It should compile again.

269b8b2f · Eric Duminil · b52c675f · 269b8b2f
Commit 269b8b2f authored Mar 23, 2022 by Eric Duminil
--- a/ampel-firmware/co2_sensor.cpp
+++ b/ampel-firmware/co2_sensor.cpp
@@ -18,7 +18,9 @@ namespace config {
 }
 #if defined(ESP8266)
-// ???
+// For ESP8266 : RX on GPIO3, TX on GPIO1
+//TODO: Really not sure it works
+#   define S8_UART_PORT  0
 #endif
 #if defined(ESP32)
 // For ESP32 : RX on GPIO17, TX on GPIO16