From 9a7fd378324a514b1baff96f0ee86b21e6406fe7 Mon Sep 17 00:00:00 2001
From: Blaster4385 <venkatesh@tablaster.dev>
Date: Sat, 26 Apr 2025 16:42:46 +0530
Subject: feat: Transmit sensor data over mqtt

- This can be read by home assistant.
---
 sysmon.ino | 64 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 60 insertions(+), 4 deletions(-)

diff --git a/sysmon.ino b/sysmon.ino
index 1a6080d..fcfcc77 100644
--- a/sysmon.ino
+++ b/sysmon.ino
@@ -1,3 +1,5 @@
+#include <PubSubClient.h>
+#include <ESP8266WiFi.h>
 #include "Adafruit_GFX.h"
 #include "Adafruit_ILI9341.h"
 #include <XPT2046_Touchscreen.h>
@@ -6,12 +8,24 @@
 #include "datetimeHandler.h"
 #include "gfx_1.h"
 
+#define wifi_ssid "<SSID>"
+#define wifi_password "<PASSWORD>"
+
+#define mqtt_server "<HOST>"
+#define mqtt_user "<USER>"
+#define mqtt_password "<PASSWORD>"
+
+#define humidity_topic "homeassistant/sensor/humidity"
+#define temperature_topic "homeassistant/sensor/temperature"
+
 #define TFT_DC D4
 #define TFT_CS D2
 #define TFT_RESET D3
 #define DHTPIN D8
 #define DHTTYPE DHT22
 
+WiFiClient espClient;
+PubSubClient client(espClient);
 Adafruit_ILI9341 tft = Adafruit_ILI9341(TFT_CS, TFT_DC);
 DHT dht(DHTPIN, DHTTYPE);
 
@@ -21,6 +35,9 @@ static uint32_t displayTime = 0;
 
 void setup() {
   Serial.begin(115200);
+  delay(1000);
+  setup_wifi();
+  client.setServer(mqtt_server, 1883);
   initHardware();
   gfx1_layout();
 }
@@ -28,7 +45,9 @@ void setup() {
 void update(String command) {
   if (!isnan(dht.readTemperature())) {
     localHum = dht.readHumidity();
+    client.publish(humidity_topic, String(localHum).c_str(), true);
     localTemp = dht.readTemperature() - 4;
+    client.publish(temperature_topic, String(localTemp).c_str(), true);
   }
 
   String keys[] = { "CpuTemp", "CpuUsage", "RamMax", "RamFree", "Time", "OS", "Kernel", "Uptime" };
@@ -45,9 +64,6 @@ void update(String command) {
   }
 
   for (int i = 0; i < std::size(values); i++) {
-    Serial.print(keys[i]);
-    Serial.print(" = ");
-    Serial.println(values[i]);
     switch (i) {
       case 0:
         if (values[i] != "")
@@ -87,11 +103,51 @@ void update(String command) {
 }
 
 void loop() {
+  if (!client.connected()) {
+    reconnect();
+  }
+  client.loop();
   String command = Serial.readString();
   command.trim();
   update(command);
 }
 
+void setup_wifi() {
+  // We start by connecting to a WiFi network
+  Serial.print("Hello WiFi");
+  Serial.println();
+  Serial.print("Connecting to ");
+  Serial.println(wifi_ssid);
+
+  WiFi.begin(wifi_ssid, wifi_password);
+
+  while (WiFi.status() != WL_CONNECTED) {
+    delay(500);
+    Serial.print(".");
+  }
+
+  Serial.println("");
+  Serial.println("WiFi connected");
+  Serial.println("IP address: ");
+  Serial.println(WiFi.localIP());
+}
+
+void reconnect() {
+  // Loop until we're reconnected
+  while (!client.connected()) {
+    Serial.print("Attempting MQTT connection...");
+    if (client.connect("ESP8266Client", mqtt_user, mqtt_password)) {
+      Serial.println("connected");
+    } else {
+      Serial.print("failed, rc=");
+      Serial.print(client.state());
+      Serial.println(" try again in 5 seconds");
+      // Wait 5 seconds before retrying
+      delay(5000);
+    }
+  }
+}
+
 void initHardware() {
   pinMode(TFT_RESET, OUTPUT);
   digitalWrite(TFT_RESET, LOW);
@@ -101,4 +157,4 @@ void initHardware() {
   tft.begin();
   tft.setRotation(3);
   dht.begin();
-}
\ No newline at end of file
+}
-- 
cgit