Disable BLE Client role to save space

Author: Links2004

arch/esp32/esp32.ini

@@ -33,6 +33,7 @@ build_flags =
   -DCONFIG_BT_NIMBLE_ENABLED
   -DNIMBLE_TWO
   -DCONFIG_NIMBLE_CPP_LOG_LEVEL=2
+  -DCONFIG_BT_NIMBLE_ROLE_CENTRAL_DISABLED
   -DCONFIG_BT_NIMBLE_MAX_CCCDS=20
   -DCONFIG_BT_NIMBLE_HOST_TASK_STACK_SIZE=8192
   -DESP_OPENSSL_SUPPRESS_LEGACY_WARNING