recv discovery packets with max size buffer (we dont know what to expect)

1 files changed, 5 insertions, 4 deletions

diff --git a/host/lib/usrp/usrp2/usrp2_impl.cpp b/host/lib/usrp/usrp2/usrp2_impl.cpp
index af3ec216a..1e6e02dd1 100644
--- a/host/lib/usrp/usrp2/usrp2_impl.cpp
+++ b/host/lib/usrp/usrp2/usrp2_impl.cpp
@@ -76,16 +76,17 @@ uhd::device_addrs_t usrp2::find(const device_addr_t &hint){
     udp_transport->send(boost::asio::buffer(&ctrl_data_out, sizeof(ctrl_data_out)));
 
     //loop and recieve until the timeout
+    boost::uint8_t usrp2_ctrl_data_in_mem[1500]; //allocate MTU bytes for recv
+    usrp2_ctrl_data_t *ctrl_data_in = reinterpret_cast<usrp2_ctrl_data_t *>(usrp2_ctrl_data_in_mem);
     while(true){
-        usrp2_ctrl_data_t ctrl_data_in;
-        size_t len = udp_transport->recv(asio::buffer(&ctrl_data_in, sizeof(ctrl_data_in)));
+        size_t len = udp_transport->recv(asio::buffer(usrp2_ctrl_data_in_mem));
         //std::cout << len << "\n";
         if (len >= sizeof(usrp2_ctrl_data_t)){
             //handle the received data
-            switch(ntohl(ctrl_data_in.id)){
+            switch(ntohl(ctrl_data_in->id)){
             case USRP2_CTRL_ID_WAZZUP_DUDE:
                 //make a boost asio ipv4 with the raw addr in host byte order
-                boost::asio::ip::address_v4 ip_addr(ntohl(ctrl_data_in.data.ip_addr));
+                boost::asio::ip::address_v4 ip_addr(ntohl(ctrl_data_in->data.ip_addr));
                 device_addr_t new_addr;
                 new_addr["name"] = "USRP2";
                 new_addr["addr"] = ip_addr.to_string();