Raise unixsim resources for mqtt

ports/unix/unixsim/lwipopts.h

@@ -107,13 +107,13 @@ a lot of data that needs to be copied, this should be set high. */
 #define MEMP_NUM_RAW_PCB        3
 /* MEMP_NUM_UDP_PCB: the number of UDP protocol control blocks. One
    per active UDP "connection". */
-#define MEMP_NUM_UDP_PCB        6
+#define MEMP_NUM_UDP_PCB        7
 /* MEMP_NUM_TCP_PCB: the number of simulatenously active TCP
    connections. */
-#define MEMP_NUM_TCP_PCB        5
+#define MEMP_NUM_TCP_PCB        6
 /* MEMP_NUM_TCP_PCB_LISTEN: the number of listening TCP
    connections. */
-#define MEMP_NUM_TCP_PCB_LISTEN 8
+#define MEMP_NUM_TCP_PCB_LISTEN 9
 /* MEMP_NUM_TCP_SEG: the number of simultaneously queued TCP
    segments. */
 #define MEMP_NUM_TCP_SEG        16
@@ -126,7 +126,7 @@ a lot of data that needs to be copied, this should be set high. */
 /* MEMP_NUM_NETBUF: the number of struct netbufs. */
 #define MEMP_NUM_NETBUF         2
 /* MEMP_NUM_NETCONN: the number of struct netconns. */
-#define MEMP_NUM_NETCONN        10
+#define MEMP_NUM_NETCONN        11
 /* MEMP_NUM_TCPIP_MSG_*: the number of struct tcpip_msg, which is used
    for sequential API communication and incoming packets. Used in
    src/api/tcpip.c. */
@@ -224,7 +224,7 @@ a lot of data that needs to be copied, this should be set high. */
 /* ---------- DHCP options ---------- */
 /* Define LWIP_DHCP to 1 if you want DHCP configuration of
    interfaces. */
-#define LWIP_DHCP               0
+#define LWIP_DHCP               1
 
 #define LWIP_DHCP_GET_NTP_SRV   (LWIP_DHCP)
 
@@ -241,7 +241,7 @@ a lot of data that needs to be copied, this should be set high. */
 extern void sntp_set_system_time(u32_t sec);
 #define SNTP_SET_SYSTEM_TIME(s) sntp_set_system_time(s)
 
-/* ---------- SNMP options ---------- */
+/* ---------- MQTT options ---------- */
 #define LWIP_MQTT               1
 
 /* ---------- SNMP options ---------- */