initial commit

.gitignore

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+.pio
+.vscode/.browse.c_cpp.db*
+.vscode/c_cpp_properties.json
+.vscode/launch.json
+.vscode/ipch

.vscode/extensions.json

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+{
+    // See http://go.microsoft.com/fwlink/?LinkId=827846
+    // for the documentation about the extensions.json format
+    "recommendations": [
+        "platformio.platformio-ide"
+    ],
+    "unwantedRecommendations": [
+        "ms-vscode.cpptools-extension-pack"
+    ]
+}

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 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

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 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

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:d1_mini]
+platform = espressif8266
+board = d1_mini
+framework = arduino
+lib_deps = mobizt/ESP Mail Client @ ^1.1.7
+           arduino-libraries/NTPClient @ ^3.2.1
+           https://github.com/enjoyneering/AHTxx @ ^1.1.5
+monitor_speed = 115200

src/main.cpp

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+#include <Arduino.h>
+#include <ESP8266WiFi.h>
+#include <ESP_Mail_Client.h>
+#include <Wire.h>
+#include <AHTxx.h>
+
+#define ALARM_TEMP 85.0
+#define LOCATION "server room"
+
+#define HOSTNAME "tempmon"
+#define SSID "ncc74656"
+#define PSK  "Rw7qfY5tmtaWbXaWQ5aMSRkF"
+
+#define SMTP_HOST "alfter.us"
+#define SMTP_PORT 587
+#define SMTP_SENDER "salfter"
+#define SMTP_PASSWD "4zD7tistzCEElgwj"
+#define SENDER_NAME "Temperature Monitor"
+#define SENDER_EMAIL "tempmon@alfter.us"
+const String mail_recips[][2]={
+  {"Scott Alfter", "scott@alfter.us"},
+  {"Pushover client", "vsr61ekz1e@pomail.net"}
+};
+#define mail_recips_len 2
+
+#define I2C_SDA D3
+#define I2C_SCL D4
+
+SMTPSession smtp;
+
+float ahtValue;
+AHTxx aht10(AHTXX_ADDRESS_X38, AHT1x_SENSOR);
+
+void setup() 
+{
+  Serial.begin(115200);
+
+  // set up sensor
+  while (aht10.begin(I2C_SDA, I2C_SCL)!=true)
+  {
+    Serial.println("waiting for sensor");
+    delay(2000);
+  }
+
+  // connect to network
+  WiFi.hostname(HOSTNAME);
+  WiFi.begin(SSID, PSK);
+  while (WiFi.status()!=WL_CONNECTED)
+    delay(500);
+  Serial.println("connected to WiFi");
+}
+
+bool active=false;
+void loop() 
+{
+  ahtValue=aht10.readTemperature();
+  if (ahtValue!=AHTXX_ERROR)
+  {
+    Serial.print("temp=");
+    Serial.print(ahtValue/5.0*9.0+32.0);
+    Serial.println("F");
+    if (ahtValue/5.0*9.0+32.0>=ALARM_TEMP && !active)
+    {
+      active=true; // don't spam
+
+      // send mail
+      ESP_Mail_Session session;
+      session.server.host_name=SMTP_HOST;
+      session.server.port=SMTP_PORT;
+      session.login.email=SMTP_SENDER;
+      session.login.password=SMTP_PASSWD;
+      session.login.user_domain="";
+      session.time.ntp_server="us.pool.ntp.org";
+      session.time.gmt_offset=0;
+      session.time.day_light_offset=0;
+
+      SMTP_Message msg;
+      msg.sender.name=SENDER_NAME;
+      msg.sender.email=SENDER_EMAIL;
+      msg.subject=(String)LOCATION+(String)" temperature too high: "+(String)(ahtValue/5.0*9.0+32.0);
+      for (int i=0; i<mail_recips_len; i++)
+        msg.addRecipient(mail_recips[i][0], mail_recips[i][1]);
+      msg.text.content=msg.subject;
+      msg.text.charSet="us-ascii";
+      msg.text.transfer_encoding=Content_Transfer_Encoding::enc_7bit;
+
+      if (!smtp.connect(&session))
+      {
+        active=false; // clear on error
+        return;
+      }
+      MailClient.sendMail(&smtp, &msg);
+    }
+    else
+      active=false;
+  }
+  else
+    aht10.softReset();
+  delay(1*60*1000);
+}

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