Daniel Lee / Mbed OS mbed-os-example-cellular_BG96_os511

This is an example based on mbed-os cellular APIs that demonstrates a TCP or UDP echo transaction with a public echo server. Especially, BG96 operation check based Mbed OS 5.11, tested via SK Telecom in Korea

This code could be access via Cat.M1(BG96 module) of SK telecom network in Korea. Need a WIZnet BG96 board and development board. Before using this code, must be checking your modem is authorized or not from SK telecom. This code is based on Mbed OS 5.11.5.

/media/uploads/Daniel_Lee/img_8560.jpg

Tested with

  • DISCOVERY_L485VG_IOT01A
  • K66F
  • K64F

1. Import the application into your desktop

 mbed import https://os.mbed.com/users/Daniel_Lee/code/mbed-os-example-cellular-BG96_os511/

 cd mbed-os-example-cellular-BG96_os511

2. Compile and program

mbed compile -t <toolchain> -m <TARGET_BOARD>

(supported toolchains : GCC_ARM / ARM / IAR)

3. Download binary to a target board

4. Result

mbed-os-example-cellular


Built: Jun  4 2019, 13:45:53


[MAIN], plmn: (null)
Modem power on
Establishing connection
..

Connection Established.
TCP: connected with echo.mbedcloudtesting.com server
TCP: Sent 4 Bytes to echo.mbedcloudtesting.com
...Received from echo server 4 Bytes
...

Success. Exiting

5. Patched code

If need more information such as how to test, please look at https://os.mbed.com/teams/mbed-os-examples/code/mbed-os-example-cellular/.

Diff: main.cpp

Revision:
40:c46ee5b71843
Parent:
36:6294a71c9e9e
Child:
42:cab443dff75e
--- a/main.cpp	Tue Apr 30 11:02:03 2019 +0100
+++ b/main.cpp	Mon May 06 09:02:01 2019 +0100
@@ -16,11 +16,14 @@
 
 #include "mbed.h"
 #include "common_functions.h"
+#include "CellularNonIPSocket.h"
+#include "CellularDevice.h"
 #include "UDPSocket.h"
 #include "CellularLog.h"
 
 #define UDP 0
 #define TCP 1
+#define NONIP 2
 
 // Number of retries /
 #define RETRY_COUNT 3
@@ -129,28 +132,59 @@
 }
 
 /**
- * Opens a UDP or a TCP socket with the given echo server and performs an echo
- * transaction retrieving current.
+ * Opens:
+ * - UDP or TCP socket with the given echo server and performs an echo
+ *   transaction retrieving current.
+ * - Cellular Non-IP socket for which the data delivery path is decided
+ *   by network's control plane CIoT optimisation setup, for the given APN.
  */
 nsapi_error_t test_send_recv()
 {
     nsapi_size_or_error_t retcode;
 #if MBED_CONF_APP_SOCK_TYPE == TCP
     TCPSocket sock;
-#else
+#elif MBED_CONF_APP_SOCK_TYPE == UDP
     UDPSocket sock;
+#elif MBED_CONF_APP_SOCK_TYPE == NONIP
+    CellularNonIPSocket sock;
 #endif
 
+#if MBED_CONF_APP_SOCK_TYPE == NONIP
+    retcode = sock.open((CellularContext*)iface);
+#else
     retcode = sock.open(iface);
+#endif
+
     if (retcode != NSAPI_ERROR_OK) {
 #if MBED_CONF_APP_SOCK_TYPE == TCP
         print_function("TCPSocket.open() fails, code: %d\n", retcode);
-#else
+#elif MBED_CONF_APP_SOCK_TYPE == UDP
         print_function("UDPSocket.open() fails, code: %d\n", retcode);
+#elif MBED_CONF_APP_SOCK_TYPE == NONIP
+        print_function("CellularNonIPSocket.open() fails, code: %d\n", retcode);
 #endif
         return -1;
     }
 
+    int n = 0;
+    const char *echo_string = "TEST";
+    char recv_buf[4];
+
+    sock.set_timeout(15000);
+
+#if MBED_CONF_APP_SOCK_TYPE == NONIP
+    retcode = sock.send((void*) echo_string, sizeof(echo_string));
+    if (retcode < 0) {
+        print_function("CellularNonIPSocket.send() fails, code: %d\n", retcode);
+        return -1;
+    } else {
+        print_function("CellularNonIPSocket: Sent %d Bytes\n", retcode);
+    }
+
+    n = sock.recv((void*) recv_buf, sizeof(recv_buf));
+
+#else
+
     SocketAddress sock_addr;
     retcode = iface->gethostbyname(host_name, &sock_addr);
     if (retcode != NSAPI_ERROR_OK) {
@@ -160,10 +194,6 @@
 
     sock_addr.set_port(port);
 
-    sock.set_timeout(15000);
-    int n = 0;
-    const char *echo_string = "TEST";
-    char recv_buf[4];
 #if MBED_CONF_APP_SOCK_TYPE == TCP
     retcode = sock.connect(sock_addr);
     if (retcode < 0) {
@@ -193,6 +223,7 @@
 
     n = sock.recvfrom(&sock_addr, (void*) recv_buf, sizeof(recv_buf));
 #endif
+#endif
 
     sock.close();
 
@@ -219,10 +250,17 @@
     dot_thread.start(dot_event);
 #endif // #if MBED_CONF_MBED_TRACE_ENABLE
 
-    // sim pin, apn, credentials and possible plmn are taken atuomtically from json when using get_default_instance()
-    iface = NetworkInterface::get_default_instance();
+#if MBED_CONF_APP_SOCK_TYPE == NONIP
+    iface = CellularContext::get_default_nonip_instance();
+#else
+    iface = CellularContext::get_default_instance();
+#endif
+
     MBED_ASSERT(iface);
 
+    // sim pin, apn, credentials and possible plmn are taken automatically from json when using NetworkInterface::set_default_parameters()
+    iface->set_default_parameters();
+
     nsapi_error_t retcode = NSAPI_ERROR_NO_CONNECTION;
 
     /* Attempt to connect to a cellular network */