This is an example based on mbed-os cellular APIs that demonstrates a TCP or UDP echo transaction with a public echo server. Included TPB23 NB-IoT module which is can use LGU+ in Korea.
This example is showing how to use the NB-IoT(SECOM TPB23 module) of LGU plus network in Korea. The NB-IoT module' seller provided a document on how to start based on Mbed OS 5.11. (Created by CodeZoo) This guide has been supported to the latest os version which included 5.12 ~ 5.15.
- if you need specific version of Mbed OS, please revision of TPB23_Driver and check it out.
- Pelion ready example code is here!
Requirement
- Need to check CodeZoo's s hardware a guide.
- Need a CodeZoo's NBIoT board and development board.
- Board picture & Jumper configure
- And also can use with mbed application shield, as shown below.
Tested with
- DISCO_L475VG_IOT01A - If you are in Korea, can buy here !
- NUCLEO_F429ZI - If you are in Korea, can buy here !
1. Import the application into your desktop
mbed import http://os.mbed.com/users/Daniel_Lee/code/mbed-os-example-cellular-TPB23/ cd mbed-os-example-cellular-TPB23
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: Aug 7 2019, 06:10:47 [MAIN], plmn: NULL Establishing connection [00000001ms][INFO][CELL]: New CellularContext (20000a08) [00000002ms][INFO][CELL]: CellularContext plmn NULL [00000003ms][INFO][CELL]: CellularContext connect [00000036ms][INFO][CELL]: RSSI -69 dBm [00000036ms][INFO][CELL]: Start connecting (timeout 1 s) [00000087ms][INFO][CELL]: RSSI -69 dBm [00000116ms][INFO][CELL]: Modem ready [00000146ms][INFO][CELL]: RSSI -69 dBm [00000146ms][INFO][CELL]: Setup SIM (timeout 1 s) [00001233ms][INFO][CELL]: Looked up APN internet [00001362ms][ERR ][CELL]: AT error code 50 [00001362ms][WARN][CELL]: Packet domain event reporting set failed! [00001393ms][INFO][CELL]: RSSI -65 dBm [00001393ms][INFO][CELL]: Network registration (timeout 180 s) [00001443ms][INFO][CELL]: Registering network => Attaching network [00001473ms][INFO][CELL]: RSSI -65 dBm [00001473ms][INFO][CELL]: Attaching network (timeout 60 s) [00001601ms][INFO][CELL]: Found PDP context 1 [00001649ms][INFO][CELL]: Activate PDP context 1 Connection Established. [00001671ms][INFO][CELL]: Socket 0 open [00001707ms][INFO][CELL]: Socket 1 open [00001748ms][INFO][CELL]: Socket create id: 1 [00001883ms][INFO][CELL]: Socket 1 sent 43 bytes to 8.8.8.8 port 53 [00004311ms][INFO][CELL]: Socket 1 recv 59 bytes from 8.8.8.8 port 53 [00004331ms][INFO][CELL]: Close socket: 1 error: 0 [00004331ms][INFO][CELL]: Socket 1 closed [00004373ms][INFO][CELL]: Socket create id: 1 TCP: connected with echo.mbedcloudtesting.com server [00004448ms][INFO][CELL]: Socket 0 sent 4 bytes to 52.215.34.155 port 7 TCP: Sent 4 Bytes to echo.mbedcloudtesting.com [00007560ms][INFO][CELL]: Socket 0 recv 4 bytes [00007580ms][INFO][CELL]: Close socket: 1 error: 0 [00007580ms][INFO][CELL]: Socket 0 closed Received from echo server 4 Bytes [00007581ms][INFO][CELL]: CellularContext disconnect() [00007630ms][INFO][CELL]: cb: CellularContext disconnected Success. Exiting
Diff: main.cpp
- Revision:
- 0:4611f6cf2413
- Child:
- 2:0f644d6045cf
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/main.cpp Thu Mar 08 17:31:37 2018 +0000 @@ -0,0 +1,223 @@ +/* + * Copyright (c) 2017 ARM Limited. All rights reserved. + * SPDX-License-Identifier: Apache-2.0 + * Licensed under the Apache License, Version 2.0 (the License); you may + * not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an AS IS BASIS, WITHOUT + * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#include "mbed.h" +#include "common_functions.h" +#include "UDPSocket.h" +#include "OnboardCellularInterface.h" + +#define UDP 0 +#define TCP 1 + +// SIM pin code goes here +#ifndef MBED_CONF_APP_SIM_PIN_CODE +# define MBED_CONF_APP_SIM_PIN_CODE "1234" +#endif + +#ifndef MBED_CONF_APP_APN +# define MBED_CONF_APP_APN "internet" +#endif +#ifndef MBED_CONF_APP_USERNAME +# define MBED_CONF_APP_USERNAME NULL +#endif +#ifndef MBED_CONF_APP_PASSWORD +# define MBED_CONF_APP_PASSWORD NULL +#endif + +// Number of retries / +#define RETRY_COUNT 3 + + + +// CellularInterface object +OnboardCellularInterface iface; + +// Echo server hostname +const char *host_name = "echo.u-blox.com"; + +// Echo server port (same for TCP and UDP) +const int port = 7; + +Mutex PrintMutex; +Thread dot_thread; + +#define PRINT_TEXT_LENGTH 128 +char print_text[PRINT_TEXT_LENGTH]; +void print_function(const char *input_string) +{ + PrintMutex.lock(); + printf("%s", input_string); + fflush(NULL); + PrintMutex.unlock(); +} + +void dot_event() +{ + + while (true) { + wait(4); + if (!iface.is_connected()) { + print_function("."); + } else { + break; + } + } + +} + + +/** + * 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) { + print_function("\n\nAuthentication Failure. Exiting application\n"); + return retcode; + } else if (retcode != NSAPI_ERROR_OK) { + snprintf(print_text, PRINT_TEXT_LENGTH, "\n\nCouldn't connect: %d, will retry\n", retcode); + print_function(print_text); + retry_counter++; + continue; + } else if (retcode != NSAPI_ERROR_OK && retry_counter > RETRY_COUNT) { + snprintf(print_text, PRINT_TEXT_LENGTH, "\n\nFatal connection failure: %d\n", retcode); + print_function(print_text); + return retcode; + } + + break; + } + + print_function("\n\nConnection Established.\n"); + + return NSAPI_ERROR_OK; +} + +/** + * Opens a UDP or a TCP socket with the given echo server and performs an echo + * transaction retrieving current. + */ +nsapi_error_t test_send_recv() +{ + nsapi_size_or_error_t retcode; +#if MBED_CONF_APP_SOCK_TYPE == TCP + TCPSocket sock; +#else + UDPSocket sock; +#endif + + retcode = sock.open(&iface); + if (retcode != NSAPI_ERROR_OK) { + snprintf(print_text, PRINT_TEXT_LENGTH, "UDPSocket.open() fails, code: %d\n", retcode); + print_function(print_text); + return -1; + } + + SocketAddress sock_addr; + retcode = iface.gethostbyname(host_name, &sock_addr); + if (retcode != NSAPI_ERROR_OK) { + snprintf(print_text, PRINT_TEXT_LENGTH, "Couldn't resolve remote host: %s, code: %d\n", host_name, + retcode); + print_function(print_text); + return -1; + } + + 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) { + snprintf(print_text, PRINT_TEXT_LENGTH, "TCPSocket.connect() fails, code: %d\n", retcode); + print_function(print_text); + return -1; + } else { + snprintf(print_text, PRINT_TEXT_LENGTH, "TCP: connected with %s server\n", host_name); + print_function(print_text); + } + retcode = sock.send((void*) echo_string, sizeof(echo_string)); + if (retcode < 0) { + snprintf(print_text, PRINT_TEXT_LENGTH, "TCPSocket.send() fails, code: %d\n", retcode); + print_function(print_text); + return -1; + } else { + snprintf(print_text, PRINT_TEXT_LENGTH, "TCP: Sent %d Bytes to %s\n", retcode, host_name); + print_function(print_text); + } + + n = sock.recv((void*) recv_buf, sizeof(recv_buf)); +#else + + retcode = sock.sendto(sock_addr, (void*) echo_string, sizeof(echo_string)); + if (retcode < 0) { + snprintf(print_text, PRINT_TEXT_LENGTH, "UDPSocket.sendto() fails, code: %d\n", retcode); + print_function(print_text); + return -1; + } else { + snprintf(print_text, PRINT_TEXT_LENGTH, "UDP: Sent %d Bytes to %s\n", retcode, host_name); + print_function(print_text); + } + + n = sock.recvfrom(&sock_addr, (void*) recv_buf, sizeof(recv_buf)); +#endif + + sock.close(); + + if (n > 0) { + snprintf(print_text, PRINT_TEXT_LENGTH, "Received from echo server %d Bytes\n", n); + print_function(print_text); + 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(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); + + print_function("\n\nmbed-os-example-cellular\n"); + print_function("Establishing connection "); + dot_thread.start(dot_event); + + /* Attempt to connect to a cellular network */ + if (do_connect() == NSAPI_ERROR_OK) { + nsapi_error_t retcode = test_send_recv(); + if (retcode == NSAPI_ERROR_OK) { + print_function("\n\nSuccess. Exiting \n\n"); + return 0; + } + } + + print_function("\n\nFailure. Exiting \n\n"); + return -1; +} +// EOF