add script to compress firmware before ota upload (#1065)

* add script to compress firmware before ota upload

* add examples for OTA flashing/updating Sonoff RF Bridge

- use compress script to save space uploading firmware
- use "board_build.ldscript = eagle.flash.1m64.ld" to free some additional space for OTA flashing.

platformio.ini

@@ -195,6 +195,8 @@ build_flags =
   '-DGateway_Name="OpenMQTTGateway_SRFB"'
   '-UMQTTsetMQTT' ;We remove this function to have sufficient FLASH available for OTA, you should also use ESPWifiManualSetup to save flash memory and have OTA working
 board_build.flash_mode = dout
+board_build.ldscript = eagle.flash.1m64.ld ;this frees more space for firmware uplad via OTA.
+;extra_scripts = scripts/compressFirmware.py ;uncomment this to compress the firmware. This helps updating e.g. Sonoff RF Bridge via OTA flash by saving space for the uploaded firmware.
 
 [env:esp32dev-all-test]
 platform = ${com.esp32_platform}
@@ -1071,3 +1073,5 @@ build_flags =
 	'-DINPUT_GPIO=0'
 	'-DGateway_Name="OpenMQTTGateway_SRFB_Direct"'
 board_build.flash_mode = dout
+board_build.ldscript = eagle.flash.1m64.ld ;this frees more space for firmware uplad via OTA.
+;extra_scripts = scripts/compressFirmware.py ;uncomment this to compress the firmware. This helps updating e.g. Sonoff RF Bridge via OTA flash by saving space for the uploaded firmware.

prod_env.ini.example

@@ -78,3 +78,50 @@ build_flags =
   '-DMQTT_PASS="abcdefghi"'
   '-DMQTT_SERVER="192.168.1.17"'
   '-DDEFAULT_LOW_POWER_MODE=2'
+
+;hacked Sonoff RF-Bridge
+[env:sonoff-rfbridge-hacked]
+platform = ${com.esp8266_platform}
+board = esp8285
+lib_deps = 
+	${com-esp.lib_deps}
+	${libraries.esppilight}
+build_flags = 
+	${com-esp.build_flags}
+	'-DZgatewayPilight="Pilight"'
+	'-DRF_RECEIVER_GPIO=4'
+	'-DRF_EMITTER_GPIO=5'
+	'-DLED_INFO=13'
+	'-DLED_INFO_ON=0'
+	'-DZsensorGPIOInput="GPIOInput"'
+	'-DINPUT_GPIO=0'
+	'-DGateway_Name="OpenMQTTGateway_SRFB_Direct"'
+board_build.flash_mode = dout
+board_build.ldscript = eagle.flash.1m64.ld ;this frees more space for firmware uplad via OTA.
+
+;hacked Sonoff RF-Bridge OTA flash
+[env:sonoff-rfbridge-hacked-ota]
+upload_protocol = espota
+upload_port = <ip> ;change this to the ip address of you SRFB
+upload_speed = 512000
+upload_flags = 
+    --auth=OTAPASSWORD
+    --port=8266
+platform = ${com.esp8266_platform}
+board = esp8285
+lib_deps = 
+	${com-esp.lib_deps}
+	${libraries.esppilight}
+build_flags = 
+	${com-esp.build_flags}
+	'-DZgatewayPilight="Pilight"'
+	'-DRF_RECEIVER_GPIO=4'
+	'-DRF_EMITTER_GPIO=5'
+	'-DLED_INFO=13'
+	'-DLED_INFO_ON=0'
+	'-DZsensorGPIOInput="GPIOInput"'
+	'-DINPUT_GPIO=0'
+	'-DGateway_Name="OpenMQTTGateway_SRFB_Direct"'
+board_build.flash_mode = dout
+extra_scripts = scripts/compressFirmware.py
+board_build.ldscript = eagle.flash.1m64.ld ;this frees more space for firmware uplad. Should also be uses for initial flash via serial

scripts/compressFirmware.py

@@ -0,0 +1,33 @@
+import gzip
+import shutil
+import os
+Import("env")
+
+
+def compressFirmware(source, target, env):
+    """ Compress firmware using gzip for 'compressed OTA upload' """
+    SOURCE_FILE = env.subst("$BUILD_DIR") + os.sep + env.subst("$PROGNAME") + ".bin"
+    SOURCE_BAK = SOURCE_FILE + '.bak'
+    do_compress = True
+    if os.path.exists(SOURCE_FILE) and os.path.exists(SOURCE_BAK):
+        src_mtime = os.stat(SOURCE_FILE).st_mtime
+        bak_mtime = os.stat(SOURCE_BAK).st_mtime
+        """ Recompress if .bin file is newer than .bak file """
+        do_compress = (src_mtime > bak_mtime)
+
+    if do_compress:
+        print("Compressing firmware for upload...")
+        shutil.move(SOURCE_FILE, SOURCE_BAK)
+        with open(SOURCE_BAK, 'rb') as f_in:
+            with gzip.open(SOURCE_FILE, 'wb', compresslevel = 9) as f_out:
+                shutil.copyfileobj(f_in, f_out)
+        """ Set modification time on compressed file so incremental build works """
+        shutil.copystat(SOURCE_BAK, SOURCE_FILE)
+
+    if os.path.exists(SOURCE_BAK):
+        ORG_FIRMWARE_SIZE = os.stat(SOURCE_BAK).st_size
+        GZ_FIRMWARE_SIZE = os.stat(SOURCE_FILE).st_size
+
+        print("Compression reduced firmware size to {:.0f}% (was {} bytes, now {} bytes)".format((GZ_FIRMWARE_SIZE / ORG_FIRMWARE_SIZE) * 100, ORG_FIRMWARE_SIZE, GZ_FIRMWARE_SIZE))
+
+env.AddPostAction("$BUILD_DIR/firmware.bin", [compressFirmware])