add buffer to hci_connection_t to allow for ACL recombination

src/hci.c

@@ -109,6 +109,7 @@ static hci_connection_t * create_connection_for_addr(bd_addr_t addr){
     linked_item_set_user(&conn->timeout.item, conn);
     conn->timeout.process = hci_connection_timeout_handler;
     hci_connection_timestamp(conn);
+    conn->acl_recombination_length = 0;
     linked_list_add(&hci_stack.connections, (linked_item_t *) conn);
     return conn;
 }

src/hci.h

@@ -151,6 +151,10 @@ typedef struct {
     timer_source_t timeout;
     struct timeval timestamp;
 
+    // ACL packet recombination
+    uint8_t  acl_recombination_buffer[350]; // max packet: DH5 = header(4) + payload (339)
+    uint16_t acl_recombination_length;
+    
 } hci_connection_t;
 
 /**