nodemcu-firmware/sdkconfig.defaults

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# set custom partition table for 1.5MB firmware
CONFIG_PARTITION_TABLE_CUSTOM_FILENAME="components/platform/partitions.csv"
CONFIG_PARTITION_TABLE_FILENAME="components/platform/partitions.csv"
CONFIG_PARTITION_TABLE_SINGLE_APP=n
CONFIG_PARTITION_TABLE_TWO_OTA=n
CONFIG_PARTITION_TABLE_CUSTOM=y
# Default to 4MB for builds
CONFIG_ESPTOOLPY_FLASHSIZE_4MB=y
# Don't warn about undefined variables
CONFIG_MAKE_WARN_UNDEFINED_VARIABLES=n
# Empirical value to prevent a firmware crash due to stack overflow.
CONFIG_MAIN_TASK_STACK_SIZE=8192
# Enable address reuse for sockets in TIME_WAIT
# see https://github.com/nodemcu/nodemcu-firmware/pull/1838
CONFIG_LWIP_SO_REUSE=y
# Decrease the duration of sockets in TIME_WAIT
# see https://github.com/nodemcu/nodemcu-firmware/issues/1836
CONFIG_TCP_MSL=5000
# Allow writing to dangerous regions to avoid boot loops when creating filesystem
# Symptom:
# Mounting flash filesystem...
# No filesystem partition found, attempting to create it...
# abort() was called at PC 0x400ecddd on core 0
CONFIG_SPI_FLASH_WRITING_DANGEROUS_REGIONS_ALLOWED=y
# Enable panic handler for task wdt to reset the firmware upon wdt timeout
CONFIG_TASK_WDT_PANIC=y
# Disable advanced features by default
CONFIG_MQTT_TRANSPORT_SSL=n
CONFIG_MQTT_TRANSPORT_WEBSOCKET=n
CONFIG_MQTT_USE_CUSTOM_CONFIG=n
# Disable esp-idf's bluetooth component by default.
# The bthci module is also disabled and will enable bt when selected
CONFIG_BT_ENABLED=n
# Set "Release" code optimization level for -Os
CONFIG_OPTIMIZATION_LEVEL_RELEASE=y