mbed-os-example-cellular-TPB23 - This is an example based on mbed-os cellular APIs…

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Daniel Lee / Mbed OS mbed-os-example-cellular-TPB23

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

462 320 320

And also can use with mbed application shield, as shown below.

320

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

SERCOMM/TPB23/SERCOMM_TPB23_CellularStack.cpp@45:63eba30af193, 2019-08-07 (annotated)

Committer:: Daniel_Lee
Date:: Wed Aug 07 06:31:31 2019 +0000
Revision:: 45:63eba30af193

Update for Mbed OS 5.12.x; This code was tested on Mbed OS 5.12.2, please check code revision!

Who changed what in which revision?

User	Revision	Line number	New contents of line
Daniel_Lee	45:63eba30af193	1	/*
Daniel_Lee	45:63eba30af193	2	* Copyright (c) 2017, Arm Limited and affiliates.
Daniel_Lee	45:63eba30af193	3	* SPDX-License-Identifier: Apache-2.0
Daniel_Lee	45:63eba30af193	4	*
Daniel_Lee	45:63eba30af193	5	* Licensed under the Apache License, Version 2.0 (the "License");
Daniel_Lee	45:63eba30af193	6	* you may not use this file except in compliance with the License.
Daniel_Lee	45:63eba30af193	7	* You may obtain a copy of the License at
Daniel_Lee	45:63eba30af193	8	*
Daniel_Lee	45:63eba30af193	9	* http://www.apache.org/licenses/LICENSE-2.0
Daniel_Lee	45:63eba30af193	10	*
Daniel_Lee	45:63eba30af193	11	* Unless required by applicable law or agreed to in writing, software
Daniel_Lee	45:63eba30af193	12	* distributed under the License is distributed on an "AS IS" BASIS,
Daniel_Lee	45:63eba30af193	13	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
Daniel_Lee	45:63eba30af193	14	* See the License for the specific language governing permissions and
Daniel_Lee	45:63eba30af193	15	* limitations under the License.
Daniel_Lee	45:63eba30af193	16	*/
Daniel_Lee	45:63eba30af193	17
Daniel_Lee	45:63eba30af193	18	#include "SERCOMM_TPB23_CellularStack.h"
Daniel_Lee	45:63eba30af193	19	#include "CellularUtil.h"
Daniel_Lee	45:63eba30af193	20	#include "CellularLog.h"
Daniel_Lee	45:63eba30af193	21
Daniel_Lee	45:63eba30af193	22	#define PACKET_SIZE_MAX 1500 //TPB23 Range is 12-1500
Daniel_Lee	45:63eba30af193	23
Daniel_Lee	45:63eba30af193	24	using namespace mbed;
Daniel_Lee	45:63eba30af193	25	using namespace mbed_cellular_util;
Daniel_Lee	45:63eba30af193	26
Daniel_Lee	45:63eba30af193	27	SERCOMM_TPB23_CellularStack::SERCOMM_TPB23_CellularStack(ATHandler &atHandler, int cid, nsapi_ip_stack_t stack_type) : AT_CellularStack(atHandler, cid, stack_type)
Daniel_Lee	45:63eba30af193	28	{
Daniel_Lee	45:63eba30af193	29	_at.set_urc_handler("+NSONMI:", mbed::Callback<void()>(this, &SERCOMM_TPB23_CellularStack::urc_nsonmi));
Daniel_Lee	45:63eba30af193	30	}
Daniel_Lee	45:63eba30af193	31
Daniel_Lee	45:63eba30af193	32	SERCOMM_TPB23_CellularStack::~SERCOMM_TPB23_CellularStack()
Daniel_Lee	45:63eba30af193	33	{
Daniel_Lee	45:63eba30af193	34	}
Daniel_Lee	45:63eba30af193	35
Daniel_Lee	45:63eba30af193	36	nsapi_error_t SERCOMM_TPB23_CellularStack::socket_listen(nsapi_socket_t handle, int backlog)
Daniel_Lee	45:63eba30af193	37	{
Daniel_Lee	45:63eba30af193	38	return NSAPI_ERROR_UNSUPPORTED;
Daniel_Lee	45:63eba30af193	39	}
Daniel_Lee	45:63eba30af193	40
Daniel_Lee	45:63eba30af193	41	nsapi_error_t SERCOMM_TPB23_CellularStack::socket_accept(void server, void socket, SocketAddress addr)
Daniel_Lee	45:63eba30af193	42	{
Daniel_Lee	45:63eba30af193	43	return NSAPI_ERROR_UNSUPPORTED;
Daniel_Lee	45:63eba30af193	44	}
Daniel_Lee	45:63eba30af193	45
Daniel_Lee	45:63eba30af193	46	nsapi_error_t SERCOMM_TPB23_CellularStack::socket_connect(nsapi_socket_t handle, const SocketAddress &address)
Daniel_Lee	45:63eba30af193	47	{
Daniel_Lee	45:63eba30af193	48	CellularSocket socket = (CellularSocket )handle;
Daniel_Lee	45:63eba30af193	49
Daniel_Lee	45:63eba30af193	50	_at.lock();
Daniel_Lee	45:63eba30af193	51	if (!socket->created) {
Daniel_Lee	45:63eba30af193	52	const nsapi_error_t error_create = create_socket_impl(socket);
Daniel_Lee	45:63eba30af193	53	if (error_create != NSAPI_ERROR_OK) {
Daniel_Lee	45:63eba30af193	54	return error_create;
Daniel_Lee	45:63eba30af193	55	}
Daniel_Lee	45:63eba30af193	56	}
Daniel_Lee	45:63eba30af193	57
Daniel_Lee	45:63eba30af193	58	_at.cmd_start("AT+NSOCO=");
Daniel_Lee	45:63eba30af193	59	_at.write_int(socket->id);
Daniel_Lee	45:63eba30af193	60	_at.write_string(address.get_ip_address(), false);
Daniel_Lee	45:63eba30af193	61	_at.write_int(address.get_port());
Daniel_Lee	45:63eba30af193	62	_at.cmd_stop();
Daniel_Lee	45:63eba30af193	63	_at.resp_start();
Daniel_Lee	45:63eba30af193	64	_at.resp_stop();
Daniel_Lee	45:63eba30af193	65	_at.unlock();
Daniel_Lee	45:63eba30af193	66
Daniel_Lee	45:63eba30af193	67	if (_at.get_last_error() == NSAPI_ERROR_OK) {
Daniel_Lee	45:63eba30af193	68	socket->remoteAddress = address;
Daniel_Lee	45:63eba30af193	69	socket->connected = true;
Daniel_Lee	45:63eba30af193	70	return NSAPI_ERROR_OK;
Daniel_Lee	45:63eba30af193	71	}
Daniel_Lee	45:63eba30af193	72
Daniel_Lee	45:63eba30af193	73	return NSAPI_ERROR_NO_CONNECTION;
Daniel_Lee	45:63eba30af193	74	}
Daniel_Lee	45:63eba30af193	75
Daniel_Lee	45:63eba30af193	76	void SERCOMM_TPB23_CellularStack::urc_nsonmi()
Daniel_Lee	45:63eba30af193	77	{
Daniel_Lee	45:63eba30af193	78	int sock_id = _at.read_int();
Daniel_Lee	45:63eba30af193	79
Daniel_Lee	45:63eba30af193	80	for (int i = 0; i < get_max_socket_count(); i++) {
Daniel_Lee	45:63eba30af193	81	CellularSocket *sock = _socket[i];
Daniel_Lee	45:63eba30af193	82	if (sock && sock->id == sock_id) {
Daniel_Lee	45:63eba30af193	83	if (sock->_cb) {
Daniel_Lee	45:63eba30af193	84	sock->_cb(sock->_data);
Daniel_Lee	45:63eba30af193	85	}
Daniel_Lee	45:63eba30af193	86	break;
Daniel_Lee	45:63eba30af193	87	}
Daniel_Lee	45:63eba30af193	88	}
Daniel_Lee	45:63eba30af193	89	}
Daniel_Lee	45:63eba30af193	90
Daniel_Lee	45:63eba30af193	91	int SERCOMM_TPB23_CellularStack::get_max_socket_count()
Daniel_Lee	45:63eba30af193	92	{
Daniel_Lee	45:63eba30af193	93	return TPB23_SOCKET_MAX;
Daniel_Lee	45:63eba30af193	94	}
Daniel_Lee	45:63eba30af193	95
Daniel_Lee	45:63eba30af193	96	bool SERCOMM_TPB23_CellularStack::is_protocol_supported(nsapi_protocol_t protocol)
Daniel_Lee	45:63eba30af193	97	{
Daniel_Lee	45:63eba30af193	98	return (protocol == NSAPI_UDP \|\| protocol == NSAPI_TCP);
Daniel_Lee	45:63eba30af193	99	}
Daniel_Lee	45:63eba30af193	100
Daniel_Lee	45:63eba30af193	101	nsapi_error_t SERCOMM_TPB23_CellularStack::socket_close_impl(int sock_id)
Daniel_Lee	45:63eba30af193	102	{
Daniel_Lee	45:63eba30af193	103	_at.cmd_start("AT+NSOCL=");
Daniel_Lee	45:63eba30af193	104	_at.write_int(sock_id);
Daniel_Lee	45:63eba30af193	105	_at.cmd_stop_read_resp();
Daniel_Lee	45:63eba30af193	106
Daniel_Lee	45:63eba30af193	107	tr_info("Close socket: %d error: %d", sock_id, _at.get_last_error());
Daniel_Lee	45:63eba30af193	108
Daniel_Lee	45:63eba30af193	109	return _at.get_last_error();
Daniel_Lee	45:63eba30af193	110	}
Daniel_Lee	45:63eba30af193	111
Daniel_Lee	45:63eba30af193	112	nsapi_error_t SERCOMM_TPB23_CellularStack::create_socket_impl(CellularSocket *socket)
Daniel_Lee	45:63eba30af193	113	{
Daniel_Lee	45:63eba30af193	114	int sock_id = -1;
Daniel_Lee	45:63eba30af193	115	bool socketOpenWorking = false;
Daniel_Lee	45:63eba30af193	116
Daniel_Lee	45:63eba30af193	117	if (socket->proto == NSAPI_UDP) {
Daniel_Lee	45:63eba30af193	118	_at.cmd_start("AT+NSOCR=DGRAM,17,");
Daniel_Lee	45:63eba30af193	119	} else if (socket->proto == NSAPI_TCP) {
Daniel_Lee	45:63eba30af193	120	_at.cmd_start("AT+NSOCR=STREAM,6,");
Daniel_Lee	45:63eba30af193	121	} else {
Daniel_Lee	45:63eba30af193	122	return NSAPI_ERROR_PARAMETER;
Daniel_Lee	45:63eba30af193	123	}
Daniel_Lee	45:63eba30af193	124	_at.write_int(socket->localAddress.get_port());
Daniel_Lee	45:63eba30af193	125	_at.write_int(1);
Daniel_Lee	45:63eba30af193	126	_at.cmd_stop();
Daniel_Lee	45:63eba30af193	127	_at.resp_start();
Daniel_Lee	45:63eba30af193	128	sock_id = _at.read_int();
Daniel_Lee	45:63eba30af193	129	_at.resp_stop();
Daniel_Lee	45:63eba30af193	130
Daniel_Lee	45:63eba30af193	131	socketOpenWorking = (_at.get_last_error() == NSAPI_ERROR_OK);
Daniel_Lee	45:63eba30af193	132
Daniel_Lee	45:63eba30af193	133	if (!socketOpenWorking) {
Daniel_Lee	45:63eba30af193	134	_at.cmd_start("AT+NSOCL=0");
Daniel_Lee	45:63eba30af193	135	_at.cmd_stop_read_resp();
Daniel_Lee	45:63eba30af193	136
Daniel_Lee	45:63eba30af193	137	if (socket->proto == NSAPI_UDP) {
Daniel_Lee	45:63eba30af193	138	_at.cmd_start("AT+NSOCR=DGRAM,17,");
Daniel_Lee	45:63eba30af193	139	} else if (socket->proto == NSAPI_TCP) {
Daniel_Lee	45:63eba30af193	140	_at.cmd_start("AT+NSOCR=STREAM,6,");
Daniel_Lee	45:63eba30af193	141	}
Daniel_Lee	45:63eba30af193	142	_at.write_int(socket->localAddress.get_port());
Daniel_Lee	45:63eba30af193	143	_at.write_int(1);
Daniel_Lee	45:63eba30af193	144	_at.cmd_stop();
Daniel_Lee	45:63eba30af193	145	_at.resp_start();
Daniel_Lee	45:63eba30af193	146	sock_id = _at.read_int();
Daniel_Lee	45:63eba30af193	147	_at.resp_stop();
Daniel_Lee	45:63eba30af193	148
Daniel_Lee	45:63eba30af193	149	socketOpenWorking = (_at.get_last_error() == NSAPI_ERROR_OK);
Daniel_Lee	45:63eba30af193	150	}
Daniel_Lee	45:63eba30af193	151
Daniel_Lee	45:63eba30af193	152	if (!socketOpenWorking \|\| (sock_id == -1)) {
Daniel_Lee	45:63eba30af193	153	tr_error("Socket create failed!");
Daniel_Lee	45:63eba30af193	154	return NSAPI_ERROR_NO_SOCKET;
Daniel_Lee	45:63eba30af193	155	}
Daniel_Lee	45:63eba30af193	156
Daniel_Lee	45:63eba30af193	157	// Check for duplicate socket id delivered by modem
Daniel_Lee	45:63eba30af193	158	for (int i = 0; i < TPB23_SOCKET_MAX; i++) {
Daniel_Lee	45:63eba30af193	159	CellularSocket *sock = _socket[i];
Daniel_Lee	45:63eba30af193	160	if (sock && sock->created && sock->id == sock_id) {
Daniel_Lee	45:63eba30af193	161	tr_error("Duplicate socket index: %d created:%d, sock_id: %d", i, sock->created, sock_id);
Daniel_Lee	45:63eba30af193	162	return NSAPI_ERROR_NO_SOCKET;
Daniel_Lee	45:63eba30af193	163	}
Daniel_Lee	45:63eba30af193	164	}
Daniel_Lee	45:63eba30af193	165
Daniel_Lee	45:63eba30af193	166	tr_info("Socket create id: %d", sock_id);
Daniel_Lee	45:63eba30af193	167
Daniel_Lee	45:63eba30af193	168	socket->id = sock_id;
Daniel_Lee	45:63eba30af193	169	socket->created = true;
Daniel_Lee	45:63eba30af193	170
Daniel_Lee	45:63eba30af193	171	return NSAPI_ERROR_OK;
Daniel_Lee	45:63eba30af193	172	}
Daniel_Lee	45:63eba30af193	173
Daniel_Lee	45:63eba30af193	174	nsapi_size_or_error_t SERCOMM_TPB23_CellularStack::socket_sendto_impl(CellularSocket *socket, const SocketAddress &address,
Daniel_Lee	45:63eba30af193	175	const void *data, nsapi_size_t size)
Daniel_Lee	45:63eba30af193	176	{
Daniel_Lee	45:63eba30af193	177	int sent_len = 0;
Daniel_Lee	45:63eba30af193	178
Daniel_Lee	45:63eba30af193	179	if (size > PACKET_SIZE_MAX) {
Daniel_Lee	45:63eba30af193	180	return NSAPI_ERROR_PARAMETER;
Daniel_Lee	45:63eba30af193	181	}
Daniel_Lee	45:63eba30af193	182
Daniel_Lee	45:63eba30af193	183	char hexstr = new char[size 2 + 1];
Daniel_Lee	45:63eba30af193	184	int hexlen = char_str_to_hex_str((const char *)data, size, hexstr);
Daniel_Lee	45:63eba30af193	185	// NULL terminated for write_string
Daniel_Lee	45:63eba30af193	186	hexstr[hexlen] = 0;
Daniel_Lee	45:63eba30af193	187
Daniel_Lee	45:63eba30af193	188	if (socket->proto == NSAPI_UDP) {
Daniel_Lee	45:63eba30af193	189	_at.cmd_start("AT+NSOST=");
Daniel_Lee	45:63eba30af193	190	_at.write_int(socket->id);
Daniel_Lee	45:63eba30af193	191	_at.write_string(address.get_ip_address(), false);
Daniel_Lee	45:63eba30af193	192	_at.write_int(address.get_port());
Daniel_Lee	45:63eba30af193	193	_at.write_int(size);
Daniel_Lee	45:63eba30af193	194	} else if (socket->proto == NSAPI_TCP) {
Daniel_Lee	45:63eba30af193	195	_at.cmd_start("AT+NSOSD=");
Daniel_Lee	45:63eba30af193	196	_at.write_int(socket->id);
Daniel_Lee	45:63eba30af193	197	_at.write_int(size);
Daniel_Lee	45:63eba30af193	198	} else {
Daniel_Lee	45:63eba30af193	199	delete [] hexstr;
Daniel_Lee	45:63eba30af193	200	return NSAPI_ERROR_PARAMETER;
Daniel_Lee	45:63eba30af193	201	}
Daniel_Lee	45:63eba30af193	202
Daniel_Lee	45:63eba30af193	203	_at.write_string(hexstr, false);
Daniel_Lee	45:63eba30af193	204	_at.cmd_stop();
Daniel_Lee	45:63eba30af193	205	_at.resp_start();
Daniel_Lee	45:63eba30af193	206	// skip socket id
Daniel_Lee	45:63eba30af193	207	_at.skip_param();
Daniel_Lee	45:63eba30af193	208	sent_len = _at.read_int();
Daniel_Lee	45:63eba30af193	209	_at.resp_stop();
Daniel_Lee	45:63eba30af193	210
Daniel_Lee	45:63eba30af193	211	delete [] hexstr;
Daniel_Lee	45:63eba30af193	212
Daniel_Lee	45:63eba30af193	213	if (_at.get_last_error() == NSAPI_ERROR_OK) {
Daniel_Lee	45:63eba30af193	214	return sent_len;
Daniel_Lee	45:63eba30af193	215	}
Daniel_Lee	45:63eba30af193	216
Daniel_Lee	45:63eba30af193	217	return _at.get_last_error();
Daniel_Lee	45:63eba30af193	218	}
Daniel_Lee	45:63eba30af193	219
Daniel_Lee	45:63eba30af193	220	nsapi_size_or_error_t SERCOMM_TPB23_CellularStack::socket_recvfrom_impl(CellularSocket socket, SocketAddress address,
Daniel_Lee	45:63eba30af193	221	void *buffer, nsapi_size_t size)
Daniel_Lee	45:63eba30af193	222	{
Daniel_Lee	45:63eba30af193	223	nsapi_size_or_error_t recv_len = 0;
Daniel_Lee	45:63eba30af193	224	int port;
Daniel_Lee	45:63eba30af193	225	char ip_address[NSAPI_IP_SIZE];
Daniel_Lee	45:63eba30af193	226
Daniel_Lee	45:63eba30af193	227	_at.cmd_start("AT+NSORF=");
Daniel_Lee	45:63eba30af193	228	_at.write_int(socket->id);
Daniel_Lee	45:63eba30af193	229	_at.write_int(size <= PACKET_SIZE_MAX ? size : PACKET_SIZE_MAX);
Daniel_Lee	45:63eba30af193	230	_at.cmd_stop();
Daniel_Lee	45:63eba30af193	231	_at.resp_start();
Daniel_Lee	45:63eba30af193	232	// receiving socket id
Daniel_Lee	45:63eba30af193	233	_at.skip_param();
Daniel_Lee	45:63eba30af193	234	_at.read_string(ip_address, sizeof(ip_address));
Daniel_Lee	45:63eba30af193	235	port = _at.read_int();
Daniel_Lee	45:63eba30af193	236	recv_len = _at.read_int();
Daniel_Lee	45:63eba30af193	237	int hexlen = _at.read_hex_string((char *)buffer, size);
Daniel_Lee	45:63eba30af193	238	// remaining length
Daniel_Lee	45:63eba30af193	239	_at.skip_param();
Daniel_Lee	45:63eba30af193	240	_at.resp_stop();
Daniel_Lee	45:63eba30af193	241
Daniel_Lee	45:63eba30af193	242	if (!recv_len \|\| (recv_len == -1) \|\| (_at.get_last_error() != NSAPI_ERROR_OK)) {
Daniel_Lee	45:63eba30af193	243	return NSAPI_ERROR_WOULD_BLOCK;
Daniel_Lee	45:63eba30af193	244	}
Daniel_Lee	45:63eba30af193	245
Daniel_Lee	45:63eba30af193	246	if (address) {
Daniel_Lee	45:63eba30af193	247	address->set_ip_address(ip_address);
Daniel_Lee	45:63eba30af193	248	address->set_port(port);
Daniel_Lee	45:63eba30af193	249	}
Daniel_Lee	45:63eba30af193	250
Daniel_Lee	45:63eba30af193	251	if (recv_len != hexlen) {
Daniel_Lee	45:63eba30af193	252	tr_error("Not received as much data as expected. Should receive: %d bytes, received: %d bytes", recv_len, hexlen);
Daniel_Lee	45:63eba30af193	253	}
Daniel_Lee	45:63eba30af193	254	return recv_len;
Daniel_Lee	45:63eba30af193	255	}

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Type:	Program
Mbed OS support:	Mbed OS
Created:	07 Aug 2019
Imports:	34
Forks:	0
Commits:	48
Dependents:	0
Dependencies:	0
Followers:	1

SERCOMM/TPB23/SERCOMM_TPB23_CellularStack.cpp@45:63eba30af193, 2019-08-07 (annotated)

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