This is an example based on mbed-os cellular APIs that demonstrates a TCP or UDP echo transaction with a public echo server.

Revision:
6:5678c0b6f74e
Parent:
0:4611f6cf2413
Child:
11:23ea0907186e
--- a/mbed_app.json	Wed Apr 11 06:30:27 2018 +0100
+++ b/mbed_app.json	Thu May 10 05:17:02 2018 +0100
@@ -20,18 +20,25 @@
         "password": {
             "help": "The password string to use for this APN, set to 0 if none",
             "value": 0
+        },
+        "trace-level": {
+            "help": "Options are TRACE_LEVEL_ERROR,TRACE_LEVEL_WARN,TRACE_LEVEL_INFO,TRACE_LEVEL_DEBUG",
+            "macro_name": "MBED_TRACE_MAX_LEVEL",
+            "value": "TRACE_LEVEL_INFO"
         }
-	},
+  },
     "target_overrides": {
         "*": {
             "target.features_add": ["LWIP", "COMMON_PAL"],
+            "mbed-trace.enable": false,
             "lwip.ipv4-enabled": true,
             "lwip.ethernet-enabled": false,
             "lwip.ppp-enabled": true,
             "lwip.tcp-enabled": true,
             "platform.stdio-convert-newlines": true,
             "platform.stdio-baud-rate": 115200,
-            "platform.default-serial-baud-rate": 115200
+            "platform.default-serial-baud-rate": 115200,
+            "platform.stdio-buffered-serial": true
         }
     }
 }