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Add AssistNow MQTT example
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‎examples/AssistNow/AssistNow_Online/Example5_AssistNowOnline_MQTT/Example5_AssistNowOnline_MQTT.ino

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/*
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Use ESP32 WiFi to get AssistNow Online (MGA) data from PointPerfect (broker) as a Client using MQTT
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By: Paul Clark / SparkFun
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Date: March 9th, 2022
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Based on original code by: u-blox AG / Michael Ammann
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License: MIT. See license file for more information but you can
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basically do whatever you want with this code.
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This example shows how to obtain AssistNow Online (MGA) data from a PointPerfect Broker over WiFi
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and push it over I2C to a ZED-F9x.
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It's confusing, but the Arduino is acting as a 'client' to the PointPerfect service.
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You will need to have a valid u-blox Thingstream account and have a PointPerfect Thing and payed plan.
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To sign up, go to: https://portal.thingstream.io/app/location-services/things
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This is a proof of concept to show how to connect via MQTT to get AssistNow MGA data.
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For more information about MQTT, SPARTN and PointPerfect Correction Services
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please see: https://www.u-blox.com/en/product/pointperfect
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Feel like supporting open source hardware?
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Buy a board from SparkFun!
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SparkFun Thing Plus - ESP32 WROOM: https://www.sparkfun.com/products/15663
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ZED-F9P RTK2: https://www.sparkfun.com/products/16481
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SparkFun GPS Breakout - ZOE-M8Q (Qwiic): https://www.sparkfun.com/products/15193
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Hardware Connections:
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Plug a Qwiic cable into the GNSS and a ESP32 Thing Plus
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If you don't have a platform with a Qwiic connection use the SparkFun Qwiic Breadboard Jumper (https://www.sparkfun.com/products/14425)
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Open the serial monitor at 115200 baud to see the output
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*/
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#include <WiFi.h>
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#include <WiFiClientSecure.h>
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#include <ArduinoMqttClient.h> // Click here to get the library: http://librarymanager/All#ArduinoMqttClient
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#include "secrets.h"
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#include <SparkFun_u-blox_GNSS_Arduino_Library.h> // Click here to get the library: http://librarymanager/All#SparkFun_u-blox_GNSS
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SFE_UBLOX_GNSS myGNSS;
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//Global variables
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//=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
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long lastReceived_ms = 0; //5 RTCM messages take approximately ~300ms to arrive at 115200bps
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int maxTimeBeforeHangup_ms = 10000; //If we fail to get a complete RTCM frame after 10s, then disconnect from caster
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//=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
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void setup()
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{
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Serial.begin(115200);
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while (!Serial);
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Serial.println(F("PointPerfect AssistNow testing"));
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Wire.begin(); //Start I2C
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if (myGNSS.begin() == false) //Connect to the Ublox module using Wire port
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{
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Serial.println(F("u-blox GPS not detected at default I2C address. Please check wiring. Freezing."));
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while (1);
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}
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Serial.println(F("u-blox module connected"));
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myGNSS.setI2COutput(COM_TYPE_UBX); //Turn off NMEA noise
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myGNSS.setPortInput(COM_PORT_I2C, COM_TYPE_UBX | COM_TYPE_NMEA | COM_TYPE_SPARTN);
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myGNSS.setNavigationFrequency(1); //Set output in Hz.
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Serial.print(F("Connecting to local WiFi"));
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WiFi.begin(ssid, password);
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while (WiFi.status() != WL_CONNECTED) {
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delay(500);
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Serial.print(F("."));
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}
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Serial.println();
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Serial.print(F("WiFi connected with IP: "));
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Serial.println(WiFi.localIP());
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while (Serial.available()) Serial.read();
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}
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void loop()
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{
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if (Serial.available())
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{
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beginClient();
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while (Serial.available()) Serial.read(); //Empty buffer of any newline chars
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}
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Serial.println(F("Press any key to start MQTT Client."));
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delay(1000);
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}
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WiFiClientSecure wifiClient = WiFiClientSecure();
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MqttClient mqttClient(wifiClient);
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void mqttMessageHandler(int messageSize) {
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uint8_t mgaData[512 * 4]; //Most incoming data is around 500 bytes but may be larger
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int mgaCount = 0;
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Serial.print(F("Pushed data from "));
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Serial.print(mqttClient.messageTopic());
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Serial.println(F(" topic to ZED"));
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while (mqttClient.available())
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{
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char ch = mqttClient.read();
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//Serial.write(ch); //Pipe to serial port is fine but beware, it's a lot of binary data
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mgaData[mgaCount++] = ch;
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if (mgaCount == sizeof(mgaData))
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break;
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}
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if (mgaCount > 0)
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{
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//Push MGA data to GNSS module over I2C
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myGNSS.pushRawData(mgaData, mgaCount, false);
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lastReceived_ms = millis();
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}
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}
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//Connect to MQTT broker, receive MGA, and push to ZED module over I2C
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void beginClient()
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{
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Serial.println(F("Subscribing to Broker. Press key to stop"));
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delay(10); //Wait for any serial to arrive
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while (Serial.available()) Serial.read(); //Flush
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while (Serial.available() == 0)
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{
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//Connect if we are not already
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if (wifiClient.connected() == false)
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{
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// Connect to AWS IoT
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wifiClient.setCACert(AWS_CERT_CA);
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wifiClient.setCertificate(AWS_CERT_CRT);
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wifiClient.setPrivateKey(AWS_CERT_PRIVATE);
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mqttClient.setId(MQTT_CLIENT_ID);
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mqttClient.setKeepAliveInterval(60*1000);
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mqttClient.setConnectionTimeout( 5*1000);
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if (!mqttClient.connect(AWS_IOT_ENDPOINT, AWS_IOT_PORT)) {
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Serial.print(F("MQTT connection failed! Error code = "));
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Serial.println(mqttClient.connectError());
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return;
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} else {
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Serial.println(F("You're connected to the PointPerfect MQTT broker: "));
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Serial.println(AWS_IOT_ENDPOINT);
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// Subscribe to MQTT and register a callback
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Serial.println(F("Subscribe to Topics"));
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mqttClient.onMessage(mqttMessageHandler);
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mqttClient.subscribe(MQTT_TOPIC_ASSISTNOW);
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lastReceived_ms = millis();
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} //End attempt to connect
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} //End connected == false
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else {
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mqttClient.poll();
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}
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//Close socket if we don't have new data for 10s
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if (millis() - lastReceived_ms > maxTimeBeforeHangup_ms)
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{
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Serial.println(F("Timeout. Disconnecting..."));
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if (mqttClient.connected() == true)
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mqttClient.stop();
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return;
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}
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delay(10);
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}
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Serial.println(F("User pressed a key"));
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Serial.println(F("Disconnecting..."));
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wifiClient.stop();
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}

‎examples/AssistNow/AssistNow_Online/Example5_AssistNowOnline_MQTT/secrets.h

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//Your WiFi credentials
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const char ssid[] = "<YOUR SSID>";
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const char password[] = "<YOUR PASSWORD>";
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// Below infomation you can set after signing up with u-blox Thingstream portal
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// and after add a new New PointPerfect Thing
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// https://portal.thingstream.io/app/location-services/things
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// in the new PointPerfect Thing you go to the credentials page and copy past the values and certificate into this.
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// <Your PointPerfect Thing> -> Credentials -> Hostname
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const char AWS_IOT_ENDPOINT[] = "pp.services.u-blox.com";
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const unsigned short AWS_IOT_PORT = 8883;
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// <Your PointPerfect Thing> -> Credentials -> AssistNow (MGA) topic
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const char MQTT_TOPIC_ASSISTNOW[] = "/pp/ubx/mga";
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// <Your PointPerfect Thing> -> Credentials -> Client Id
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static const char MQTT_CLIENT_ID[] = "<ADD YOUR CLIENT ID HERE>";
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// <Your PointPerfect Thing> -> Credentials -> Amazon Root Certificate
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static const char AWS_CERT_CA[] PROGMEM = R"EOF(
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-----BEGIN CERTIFICATE-----
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<ADD YOUR CERTICICATE HERE>
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-----END CERTIFICATE-----
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)EOF";
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// <Your PointPerfect Thing> -> Credentials -> Client Certificate
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static const char AWS_CERT_CRT[] PROGMEM = R"KEY(
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-----BEGIN CERTIFICATE-----
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<ADD YOUR CERTICICATE HERE>
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-----END CERTIFICATE-----
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)KEY";
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// Get this from Thingstream Portal
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// <Your PointPerfect Thing> -> Credentials -> Client Key
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static const char AWS_CERT_PRIVATE[] PROGMEM = R"KEY(
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-----BEGIN RSA PRIVATE KEY-----
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<ADD YOUR KEY HERE>
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-----END RSA PRIVATE KEY-----
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)KEY";

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