Fix for the fault exception issue:

tz-arm · tz-arm · commit d3d1e0d30b4d · 2018-12-10T11:07:13.000+08:00
ARMmbed/mbed-os-example-cellular#112
diff --git a/features/cellular/framework/AT/AT_CellularStack.cpp b/features/cellular/framework/AT/AT_CellularStack.cpp
@@ -307,12 +307,7 @@ nsapi_size_or_error_t AT_CellularStack::socket_recvfrom(nsapi_socket_t handle, S
 
         _at.unlock();
         if (ret_val != NSAPI_ERROR_OK) {
-            if(addr){
-                tr_error("Socket %d create %s error %d", find_socket_index(socket), addr->get_ip_address(), ret_val);
-            }
-            else{
-                tr_error("Socket %d create error %d", find_socket_index(socket), ret_val);
-            }
+            tr_error("Socket %d create error %d", find_socket_index(socket), ret_val);
             return ret_val;
         }
     }

Original file line number	Diff line number	Diff line change
`@@ -307,12 +307,7 @@ nsapi_size_or_error_t AT_CellularStack::socket_recvfrom(nsapi_socket_t handle, S`
`307`	`307`
`308`	`308`	`_at.unlock();`
`309`	`309`	`if (ret_val != NSAPI_ERROR_OK) {`
`310`		`- if(addr){`
`311`		`- tr_error("Socket %d create %s error %d", find_socket_index(socket), addr->get_ip_address(), ret_val);`
`312`		`- }`
`313`		`- else{`
`314`		`- tr_error("Socket %d create error %d", find_socket_index(socket), ret_val);`
`315`		`- }`
	`310`	`+ tr_error("Socket %d create error %d", find_socket_index(socket), ret_val);`
`316`	`311`	`return ret_val;`
`317`	`312`	`}`
`318`	`313`	`}`