handle buildweb condition when its part of a pio chain

platformio.ini

@@ -98,9 +98,7 @@ build_flags =
 build_unflags = 
   ${common.unbuild_flags}
 extra_scripts =
-  ; pre:scripts/build_interface.py ; builds the WebUI
   scripts/rename_fw.py ; renames the firmware .bin file
-  ; scripts/upload.py ; optionally upload the firmware via OTA (if upload_protocol = custom)
 monitor_speed = 115200
 monitor_filters = direct
 build_type = release
@@ -274,8 +272,24 @@ lib_deps = Unity
 test_testing_command =
   ${platformio.build_dir}/${this.__env__}/program
 
+; Modbus
+;  Creating the modbus registers is a multi-step process. Before it was in a shell script called generate_csv_and_headers.sh
+;  but now moved to pio so everything is in python and cross-platform. The logic is as follows:
+;  1. create a dummy modbus_entity_parameters.hpp file so the first pass compiles
+;  2. compile the EMS-ESPcode with the EMSESP_MODBUS flag set
+;  3. run the entity_dump test command and generate the dump_entities.csv file
+;  4. use the dump_entities.csv file with update_modbus_registers.py script to generate the modbus_entity_parameters.hpp file
+;  5. clean up everything and start again with the EMSESP_STANDALONE flag set
+;  6. run the entity_dump test command again to create the real dump_entities.csv file
+;  7. create the Modbus-Entity-Registers.md file
+;  8. create the dump_telegrams.csv file
+;
+;  To run this in pio use the steps
+;   pio run -e build_modbus
+;   pio run -e build_standalone -t clean -t build
+
 # builds the modbus_entity_parameters.hpp header file
-# pio run -e build_modbus -t build 
+# pio run -e build_modbus
 [env:build_modbus]
 extends = env:native
 targets = build
@@ -287,8 +301,7 @@ custom_test_command = entity_dump
 custom_output_file = dump_entities.csv
 custom_post_script = scripts/build_modbus_entity_parameters_post.py
 
-; builds the real dump_entities.csv and dump_telegrams.csv files
-; and the Modbus-Entity-Registers.md file
+; builds the real dump_entities.csv and dump_telegrams.csv files, and also the Modbus-Entity-Registers.md file
 ; to be run after build_modbus with: pio run -e build_standalone -t clean -t build
 [env:build_standalone]
 extends = env:native