Move example code from the doc

CellularTCP/main.cpp

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+#include "mbed.h"
+#include "UDPSocket.h"
+#include "OnboardCellularInterface.h"
+
+// SIM pin code goes here
+#define PIN_CODE    "1234"
+
+// Network credentials like APN go here, e.g.,
+// "apn, username, password"
+#define CREDENTIALS "internet"
+
+// Number of retries /
+#define RETRY_COUNT 3
+
+// Cellular network interface object
+OnboardCellularInterface iface;
+
+// Echo server hostname
+const char *host_name = "echo.u-blox.com";
+
+// Echo server TCP port
+const int port = 7;
+
+/**
+ * Connects to the Cellular Network
+ */
+nsapi_error_t do_connect()
+{
+    nsapi_error_t retcode;
+    uint8_t retry_counter = 0;
+
+    while (!iface.is_connected()) {
+        retcode = iface.connect();
+        if (retcode == NSAPI_ERROR_AUTH_FAILURE) {
+            printf("\n\nAuthentication Failure. Exiting application\n");
+            break;
+        } else if (retcode == NSAPI_ERROR_OK) {
+            printf("\n\nConnection Established.\n");
+            break;
+        } else if (retry_counter > RETRY_COUNT) {
+            printf("\n\nFatal connection failure: %d\n", retcode);
+            break;
+        }
+
+        printf("\n\nCouldn't connect: %d, will retry\n", retcode);
+        retry_counter++;
+    }
+
+    return retcode;
+}
+
+/**
+ * Opens a TCP socket with the given echo server and undergoes an echo
+ * transaction.
+ */
+int test_send_recv()
+{
+    nsapi_size_or_error_t retcode;
+
+    TCPSocket sock;
+
+    // Prepare the connection
+    retcode = sock.open(&iface);
+    if (retcode != NSAPI_ERROR_OK) {
+        printf("TCPSocket.open() fails, code: %d\n", retcode);
+        return -1;
+    }
+
+    SocketAddress sock_addr;
+    retcode = iface.gethostbyname(host_name, &sock_addr);
+    if (retcode != NSAPI_ERROR_OK) {
+        printf("Couldn't resolve remote host: %s, code: %d\n", host_name,
+               retcode);
+        return -1;
+    }
+
+    sock_addr.set_port(port);
+
+    sock.set_timeout(15000);
+    int n = 0;
+    char *echo_string = "TEST";
+    char recv_buf[4];
+
+    // Connect
+    retcode = sock.connect(sock_addr);
+    if (retcode < 0) {
+        printf("TCPSocket.connect() fails, code: %d\n", retcode);
+        return -1;
+    } else {
+        printf("TCP: connected with %s server\n", host_name);
+    }
+
+    // Send some data
+    retcode = sock.send((void*) echo_string, sizeof(echo_string));
+    if (retcode < 0) {
+        printf("TCPSocket.send() fails, code: %d\n", retcode);
+        return -1;
+    } else {
+        printf("TCP: Sent %d Bytes to %s\n", retcode, host_name);
+    }
+
+    // Wait for the echo
+    n = sock.recv((void*) recv_buf, sizeof(recv_buf));
+
+    // Disconnect
+    sock.close();
+
+    if (n > 0) {
+        printf("Received from echo server %d Bytes\n", n);
+        return 0;
+    }
+
+    return -1;
+}
+
+int main()
+{
+    iface.modem_debug_on(MBED_CONF_APP_MODEM_TRACE);
+
+    /* Set Pin code for SIM card */
+    iface.set_sim_pin(PIN_CODE);
+
+    /* Set network credentials here, for example the APN */
+    iface.set_credentials(CREDENTIALS);
+
+    printf("\n\nmbed-os-example-cellular, Connecting...\n");
+
+    /* Attempt to connect to a cellular network */
+    if (do_connect() == NSAPI_ERROR_OK) {
+        int ret = test_send_recv();
+        if (ret == 0) {
+            printf("\n\nSuccess. Exiting \n\n");
+            return 0;
+        }
+    }
+
+    printf("\n\nFailure. Exiting \n\n");
+    return -1;
+}

CellularTCP/mbed-os.lib

@@ -0,0 +1 @@
+https://github.com/ARMmbed/mbed-os/#c53d51fe9220728bf8ed27afe7afc1ecc3f6f5d7