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.gitignore

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README.md

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+# Simple MQTT MSP432P401R example
+
+Simple MQTT example made for university project with [Dino Dizdarević](https://github.com/dizda13). 
+
+Relies on a wifi connection which needs to be configured in code (ssid and password are hardcoded) and on [Energia IDE](http://energia.nu/). If everything is set up properly, device will try to connect to the MQTT server. If it fails, secondary LED will light up red.
+
+After connection to MQTT server is made, device will publish rssi to the server every 5 seconds and it will also publish button presses. It will subscribe to topics which allow turning on 3 leds (red, green and blue). It will also subscribe to topic which allows the error led to be cleared.
+
+This project is just a simple representation of a very simple control/monitoring via lightweight MQTT protocol.

simple-mqtt-msp432-example.ino

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+#define MQTTCLIENT_QOS2 1
+
+// LEDS
+#define RED RED_LED
+#define GRE GREEN_LED
+#define BLU BLUE_LED
+
+// msp432P401R specific pins for second led and right and left buttons
+#define ERRORLED 78
+#define LEFT 74
+#define RIGHT 73
+
+#include <SPI.h>
+#include <WiFi.h>
+#include <WifiIPStack.h>
+#include <Countdown.h>
+#include <MQTTClient.h>
+#include <pthread.h>
+
+// Network Config - REPLACE WITH SSID
+char ssid[] = "wifiSSid";
+// Network Password - REPLACE WITH REAL PASSWORD
+char password[] = "realpass";
+
+// MQTT Server info - REPLACE WITH REAL HOST NAME
+char hostname[] = "host name!";
+const int port = 1883;
+
+const int serialbaud = 115200;
+
+char printbuf[100];
+
+int arrivedcount = 0;
+int connectionErrors = 0;
+
+// Simple logging of recevied messages on serial port
+void logMessage(MQTT::Message& message) 
+{
+    sprintf(printbuf, "Message %d arrived: qos %d, retained %d, dup %d, packetid %d\n",
+          ++arrivedcount, message.qos, message.retained, message.dup, message.id);
+    Serial.print(printbuf);
+    sprintf(printbuf, "Payload %s\n", (char*)message.payload);
+    Serial.print(printbuf);
+}
+
+// Callback when a request to change led color has arrived from broker
+void colorArrived(MQTT::MessageData& md)
+{
+  MQTT::Message &message = md.message;
+  logMessage(message);
+
+	// Consider only messages with 3 characters - one for each of RGB
+  if (message.payloadlen == 3) {
+      bool red = ((char*)message.payload)[0] - '0';
+      bool green = ((char*)message.payload)[1] - '0';
+      bool blue = ((char*)message.payload)[2] - '0';
+
+      digitalWrite(RED, red ? HIGH : LOW);
+      digitalWrite(GRE, green ? HIGH : LOW);
+      digitalWrite(BLU, blue ? HIGH : LOW);
+  } else {
+      sprintf(printbuf, "Bad payload: %s\n", (char*)message.payload);
+      Serial.print(printbuf);
+  }
+}
+
+// Callback when a request to disable error notification led has arrived from broker
+void errorOverrideArrived(MQTT::MessageData& md) {
+    MQTT::Message &message = md.message;
+    logMessage(message);
+    fixError();
+}
+
+WifiIPStack ipstack;
+MQTT::Client<WifiIPStack, Countdown> client = MQTT::Client<WifiIPStack, Countdown>(ipstack);
+
+// Topics used - publishing to sensors and subscribing to controls
+char* ledControlTopic = "devices/red/controls/led";
+char* errorControlTopic = "devices/red/controls/error";
+char* leftSensorTopic = "devices/red/sensors/left";
+char* rightSensorTopic = "devices/red/sensors/right";
+char* wifiSensorTopic = "devices/red/sensors/wifi";
+
+// Counter for conection errors to turn on error notification led
+void onConnectionError() {
+    connectionErrors++;
+    if (connectionErrors >= 3) {
+        // Light up red LED
+        digitalWrite(ERRORLED, HIGH);
+    } else {
+        // Keep LED off
+        digitalWrite(ERRORLED, LOW);
+    }
+}
+
+// Clear error notification led
+void fixError() {
+    connectionErrors = 0;
+    // Keep LED off
+    digitalWrite(ERRORLED, LOW);
+}
+
+// Connection to MQTT broker
+void connect()
+{
+  sprintf(printbuf, "Connecting to %s:%d\n", hostname, port);
+  Serial.print(printbuf);
+  int rc = ipstack.connect(hostname, port);
+  if (rc != 1)
+  {
+    sprintf(printbuf, "rc from TCP connect is %d\n", rc);
+    Serial.print(printbuf);
+    onConnectionError();
+  }
+ 
+  Serial.println("MQTT connecting");
+  MQTTPacket_connectData data = MQTTPacket_connectData_initializer;       
+  data.MQTTVersion = 3;
+  data.clientID.cstring = (char*)"red";
+  rc = client.connect(data);
+  if (rc != 0)
+  {
+    sprintf(printbuf, "rc from MQTT connect is %d\n", rc);
+    Serial.print(printbuf);
+    onConnectionError();
+  }
+  Serial.println("MQTT connected");
+
+	// Subscribe to controls
+  rc = client.subscribe(ledControlTopic, MQTT::QOS2, colorArrived);
+  if (rc != 0)
+  {
+    sprintf(printbuf, "rc from MQTT subscribe is %d\n", rc);
+    Serial.print(printbuf);
+    onConnectionError();
+  }
+
+  rc = client.subscribe(errorControlTopic, MQTT::QOS2, errorOverrideArrived);
+  if (rc != 0)
+  {
+    sprintf(printbuf, "rc from MQTT subscribe is %d\n", rc);
+    Serial.print(printbuf);
+    onConnectionError();
+  }
+
+  Serial.println("MQTT subscribed");
+}
+
+// create the light listener - just waiting for controls
+void *listen(void* ptr)
+{
+    while(1) {
+        client.yield(1000);
+        delay(50);
+    }
+}
+
+// create the wifi publisher - publishing current wifi rssi every 5 seconds to /wifi topic
+void *publish_wifi(void* ptr)
+{
+    while(1) {
+        char buf[100];
+
+        MQTT::Message message;
+        message.qos = MQTT::QOS0;
+        message.retained = false;
+        message.dup = false;
+        sprintf(buf, "%d", WiFi.RSSI());
+        Serial.println(buf);
+        message.payload = (void*)buf;
+        message.payloadlen = strlen(buf)+1;
+        int rc = client.publish(wifiSensorTopic, message);
+        delay(5000);
+    }
+}
+
+// listen for button presses - debounces for 500ms after releasing - publishes to /left or /right depending on which button was pressed
+void *listen_button(void* btn)
+{
+    bool pressed = false;
+    while(1) {
+        char buf[100];
+        int btnNum = (int)btn;
+        int state = digitalRead(btnNum);
+        MQTT::Message message;
+        message.qos = MQTT::QOS0;
+          message.retained = false;
+          message.dup = false;
+        if (pressed) {
+            if (state == HIGH) {
+                pressed = false;
+                delay(500);
+            }
+        } else {
+          if (state == LOW) {
+              pressed = true;
+              sprintf(buf, "PRESSED");
+              Serial.println(buf);
+              message.payload = (void*)buf;
+              message.payloadlen = strlen(buf)+1;
+              int rc = client.publish(btnNum == LEFT ? leftSensorTopic : rightSensorTopic, message);
+             client.yield(100);
+          }
+         }
+				 // Small delay to allow other threads to jump in
+        delay(10);
+    }
+}
+
+void setup()
+{
+  // initialize leds as output
+  pinMode(RED, OUTPUT);
+  pinMode(BLU, OUTPUT);
+  pinMode(GRE, OUTPUT);
+  pinMode(ERRORLED, OUTPUT);
+
+  // initialize buttons
+  pinMode(LEFT, INPUT_PULLUP);
+  pinMode(RIGHT, INPUT_PULLUP);
+
+	// Initialize serial
+  Serial.begin(serialbaud);
+  Serial.print("Attempting to connect to Network named: ");
+  Serial.println(ssid); 
+  // Connect to network
+  WiFi.begin(ssid, password);
+  while ( WiFi.status() != WL_CONNECTED) {
+    // print dots while we wait to connect
+    Serial.print(".");
+    delay(300);
+  }
+  
+  Serial.println("\nYou're connected to the network");
+  Serial.println("Waiting for an ip address");
+  
+  while (WiFi.localIP() == INADDR_NONE) {
+    // print dots while we wait for an ip addresss
+    Serial.print(".");
+    delay(300);
+  }
+
+  Serial.println("\nIP Address obtained");
+  // We are connected and have an IP address.
+  Serial.println(WiFi.localIP());
+  
+  connect();
+
+  // create the threads
+  pthread_t thread1, thread2, thread3, thread4;
+  int thr = 1;
+  // start the listener thread
+  pthread_create(&thread1, NULL, *listen, (void*) thr);
+
+	// start wifi RSSI publisher thread
+  pthread_create(&thread2, NULL, *publish_wifi, (void*) thr);
+
+	// Start the left and right button listeners
+  pthread_create(&thread3, NULL, *listen_button, (void*) LEFT);
+  pthread_create(&thread4, NULL, *listen_button, (void*) RIGHT);
+}
+
+void loop()
+{
+	// Reconnect if needed
+  if (!client.isConnected())
+    connect();
+  
+	// Don't spam
+  delay(5000);
+}

targetConfigs/MSP432P401R.ccxml

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+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<configurations XML_version="1.2" id="configurations_0">
+    <configuration XML_version="1.2" id="configuration_0">
+        <instance XML_version="1.2" desc="Texas Instruments XDS110 USB Debug Probe" href="connections/TIXDS110_Connection.xml" id="Texas Instruments XDS110 USB Debug Probe" xml="TIXDS110_Connection.xml" xmlpath="connections"/>
+        <connection XML_version="1.2" id="Texas Instruments XDS110 USB Debug Probe">
+            <instance XML_version="1.2" href="drivers/tixds510cs_dap.xml" id="drivers" xml="tixds510cs_dap.xml" xmlpath="drivers"/>
+            <instance XML_version="1.2" href="drivers/tixds510cortexM.xml" id="drivers" xml="tixds510cortexM.xml" xmlpath="drivers"/>
+            <property Type="choicelist" Value="2" id="SWD Mode Settings">
+                <choice Name="SWD Mode - Aux COM port is target TDO pin" value="nothing"/>
+            </property>
+            <platform XML_version="1.2" id="platform_0">
+                <instance XML_version="1.2" desc="MSP432P401R" href="devices/msp432p401r.xml" id="MSP432P401R" xml="msp432p401r.xml" xmlpath="devices"/>
+            </platform>
+        </connection>
+    </configuration>
+</configurations>

targetConfigs/readme.txt

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+The 'targetConfigs' folder contains target-configuration (.ccxml) files, automatically generated based
+on the device and connection settings specified in your project on the Properties > General page.
+
+Please note that in automatic target-configuration management, changes to the project's device and/or
+connection settings will either modify an existing or generate a new target-configuration file. Thus,
+if you manually edit these auto-generated files, you may need to re-apply your changes. Alternatively,
+you may create your own target-configuration file for this project and manage it manually. You can
+always switch back to automatic target-configuration management by checking the "Manage the project's
+target-configuration automatically" checkbox on the project's Properties > General page.