first working(?) version

dhcp.c

@@ -353,8 +353,10 @@ void dhcp_stop(void) __banked
 }
 
 
-void dhcp_callback(void) __banked
+void dhcp_callback(uint16_t lport) __banked
 {
+	if (lport != HTONS(DHCPC_CLIENT_PORT)) // Is this call for us? If not, ignore it
+		return;
 	if (!dhcp_state.state)
 		return;
 	if (uip_closed()) {

dhcp.h

@@ -16,7 +16,7 @@
 void dhcp_start(void) __banked;
 void dhcp_stop(void) __banked;
 // void dhcp_periodic(void) __banked;
-void dhcp_callback(void) __banked;
+void dhcp_callback(uint16_t lport) __banked;
 
 
 struct dhcp_state {

syslog.c

@@ -38,7 +38,6 @@ void syslog_start(void) __banked
 		print_string("Started syslog to IP ");
 		itoa(syslog_addr[0]); write_char('.'); itoa(syslog_addr[0]>>8); write_char('.');
 		itoa(syslog_addr[1]); write_char('.'); itoa(syslog_addr[1]>>8); write_char('\n');
-
 		syslog_enabled = 1;
 	}
 	else {
@@ -58,8 +57,11 @@ void syslog_stop(void) __banked
 	}
 }
 
-void syslog_callback(void) __banked
+void syslog_callback(uint16_t lport) __banked
 {
+	if (lport != syslog_conn->lport)
+		return;
+
 	if ((logptr_r != logptr_w) && full_line_available)
 	{
 		int16_t log_size = logptr_w - logptr_r;

syslog.h

@@ -8,6 +8,6 @@
 void syslog_init(void) __banked;
 void syslog_start(void) __banked;
 void syslog_stop(void) __banked;
-void syslog_callback(void) __banked;
+void syslog_callback(uint16_t lport) __banked;
 
 #endif

udp_apps.c

@@ -1,17 +1,9 @@
 
-#include "stdint.h"
+#include "uip/uip.h"
 #include "udp_apps.h"
 
-static uint8_t callbacknr;
-
 void udp_callbacks(void)
 {
-	// Calling more than one callback from the same UIP_UDP_APPCALL does not work; we use a simple dispatcher
-	if (callbacknr == 0) {
-		dhcp_callback();
-		callbacknr = 1;
-	} else  {
-		syslog_callback();
-		callbacknr = 0;
-	}
+	dhcp_callback(uip_udp_conn->lport); 	// let the application decide if this is for it or not
+	syslog_callback(uip_udp_conn->lport);	// let the application decide if this is for it or not
 }