fix: multi-client connection issues on Portenta H7

Author: leonardocavagnis

variants/arduino_portenta_h7_stm32h747xx_m7/arduino_portenta_h7_stm32h747xx_m7.conf

@@ -75,7 +75,7 @@ CONFIG_NET_L2_ETHERNET_MGMT=y
 CONFIG_NET_TX_STACK_SIZE=8192
 CONFIG_NET_RX_STACK_SIZE=8192
 CONFIG_NET_TCP_WORKQ_STACK_SIZE=8192
-CONFIG_NET_MGMT_EVENT_STACK_SIZE=8192
+CONFIG_NET_MGMT_EVENT_STACK_SIZE=4608
 CONFIG_NET_TCP=y
 CONFIG_NET_SOCKETS=y
 CONFIG_POSIX_API=y
@@ -114,3 +114,11 @@ CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=2048
 CONFIG_BT_RX_STACK_SIZE=4096
 
 CONFIG_STM32H7_BOOT_M4_AT_INIT=n
+
+CONFIG_NET_MGMT_EVENT_QUEUE_SIZE=32
+CONFIG_NET_MGMT_EVENT_QUEUE_TIMEOUT=5000
+CONFIG_NET_MAX_CONTEXTS=10
+CONFIG_NET_MAX_CONN=10
+
+CONFIG_NET_CONFIG_AUTO_INIT=n
+CONFIG_NET_CONNECTION_MANAGER=y