Using lwip sntp to set the RTC.

src/CMakeLists.txt

@@ -1,7 +1,6 @@
 #set(CMAKE_INCLUDE_CURRENT_DIR ON)
 
 set(SOURCES
-  ntp_time.cpp
   abfall.cpp
 )
 
@@ -16,6 +15,21 @@ target_include_directories(${CMAKE_PROJECT_NAME} PRIVATE
   ${CMAKE_CURRENT_LIST_DIR}/.. # for our common lwipopts or any other standard includes, if required
 )
 
+#add_definitions(
+#  -DSNTP_SERVER_DNS=1
+#  -DSNTP_SERVER_ADDRESS="pool.ntp.org"
+#  -DSNTP_STARTUP_DELAY=0
+#  -DSNTP_SET_SYSTEM_TIME=set_system_time
+#)
+
+target_compile_definitions(${CMAKE_PROJECT_NAME} PRIVATE
+  SNTP_SERVER_DNS=1
+  SNTP_SERVER_ADDRESS="pool.ntp.org"
+  SNTP_STARTUP_DELAY=0
+  SNTP_SET_SYSTEM_TIME=set_system_time
+  SNTP_UPDATE_DELAY=86400
+)
+
 set_target_properties(${CMAKE_PROJECT_NAME}
   PROPERTIES
   CMAKE_ARCHIVE_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}"
@@ -30,6 +44,7 @@ target_link_libraries(${CMAKE_PROJECT_NAME}
   pico_stdlib
   pico_cyw43_arch_lwip_threadsafe_background
   pico_lwip_http
+  pico_lwip_sntp
   hardware_rtc
 )