* Replace the comments in certificate sections with our own certificates.
*/
const char SERVER_CERT[] PROGMEM = R"EOF(
-----BEGIN CERTIFICATE-----
/*
* lace for the public server certificate to authenticate the doorstatus
* server.
*/
-----END CERTIFICATE-----
)EOF";
const char CLIENT_CERT[] PROGMEM = R"EOF(
-----BEGIN CERTIFICATE-----
/*
* Place for the clients (this program) public certificate to authenticate
* client against the server.
*/
-----END CERTIFICATE-----
)EOF";
const char CLIENT_KEY[] PROGMEM = R"EOF(
-----BEGIN CERTIFICATE-----
/*
* Place for the clients private key file.
*/
-----END CERTIFICATE-----
)EOF";

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/*
* file: config.h
*/
/* endpoint */
#define SERVER_URL "status.kraut.space"
#define SERVER_PORT 10001
/* serial interface settings */
#define BAUD_RATE 115200
#define DEBUG true
/* frequence to read the pin */
#define FREQUENCY 10000
/* time server settings */
#define NTP_URL "pool.ntp.org"
#define TZ_STRING "CET-1CDT,M3.5.0,M10.5.0/3"

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/*
* file: credentials.template
* desc: This file is part of the Krautspace Doorstatus project. It contains
* wifi ssid and passwords for the statusclient.ino programm, that runs on a
* NodeMCU with a ESP8266 chip.
*
* Rename this file into 'credentials.h' and adapt the values to your
* wifi conditions.
*/
/* wifi credentials */
#define SSID_1 "your_first__wlan_ssid"
#define PSK_1 "your_first_wlan_passwort"
#define SSID_2 "your_second_wlan_ssid"
#define PSK_2 "your_seconde_wlan_password"
#define SSID_3 "your_third_wlan_ssid"
#define PSK_3 "your_third_wlan_password"

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/*
* file: statusclient.ino
* desc: This file is part of the Krautspace Doorstatus project. It's the
* main file for a client, who deals with the input from a reed sensor and
* push these values to a server. The code is make to run on a NodeMCU with
* ESP8266 chip.
*/
#include <ESP8266WiFiMulti.h>
#include <WiFiClientSecure.h>
#include <time.h>
#include "config.h"
#include "certs.h"
#include "credentials.h"
const int LED_PIN = 16; // D0
const int REED_PIN = 5; // D1
typedef enum {
DOOR_CLOSED = 0,
DOOR_OPEN = 1
} door_state;
door_state current_door_state = DOOR_CLOSED;
door_state new_door_state = DOOR_CLOSED;
void init_serial() {
/*
* set baudrate and debug modus
*/
Serial.begin(BAUD_RATE);
Serial.setDebugOutput(DEBUG);
Serial.println();
Serial.println("[Srl] Serial interface initialized");
}
void init_pins() {
/*
* set gpio for reed sensor and led
*/
pinMode(REED_PIN, INPUT_PULLUP);
pinMode(LED_PIN, OUTPUT);
digitalWrite(LED_PIN, LOW);
Serial.println("[Pin] LED and REED initialized");
}
void init_wifi() {
/*
* first turn wifi off and than in access point mode
* maybe turn of is not needed!
*/
ESP8266WiFiMulti wifi;
WiFi.mode(WIFI_OFF);
WiFi.mode(WIFI_STA);
wifi.addAP(SSID_1, PSK_1);
wifi.addAP(SSID_2, PSK_2);
Serial.println("[Wifi] Wifi initialized");
wifi.run();
if (WiFi.status() == WL_CONNECTED) {
Serial.print("[Wif] Connected to ");
Serial.println(WiFi.SSID());
Serial.print("[Wifi] IP: ");
Serial.println(WiFi.localIP());
} else {
Serial.println("[Wifi] Error: Failed to connect");
}
}
door_state read_door_state() {
/*
* die initialisierung des reed-pin mit pullup bewirkt, daß am pin
* 3,3 volt anliegen. die verbindung des pins mit GND sorgt dafür,
* daß die spannung "abfließen" kann. dadurch hat der pin dann den
* status 'low'.
* geschlossene tür -> reed geschlossen -> low
* geöffnete tür -> reed offen -> high
*/
if (digitalRead(REED_PIN) == HIGH) {
return DOOR_OPEN;
}
return DOOR_CLOSED;
}
void toggle_led(door_state state) {
/*
* turns onboard led on or depends on the door state
*/
if (state == DOOR_OPEN) {
digitalWrite(LED_PIN, LOW);
} else {
digitalWrite(LED_PIN, HIGH);
}
delay(500);
}
void set_clock() {
configTime(TZ_STRING, NTP_URL);
Serial.print("Waiting for NTP time sync: ");
time_t now = time(nullptr);
while (now < 8 * 3600 * 2) {
delay(500);
Serial.print(".");
now = time(nullptr);
}
Serial.println("");
struct tm timeinfo;
gmtime_r(&now, &timeinfo);
Serial.print("Current time: ");
Serial.print(asctime(&timeinfo));
}
int send_status(door_state state) {
/*
* geht die initialisierung mit einem byte länge?
* terminiert strcpy den status mit \0?
*/
char status[2] = "";
if (state == DOOR_CLOSED) {
strncpy(status, "0", 1);
} else if (state == DOOR_OPEN) {
strncpy(status, "1", 1);
} else {
return 1;
}
BearSSL::WiFiClientSecure client;
BearSSL::X509List server_cert(SERVER_CERT);
BearSSL::X509List client_cert(CLIENT_CERT);
BearSSL::PrivateKey client_key(CLIENT_KEY);
client.setTrustAnchors(&server_cert);
client.setClientRSACert(&client_cert, &client_key);
delay(500);
Serial.println("[Ctx] SSL Context initialized");
Serial.print("[Ctx] Free Heap: ");
Serial.println(ESP.getFreeHeap());
delay(500);
Serial.printf("[Send] Connect to %s:%i\n", SERVER_URL, SERVER_PORT);
client.connect(SERVER_URL, SERVER_PORT);
if (!client.connected()) {
Serial.println("[Send] Can't connect to server");
Serial.print("[Send] SSL Error: ");
Serial.println(client.getLastSSLError());
client.stop();
return 1;
} else {
ESP.resetFreeContStack();
uint32_t freeStackStart = ESP.getFreeContStack();
Serial.println("[Send] Connection successful established");
Serial.printf("[Send] Send status: %s\n", status);
client.write(status);
}
return 0;
}
void setup() {
/*
* things to do once at boot time
*/
init_serial();
Serial.print("[Init] Free Heap ( after serial init): ");
Serial.println(ESP.getFreeHeap());
init_pins();
Serial.print("[Init] Free Heap (after pins init): ");
Serial.println(ESP.getFreeHeap());
init_wifi();
Serial.print("[Init] Free Heap (after wifi init): ");
Serial.println(ESP.getFreeHeap());
delay(500);
set_clock();
Serial.print("[Init] Free Heap (after setting clock): ");
Serial.println(ESP.getFreeHeap());
delay(500);
}
void loop() {
/*
* things are running in a endless loop
*/
new_door_state = read_door_state();
if (new_door_state != current_door_state) {
Serial.printf("[Loop] Status has changed to %i\n", new_door_state);
toggle_led(new_door_state);
send_status(new_door_state);
current_door_state = new_door_state;
}
Serial.print("[Loop] Free Heap: ");
Serial.println(ESP.getFreeHeap());
delay(FREQUENCY);
}