Daniel Lee / Mbed OS mbed-os-example-cellular-le910

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

This code is forked from https://os.mbed.com/teams/mbed-os-examples/code/mbed-os-example-cellular/

This is an example showing how to use Skywire board with LE910-x module.

In this example, I had used the LE910-EUG module for 4G communication. Mbed OS code wasn't changed for LE910-x, because the Telit' HE910 is included mainline code on Mbed OS already. HE910 and LE910 are most similar. Therefore you can use LE910 via HE910 driver. Please check to configure of mbed_app.json, and initialize code for Skywire board of main.cpp.

Open mbed_app.json, you need to define a UART for the MCU to communicate with the xE910 module.

            "TELIT_HE910.tx"                 : "D1",
            "TELIT_HE910.rx"                 : "D0",
            "TELIT_HE910.provide-default"    : true

If you are using Pelion CM, make the following settings:

            "nsapi.default-cellular-apn"     : "\"stream.co.uk\"",
            "nsapi.default-cellular-username": "\"streamip\"",
            "nsapi.default-cellular-password": "\"streamip\"",

For your information, please see Pelion Connectivity Quick start guide.

320

You can find Skywire sensor shield information though NimbeLink site.

Tested with

  • DISCO_L475VG_IOT01A
  • K64F

1. Import the application into your desktop:

 mbed import https://os.mbed.com/users/Daniel_Lee/code/mbed-os-example-cellular-le910/

 cd mbed-os-example-cellular-le910

2. Compile and program:

mbed compile -t GCC_ARM -m DISCO_L475VG_IOT01A

(supported toolchains : GCC_ARM / ARM / IAR)

3. Download binary to a target board

4. Result

mbed-os-example-cellular


Built: Feb  7 2020, 07:02:27
Starting Skywire board with LE910-EUG Demo...
Waiting for Skywire to Boot...
Wait 15 seconds..
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

Diff: main.cpp

Revision:
11:23ea0907186e
Parent:
6:5678c0b6f74e
Child:
13:4bea5334b419
--- a/main.cpp	Wed Jun 06 07:45:26 2018 +0100
+++ b/main.cpp	Mon Jun 18 09:00:19 2018 +0100
@@ -17,7 +17,6 @@
 #include "mbed.h"
 #include "common_functions.h"
 #include "UDPSocket.h"
-#include "OnboardCellularInterface.h"
 #include "CellularLog.h"
 
 #define UDP 0
@@ -41,16 +40,13 @@
 // Number of retries /
 #define RETRY_COUNT 3
 
-
-
-// CellularInterface object
-OnboardCellularInterface iface;
+CellularBase *iface;
 
 // Echo server hostname
-const char *host_name = "echo.mbedcloudtesting.com";
+const char *host_name = MBED_CONF_APP_ECHO_SERVER_HOSTNAME;
 
 // Echo server port (same for TCP and UDP)
-const int port = 7;
+const int port = MBED_CONF_APP_ECHO_SERVER_PORT;
 
 static rtos::Mutex trace_mutex;
 
@@ -80,10 +76,16 @@
 
     mbed_trace_mutex_wait_function_set(trace_wait);
     mbed_trace_mutex_release_function_set(trace_release);
+
+    mbed_cellular_trace::mutex_wait_function_set(trace_wait);
+    mbed_cellular_trace::mutex_release_function_set(trace_release);
 }
 
 static void trace_close()
 {
+    mbed_cellular_trace::mutex_wait_function_set(NULL);
+    mbed_cellular_trace::mutex_release_function_set(NULL);
+
     mbed_trace_free();
 }
 #endif // #if MBED_CONF_MBED_TRACE_ENABLE
@@ -104,7 +106,7 @@
 {
     while (true) {
         Thread::wait(4000);
-        if (!iface.is_connected()) {
+        if (!iface->is_connected()) {
             trace_mutex.lock();
             printf(".");
             fflush(stdout);
@@ -123,8 +125,8 @@
     nsapi_error_t retcode = NSAPI_ERROR_OK;
     uint8_t retry_counter = 0;
 
-    while (!iface.is_connected()) {
-        retcode = iface.connect();
+    while (!iface->is_connected()) {
+        retcode = iface->connect();
         if (retcode == NSAPI_ERROR_AUTH_FAILURE) {
             print_function("\n\nAuthentication Failure. Exiting application\n");
         } else if (retcode == NSAPI_ERROR_OK) {
@@ -154,14 +156,14 @@
     UDPSocket sock;
 #endif
 
-    retcode = sock.open(&iface);
+    retcode = sock.open(iface);
     if (retcode != NSAPI_ERROR_OK) {
         print_function("UDPSocket.open() fails, code: %d\n", retcode);
         return -1;
     }
 
     SocketAddress sock_addr;
-    retcode = iface.gethostbyname(host_name, &sock_addr);
+    retcode = iface->gethostbyname(host_name, &sock_addr);
     if (retcode != NSAPI_ERROR_OK) {
         print_function("Couldn't resolve remote host: %s, code: %d\n", host_name, retcode);
         return -1;
@@ -222,14 +224,14 @@
 #else
     dot_thread.start(dot_event);
 #endif // #if MBED_CONF_MBED_TRACE_ENABLE
+    iface = CellularBase::get_default_instance();
+    MBED_ASSERT(iface);
+
     /* Set Pin code for SIM card */
-    iface.set_sim_pin(MBED_CONF_APP_SIM_PIN_CODE);
+    iface->set_sim_pin(MBED_CONF_APP_SIM_PIN_CODE);
 
     /* Set network credentials here, e.g., APN */
-    iface.set_credentials(MBED_CONF_APP_APN, MBED_CONF_APP_USERNAME, MBED_CONF_APP_PASSWORD);
-
-    /* Set the modem debug on/off */
-    iface.modem_debug_on(MBED_CONF_APP_MODEM_TRACE);
+    iface->set_credentials(MBED_CONF_APP_APN, MBED_CONF_APP_USERNAME, MBED_CONF_APP_PASSWORD);
 
     nsapi_error_t retcode = NSAPI_ERROR_NO_CONNECTION;