add status topic and publish after sending text to sign

RESTful version of simple socket listener.

LICENSE.txt

@@ -0,0 +1,7 @@
+Copyright 2024 Fabian Müller <fabian@fablab-altmuehlfranken.de>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

platformio.ini

@@ -13,10 +13,11 @@ platform = espressif8266
 framework = arduino
 monitor_speed = 115200
 upload_speed = 500000
+upload_protocol = espota
+upload_port = led-marquee-sign
 
 # Serial1 (sign data) maps to D4 by default
 [env:d1_mini]
 board = d1_mini
-
+lib_deps = adafruit/Adafruit MQTT Library@^2.5.8
-[env:nodemcuv2]
+lib_ignore = WiFi101
-board = nodemcuv2

src/credentials.h.example

@@ -5,4 +5,9 @@ namespace credentials {
     const String psk = "my PSK";
 
     const String mdnsHostname = "led-marquee-sign";
+
+    const String mqtt_hostname = "mqtt-broker";
+    const uint16_t mqtt_port = 1883;
+    const String mqtt_username = "user";
+    const String mqtt_password = "pass";
 }

src/main.cpp

@@ -1,6 +1,11 @@
+#include <ESP8266WiFi.h>
 #include <ESP8266WiFiMulti.h>
 #include <ESP8266mDNS.h>
 #include <ESP8266WebServer.h>
+#include <WiFiUdp.h>
+#include <ArduinoOTA.h>
+#include "Adafruit_MQTT.h"
+#include "Adafruit_MQTT_Client.h"
 
 #include "credentials.h"
 #include "webserver.h"
@@ -10,6 +15,18 @@
 static ESP8266WiFiMulti wifiMulti;
 static SocketServer socketServer;
 
+#define AIO_SERVER      credentials::mqtt_hostname.c_str()
+#define AIO_SERVERPORT  credentials::mqtt_port
+#define AIO_USERNAME    credentials::mqtt_username.c_str()
+#define AIO_KEY         credentials::mqtt_password.c_str()
+
+WiFiClient client;
+Adafruit_MQTT_Client mqtt(&client, AIO_SERVER, AIO_SERVERPORT, AIO_USERNAME, AIO_KEY);
+Adafruit_MQTT_Subscribe mqtt_subscribe_topic = Adafruit_MQTT_Subscribe(&mqtt, "homeassistant/marquee_sign/text/set");
+Adafruit_MQTT_Publish mqtt_publish_topic = Adafruit_MQTT_Publish(&mqtt, "homeassistant/marquee_sign/text/status");
+
+void MQTT_connect();
+
 void setup() {
     // serial console, for use via USB (also exposed to TXD0/RXD0 GPIOs)
     Serial.begin(115200);
@@ -20,7 +37,10 @@ void setup() {
     Serial1.begin(9600);
 
     // configure WiFi and connect to the network
+    WiFi.mode(WIFI_STA);
+    WiFi.hostname(credentials::mdnsHostname);
     wifiMulti.addAP(credentials::ssid.c_str(), credentials::psk.c_str());
+
     Serial.println("Connecting to Wi-Fi network...");
     while (wifiMulti.run() != WL_CONNECTED) {
         delay(1000);
@@ -32,16 +52,13 @@ void setup() {
     Serial.print(", IP address: ");
     Serial.println(WiFi.localIP());
 
+    ArduinoOTA.begin();
+
+    mqtt.subscribe(&mqtt_subscribe_topic);
+
     // might be handy to have the IP written on the sign
     sendTextToSign(WiFi.localIP().toString());
 
-    // publish this service using mDNS so that it's easy to find it in the LAN
-    if (MDNS.begin(credentials::mdnsHostname)) {
-        Serial.println("mDNS started up successfully");
-    } else {
-        Serial.println("Error: failed to start mDNS");
-    }
-
     // configure HTTP endpoints
     configureWebServer();
 
@@ -53,4 +70,43 @@ void setup() {
 void loop() {
     webServer.handleClient();
     socketServer.handleClient();
+
+    ArduinoOTA.handle();
+
+    MQTT_connect();
+
+    Adafruit_MQTT_Subscribe *subscription;
+    while ((subscription = mqtt.readSubscription(5000))) {
+        const char* signText = (char *)mqtt_subscribe_topic.lastread;
+
+        sendTextToSign(signText);
+
+        mqtt_publish_topic.publish(signText);
+    }
+}
+
+void MQTT_connect() {
+    int8_t ret;
+
+    // Stop if already connected.
+    if (mqtt.connected()) {
+        return;
+    }
+
+    uint8_t retries = 6;
+    // connect will return 0 for connected
+    while ((ret = mqtt.connect()) != 0) {
+        mqtt.disconnect();
+
+        // wait 10s till next try
+        for (int i = 0; i < 10000; i += 5) {
+            ArduinoOTA.handle();
+            delay(5);
+        }
+
+        retries--;
+        if (retries == 0) {
+            ESP.restart();
+        }
+    }
 }

src/util.h

@@ -1,5 +1,9 @@
 #pragma once
 
+#include <map>
+#include <set>
+#include <unordered_map>
+
 // TODO: reverse engineer builtin and custom bitmaps
 
 // seems like our sign listens to messages on this address
@@ -246,6 +250,95 @@ enum class ExtendedChar {
     GreekSmallLetterPhi = 0xed,
 };
 
+std::unordered_map<uint16_t, uint8_t> createUnicodeToCP437Map() {
+    std::unordered_map<uint16_t, uint8_t> cp437_map;
+
+    cp437_map[0x00E4] = 0x84;  // ä in UTF-16
+    cp437_map[0xC3A4] = 0x84;  // ä in UTF-8
+    cp437_map[0x00F6] = 0x94;  // ö in UTF-16
+    cp437_map[0xC3B6] = 0x94;  // ö in UTF-8
+    cp437_map[0x00FC] = 0x81;  // ü in UTF-16
+    cp437_map[0xC3BC] = 0x81;  // ü in UTF-8
+    cp437_map[0x00C4] = 0x8E;  // Ä in UTF-16
+    cp437_map[0xC384] = 0x8E;  // Ä in UTF-8
+    cp437_map[0x00D6] = 0x99;  // Ö in UTF-16
+    cp437_map[0xC396] = 0x99;  // Ö in UTF-8
+    cp437_map[0x00DC] = 0x9A;  // Ü in UTF-16
+    cp437_map[0xC39C] = 0x9A;  // Ü in UTF-8
+    cp437_map[0x00DF] = 0xE1;  // ß in UTF-16
+    cp437_map[0xC39F] = 0xE1;  // ß in UTF-8
+    cp437_map[0x20AC] = 0xB1;  // € in UTF-16
+    cp437_map[0xE282AC] = 0xB1;  // € in UTF-8 (3 Bytes)
+    cp437_map[0x00B5] = 0xE6;  // µ in UTF-16
+    cp437_map[0xC2B5] = 0xE6;  // µ in UTF-8
+
+    return cp437_map;
+}
+
+String convertToCP437(const String& input) {
+    std::unordered_map<uint16_t, uint8_t> cp437_map = createUnicodeToCP437Map();
+    String output = "";
+    size_t len = input.length();
+
+    for (size_t i = 0; i < len; i++) {
+        char ch = input[i];
+
+        // UTF-8 detection: check for 3 byte UTF-8
+        if ((ch & 0xF0) == 0xE0) {
+            if (i + 2 < len) {
+                uint32_t utf8_char = ((uint8_t)input[i] << 16) | ((uint8_t)input[i + 1] << 8) | (uint8_t)input[i + 2];
+                // skip 2 additional bytes
+                i += 2;
+                if (cp437_map.find(utf8_char) != cp437_map.end()) {
+                    output += static_cast<char>(cp437_map[utf8_char]);
+                    continue;
+                }
+            }
+        }
+        // UTF-8 detection: check for 2 byte UTF-8
+        else if ((ch & 0xE0) == 0xC0) {
+            if (i + 1 < len) {
+                uint16_t utf8_char = ((uint8_t)input[i] << 8) | (uint8_t)input[i + 1];
+                // skip second byte
+                i++;
+                if (cp437_map.find(utf8_char) != cp437_map.end()) {
+                    output += static_cast<char>(cp437_map[utf8_char]);
+                    continue;
+                }
+            }
+        }
+        // single UTF-16 character (or plain ANSI character)
+        else if ((uint8_t)ch < 0x80) {
+            // keep ASCII as is
+            output += ch;
+        }
+        else {
+            uint16_t utf16_char = (uint8_t)ch;
+            // check if character is in UTF-16 range, fallback to ?
+            if (cp437_map.find(utf16_char) != cp437_map.end()) {
+                output += static_cast<char>(cp437_map[utf16_char]);
+            } else {
+                output += '?';
+            }
+        }
+    }
+
+    return output;
+}
+
+String hexDump(String in) {
+    String out;
+    for (size_t i = 0; i < in.length(); ++i) {
+        auto hexChar = String(in[i], HEX);
+        if (hexChar.length() == 1) {
+            out.concat('0');
+        }
+        out.concat(hexChar);
+        out.concat(' ');
+    }
+    return out;
+}
+
 /*
  * Message syntax:
  * separator: ~
@@ -274,7 +367,6 @@ enum class ExtendedChar {
  *   - stay time: 4
  *   - brightness: bright
  */
-
 void sendTextToSign(
     const String &text,
     const Method method = Method::Cyclic,
@@ -294,18 +386,12 @@ void sendTextToSign(
 
     Serial.println("Sending text: \"" + text + "\"");
 
-    String toSend = "~" + String(SIGN_ADDRESS, DEC) + "~f01" + (char) method + "\\" + (char) brightness + "\\Y" + String(speed, DEC) + "\\Z" + String(stayTime, DEC) + "\\" + (char) fontType + text + "\r\r\r";
+    String translatedText = convertToCP437(text);
+
+    String toSend = "~" + String(SIGN_ADDRESS, DEC) + "~f01" + (char) method + "\\" + (char) brightness + "\\Y" + String(speed, DEC) + "\\Z" + String(stayTime, DEC) + "\\" + (char) fontType + translatedText + "\r\r\r";
 
     Serial1.print(toSend);
 
     Serial.println("Text sent to device: " + toSend);
-    Serial.print("Hex dump: ");
+    Serial.println("Hex dump: " + hexDump(toSend));
-    for (size_t i = 0; i < toSend.length(); ++i) {
-        auto hexChar = String(toSend[i], HEX);
-        if (hexChar.length() == 1) {
-            hexChar = '0' + hexChar;
-        }
-        Serial.print(hexChar + ' ');
-    }
-    Serial.println();
 }

src/webserver.h

@@ -66,6 +66,21 @@ namespace {
         sendTextToSign(text);
         webServer.send(200, "text/plain", "ok");
     }
+
+    // RESTful API endpoint -- returns a proper status code rather than a redirect
+    void handleRawApiSend() {
+        String toSend = webServer.arg("plain");
+
+        if (toSend.isEmpty()) {
+            webServer.send(404, "text/plain", "empty body");
+            return;
+        }
+
+        Serial.println("Raw message sent to device: " + toSend);
+        Serial.println("Hex dump: " + hexDump(toSend));
+        Serial1.print(toSend);
+        webServer.send(200, "text/plain", "ok");
+    }
 }
 
 void configureWebServer() {
@@ -74,4 +89,5 @@ void configureWebServer() {
     webServer.on("/", HTTPMethod::HTTP_GET, handleIndex);
     webServer.on("/", HTTPMethod::HTTP_POST, handleFormSend);
     webServer.on("/send", HTTPMethod::HTTP_POST, handleApiSend);
+    webServer.on("/raw", HTTPMethod::HTTP_POST, handleRawApiSend);
 }