Basic implementation

.gitignore

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

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
+
+[platformio]
+default_envs = 
+  esp32dev
+
+[env]
+framework = arduino
+lib_ldf_mode = deep
+monitor_speed = 115200
+lib_deps = 
+  /Users/mairas/src/SK/SensESP
+  Adafruit SSD1306
+  
+[espressif32_base]
+platform = espressif32
+build_unflags = -Werror=reorder
+board_build.partitions = min_spiffs.csv
+monitor_filters = esp32_exception_decoder
+
+[env:esp32dev]
+extends = espressif32_base
+board = esp32dev
+build_flags = 
+  -D LED_BUILTIN=2

src/main.cpp

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+#include <Adafruit_GFX.h>
+#include <Adafruit_SSD1306.h>
+#include <Arduino.h>
+
+#include "sensesp_app.h"
+#include "sensesp_app_builder.h"
+#include "signalk/signalk_output.h"
+
+// SDA and SCL pins on SH-ESP32
+#define SDA_PIN 16
+#define SCL_PIN 17
+
+// Opto in pin on SH-ESP32
+#define OPTO_IN_PIN 35
+
+// OLED display width and height, in pixels
+#define SCREEN_WIDTH 128
+#define SCREEN_HEIGHT 64
+
+// define temperature display units
+#define TEMP_DISPLAY_FUNC KelvinToCelsius
+//#define TEMP_DISPLAY_FUNC KelvinToFahrenheit
+
+TwoWire* i2c;
+Adafruit_SSD1306* display;
+
+/// Clear a text row on an Adafruit graphics display
+void ClearRow(int row) { display->fillRect(0, 8 * row, SCREEN_WIDTH, 8, 0); }
+
+/**
+ * @brief Send Engine Dynamic Parameter data
+ *
+ * Send engine temperature data using the Engine Dynamic Parameter PGN.
+ * All unused fields that are sent with undefined value except the status
+ * bit fields are sent as zero. Hopefully we're not resetting anybody's engine
+ * warnings...
+ */
+
+ReactESP app([]() {
+// Some initialization boilerplate when in debug mode...
+#ifndef SERIAL_DEBUG_DISABLED
+  SetupSerialDebug(115200);
+#endif
+
+  SensESPAppBuilder builder;
+
+  sensesp_app = builder.set_hostname("nmea1_test")
+                    ->set_standard_sensors(NONE)
+                    ->get_app();
+
+  // initialize the display
+  i2c = new TwoWire(0);
+  i2c->begin(SDA_PIN, SCL_PIN);
+  display = new Adafruit_SSD1306(SCREEN_WIDTH, SCREEN_HEIGHT, i2c, -1);
+  if (!display->begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
+    debugW("SSD1306 allocation failed");
+  }
+  delay(100);
+  display->setRotation(2);
+  display->clearDisplay();
+  display->setTextSize(1);
+  display->setTextColor(SSD1306_WHITE);
+  display->setCursor(0, 0);
+  display->printf("Host: %s", sensesp_app->get_hostname().c_str());
+  display->display();
+
+  // initialize Serial1 on the opto_in pin
+
+  Serial1.begin(4800, SERIAL_8N1, OPTO_IN_PIN, -1, true);
+
+  app.onAvailable(Serial1, []() {
+    Serial.write(Serial1.read());
+  });
+
+  sensesp_app->enable();
+});