# This is a collection of sdkconfig settings that frees RAM at runtime,
# at the expense of performance.
#
# Not all options will work on all SoC families, but adding this sdkconfig
# set to a board should increase the free memory.
#
# - Many options free IRAM, which on most ESP32 families leads to
#   free DRAM at runtime (original ESP32 and S2 may not).
# - The other options reduce runtime DRAM usage from the heap.
#
# IMPORTANT: If you enable these config settings on a custom build then you may
# encounter bugs or crashes. If you choose to open a MicroPython bug report then
# please mention these config settings!

# Place functions in flash whenever possible to free IRAM
CONFIG_RINGBUF_PLACE_FUNCTIONS_INTO_FLASH=y
CONFIG_FREERTOS_PLACE_FUNCTIONS_INTO_FLASH=y
CONFIG_HEAP_PLACE_FUNCTION_INTO_FLASH=y

# Use the SPI flash functions in ROM (when available). This may limit flash chip
# support and cause issues with some flash chips. Each SoC family has different
# set of chip support baked into ROM.
CONFIG_SPI_FLASH_ROM_IMPL=y

# Run the Bluetooth controller from flash not IRAM
CONFIG_BT_CTRL_RUN_IN_FLASH_ONLY=y

# lwIP adjustments to limit runtime memory usage (at expense of performance, and/or
# a reduction in number of active connections).
CONFIG_LWIP_TCPIP_RECVMBOX_SIZE=16
CONFIG_LWIP_MAX_SOCKETS=6
CONFIG_LWIP_MAX_ACTIVE_TCP=8

# These lwIP values are recommended to scale relative to the Wi-Fi buffer numbers
CONFIG_LWIP_TCP_WND_DEFAULT=3072
CONFIG_LWIP_TCP_SND_BUF_DEFAULT=3072

# Wi-Fi adjustments to reduce peak runtime memory usage, at expense of peak
# performance
CONFIG_ESP_WIFI_STATIC_RX_BUFFER_NUM=8
CONFIG_ESP_WIFI_DYNAMIC_RX_BUFFER_NUM=12
CONFIG_ESP_WIFI_DYNAMIC_TX_BUFFER_NUM=12
CONFIG_ESP_WIFI_RX_MGMT_BUF_NUM_DEF=2
CONFIG_ESP_WIFI_RX_BA_WIN=12