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# SH-ESP32 NMEA 2000 gateway
SH-ESP32 NMEA 2000 gateway is an NMEA 2000 USB gateway software for the [SH-ESP32](https://hatlabs.github.io/sh-esp32) development board, available for purchase at https://hatlabs.fi.
Full documentation for SH-ESP32 NMEA 2000 gateway is available at https://hatlabs.github.io/sh-esp32.

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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 =
mairas/ReactESP
ttlappalainen/NMEA2000-library
ttlappalainen/NMEA2000_esp32
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

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#include <Arduino.h>
#define CAN_RX_PIN GPIO_NUM_34
#define CAN_TX_PIN GPIO_NUM_32
#define SDA_PIN 16
#define SCL_PIN 17
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <N2kMessages.h>
#include <ActisenseReader.h>
#include <NMEA2000_esp32.h>
#include "ReactESP.h"
#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels
TwoWire* i2c;
Stream *read_stream=&Serial;
Stream *forward_stream=&Serial;
tActisenseReader actisense_reader;
Adafruit_SSD1306* display;
tNMEA2000* nmea2000;
void ToggleLed() {
static bool led_state = false;
digitalWrite(LED_BUILTIN, led_state);
led_state = !led_state;
}
int num_n2k_messages = 0;
void HandleStreamN2kMsg(const tN2kMsg &message) {
// N2kMsg.Print(&Serial);
num_n2k_messages++;
ToggleLed();
}
int num_actisense_messages = 0;
void HandleStreamActisenseMsg(const tN2kMsg &message) {
// N2kMsg.Print(&Serial);
num_actisense_messages++;
ToggleLed();
nmea2000->SendMsg(message);
}
ReactESP app([]() {
// setup serial output
Serial.begin(115200);
delay(100);
// toggle the LED pin at rate of 1 Hz
pinMode(LED_BUILTIN, OUTPUT);
app.onRepeatMicros(1e6 / 1, []() {
ToggleLed();
});
// instantiate the NMEA2000 object
nmea2000 = new tNMEA2000_esp32(CAN_TX_PIN, CAN_RX_PIN);
// input the NMEA 2000 messages
// Reserve enough buffer for sending all messages. This does not work on small
// memory devices like Uno or Mega
nmea2000->SetN2kCANSendFrameBufSize(250);
nmea2000->SetN2kCANReceiveFrameBufSize(250);
// Set Product information
nmea2000->SetProductInformation(
"20210331", // Manufacturer's Model serial code
103, // Manufacturer's product code
"SH-ESP32 NMEA 2000 USB GW", // Manufacturer's Model ID
"0.1.0.0 (2021-03-31)", // Manufacturer's Software version code
"0.0.3.1 (2021-03-07)" // Manufacturer's Model version
);
// Set device information
nmea2000->SetDeviceInformation(
1, // Unique number. Use e.g. Serial number.
130, // Device function=Analog to NMEA 2000 Gateway. See codes on
// http://www.nmea.org/Assets/20120726%20nmea%202000%20class%20&%20function%20codes%20v%202.00.pdf
25, // Device class=Inter/Intranetwork Device. See codes on
// http://www.nmea.org/Assets/20120726%20nmea%202000%20class%20&%20function%20codes%20v%202.00.pdf
2046 // Just choosen free from code list on
// http://www.nmea.org/Assets/20121020%20nmea%202000%20registration%20list.pdf
);
nmea2000->SetForwardStream(forward_stream);
nmea2000->SetMode(tNMEA2000::N2km_ListenAndNode);
// nmea2000->SetForwardType(tNMEA2000::fwdt_Text); // Show bus data in clear text
nmea2000->SetForwardOwnMessages(false); // do not echo own messages.
nmea2000->SetMsgHandler(HandleStreamN2kMsg);
nmea2000->Open();
actisense_reader.SetReadStream(read_stream);
actisense_reader.SetDefaultSource(75);
actisense_reader.SetMsgHandler(HandleStreamActisenseMsg);
// No need to parse the messages at every single loop iteration; 1 ms will do
app.onRepeat(1, []() {
nmea2000->ParseMessages();
actisense_reader.ParseMessages();
});
// 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)) {
Serial.println(F("SSD1306 allocation failed"));
}
delay(100);
display->setRotation(2);
display->clearDisplay();
display->display();
// update results
app.onRepeat(1000, []() {
display->clearDisplay();
display->setTextSize(1);
display->setCursor(0, 0);
display->setTextColor(SSD1306_WHITE);
display->printf("SH-ESP32 N2K USB GW\n");
display->printf("Uptime: %lu\n", millis() / 1000);
display->printf("RX: %d\n", num_n2k_messages);
display->printf("TX: %d\n", num_actisense_messages);
display->display();
num_n2k_messages = 0;
num_actisense_messages = 0;
});
});