Use fixed version of expressif library to prevent linker error.

Log if taking a measurement with the BME280 sensor has failed.
Formatting

examples/demo-relay-contact-nodes.cpp

@@ -84,10 +84,12 @@ void setup()
          << endl;
 
   // Set callback for contact node here, just to show alternative
-  contactNode.onChange([](bool open)
-                       {
-    // Pass 0 in timeout for infinite "on"
-    relay1.setRelay(open, 0); });
+  contactNode.onChange(
+      [](bool open)
+      {
+        // Pass 0 in timeout for infinite "on"
+        relay1.setRelay(open, 0);
+      });
 
   // Set default configuration values before Homie.setup()
   relay1.beforeHomieSetup();

platformio.ini

@@ -17,13 +17,13 @@ serial_speed = 74880
 display = DISPLAY_SERIAL
 
 [env]
-platform = espressif8266
+platform = espressif8266@4.1.0 ; July 2023: newer expressif platform versions cause a linker error.
 framework = arduino
 build_flags = -D ${defines.display} -D SERIAL_SPEED=${defines.serial_speed}
 ; (Un)comment the libraries that you do (not) have installed in your global library storage.
 lib_deps =
-  ; User homie directly, because the official release is not compatible with ESP8266 3.x
-  https://github.com/homieiot/homie-esp8266.git
+  ; Use homie directly, because the official release is not compatible with ESP8266 3.x
+  https://github.com/luebbe/homie-esp8266.git
   ; Homie
   Adafruit BusIO
   Adafruit Unified Sensor
@@ -47,5 +47,11 @@ upload_speed = 230400
 
 [env:d1_mini]
 board = d1_mini
-; upload_port = 192.168.0.58
+upload_speed = 460800 ;230400
+; upload_port = 192.168.0.99
 ; upload_protocol = espota
+
+; [env:esp_adc]
+; board = esp12e
+; #512 kb for ESP-ADC (in-circuit)
+; build_flags = ${env.build_flags} -Wl,-Tesp8266.flash.512k64.ld -D HOMIE_MDNS=0 -D HOMIE_CONFIG=0

src/BME280Node.cpp

@@ -82,15 +82,22 @@ void BME280Node::send()
 
 void BME280Node::takeMeasurement()
 {
-  bme.takeForcedMeasurement(); // has no effect in normal mode
-
-  temperature = bme.readTemperature();
-  humidity = bme.readHumidity();
-  pressure = bme.readPressure() / 100;
+  // has no effect in normal mode
+  if (bme.takeForcedMeasurement())
+  {
+    temperature = bme.readTemperature();
+    humidity = bme.readHumidity();
+    pressure = bme.readPressure() / 100;
 
-  fixRange(&temperature, cMinTemp, cMaxTemp);
-  fixRange(&humidity, cMinHumid, cMaxHumid);
-  fixRange(&pressure, cMinPress, cMaxPress);
+    fixRange(&temperature, cMinTemp, cMaxTemp);
+    fixRange(&humidity, cMinHumid, cMaxHumid);
+    fixRange(&pressure, cMinPress, cMaxPress);
+  }
+  else
+  {
+    printCaption();
+    Homie.getLogger() << cIndent << F("Failed to take measurement") << endl;
+  }
 }
 
 void BME280Node::beforeHomieSetup()
@@ -114,7 +121,7 @@ void BME280Node::setup()
   if (bme.begin(_i2cAddress))
   {
     _sensorFound = true;
-    Homie.getLogger() << cIndent << F("found. Reading interval: ") << readInterval() << " ms" << endl;
+    Homie.getLogger() << cIndent << F("found. Reading interval: ") << readInterval() << F(" ms") << endl;
     // Parameters taken from the weather station monitoring example (advancedsettings.ino) in
     // the Adafruit BME280 library
     bme.setSampling(Adafruit_BME280::MODE_FORCED, _tempSampling, _pressSampling, _humSampling, _filter);