correct interface passed to address compare. (ARMmbed#1768)

Author: deepakvenugopal

source/6LoWPAN/Thread/thread_extension_bbr.c

@@ -454,11 +454,12 @@ static int thread_pbbr_bb_qry_cb(int8_t service_id, uint8_t source_address[16],
 
     link_configuration_s *link_configuration_ptr = thread_joiner_application_get_config(this->interface_id);
     protocol_interface_info_entry_t *cur = protocol_stack_interface_info_get_by_id(this->interface_id);
+    protocol_interface_info_entry_t *backbone_if = protocol_stack_interface_info_get_by_id(this->backbone_interface_id);
 
-    if (!link_configuration_ptr || !cur) {
+    if (!link_configuration_ptr || !cur || !backbone_if) {
         return -1;
     }
-    if (addr_interface_address_compare(cur, source_address) == 0) {
+    if (addr_interface_address_compare(backbone_if, source_address) == 0) {
         // Received from own address no need to process
         return 0;
     }
@@ -584,11 +585,12 @@ static int thread_pbbr_bb_ans_cb(int8_t service_id, uint8_t source_address[16],
     }
     link_configuration_s *link_configuration_ptr = thread_joiner_application_get_config(this->interface_id);
     protocol_interface_info_entry_t *cur = protocol_stack_interface_info_get_by_id(this->interface_id);
+    protocol_interface_info_entry_t *backbone_if = protocol_stack_interface_info_get_by_id(this->backbone_interface_id);
 
-    if (!link_configuration_ptr || !cur) {
+    if (!link_configuration_ptr || !cur || !backbone_if) {
         return -1;
     }
-    if (addr_interface_address_compare(cur, source_address) == 0) {
+    if (addr_interface_address_compare(backbone_if, source_address) == 0) {
         // Received from own address no need to process
         return 0;
     }
@@ -1073,7 +1075,7 @@ static int thread_extension_bbr_pbbr_start(thread_pbbr_t *this)
     // Generate pbbr multicast address
     memset(this->pbbr_multicast_address, 0, 16);
     this->pbbr_multicast_address[0] = 0xff;
-    this->pbbr_multicast_address[1] = 0x30 | 3; //Thread specification says p and t bits are 1 Scope is should be 2
+    this->pbbr_multicast_address[1] = 0x32; //Thread specification says p and t bits are 1
     this->pbbr_multicast_address[2] = 0x00; //Reserved
     this->pbbr_multicast_address[3] = 0x40; //Prefix length 64 bits
     thread_extension_network_prefix_get(cur->id, NULL, &this->pbbr_multicast_address[4], NULL);