diff --git a/code/platformio.ini b/code/platformio.ini
index 35096654..db3a4034 100644
--- a/code/platformio.ini
+++ b/code/platformio.ini
@@ -6,13 +6,16 @@ data_dir = espurna/data
 [common]
 # ------------------------------------------------------------------------------
 # PLATFORM:
-#   !! DO NOT confuse platformio's Esp8266 development platform with Arduino core for ESP8266
+#   !! DO NOT confuse platformio's ESP8266 development platform with Arduino core for ESP8266
+#   We use platformIO 1.5.0 as default
 #
-#   we use platformIO 1.5.0 as default
-#   platform 1.6.0 = arduino core 2.4.0 is required for newer features/boards
+#   platformIO 1.5.0 = arduino core 2.3.0
+#   platformIO 1.6.0 = arduino core 2.4.0
+#   platformIO 1.7.0 = arduino core 2.4.1
 # ------------------------------------------------------------------------------
 platform_150 = espressif8266@1.5.0
 platform_160 = espressif8266@1.6.0
+platform_170 = espressif8266@1.7.0
 platform = ${common.platform_150}
 
 # ------------------------------------------------------------------------------
@@ -26,8 +29,13 @@ debug_flags = -DDEBUG_ESP_CORE -DDEBUG_ESP_SSL -DDEBUG_ESP_WIFI -DDEBUG_ESP_HTTP
 #   build flags for 512k/1m ESP's are different because we use Linker Scripts to adjust flash split
 #   512 KB = 487 KB sketch, 20 KB eeprom
 #     1 MB = 999 KB sketch, 20 KB eeprom
+#
+# Available lwIP variants (macros):
+#    -DPIO_FRAMEWORK_ARDUINO_LWIP_HIGHER_BANDWIDTH v1.4 Higher Bandwidth (default)
+#    -DPIO_FRAMEWORK_ARDUINO_LWIP2_LOW_MEMORY v2 Lower Memory
+#    -DPIO_FRAMEWORK_ARDUINO_LWIP2_HIGHER_BANDWIDTH v2 Higher Bandwidth
 # ------------------------------------------------------------------------------
-build_flags = -g -DMQTT_MAX_PACKET_SIZE=400 ${env.ESPURNA_FLAGS}
+build_flags = -g -DMQTT_MAX_PACKET_SIZE=400 ${env.ESPURNA_FLAGS} -DPIO_FRAMEWORK_ARDUINO_LWIP_HIGHER_BANDWIDTH
 build_flags_512k = ${common.build_flags} -Wl,-Tesp8266.flash.512k0.ld
 build_flags_1m = ${common.build_flags} -Wl,-Tesp8266.flash.1m0.ld