Example of AWS IoT connection and Web Dashboard thru STM32 Nucleo evaluation board and mbed OS.

Dependencies:   X_NUCLEO_IKS01A1 mbed FP MQTTPacket DnsQuery ATParser

Introduction

The demo is aimed to STM32 Nucleo board with WiFi and sensors expansions. The board is a "thing" for the AWS IoT service. It updates IoT service shadow with sensors data every second and checks subscription messages.

Hardware Configuration

https://github.com/Klika-Tech/nucleo-aws-iot-demo/raw/master/doc/assets/device.jpg

Software Configuration

  • Import this Project to mbed online compiler
  • Find the next part of code in main.cpp file ...

WiFi network credential

#include "mbed.h"
// WiFi network credential
#define SSID   ""  // Network must be visible otherwise it can't connect
#define PASSW  ""
#error "Wifi SSID & password empty"
  • ... And set it to your Network Name and Password. Do not forget to remove "#error" pragma line.

Information

Nucleo WiFi module is not the same as your smartphone or laptope - it is based on demo board. To avoid connection problems:

  1. Place Nucleo as close to WiFi hot spot as possible. Or...
  2. Turn on mobile hot spot in your laptop as close to the device as possible.
  3. Make sure that hot spot permits 2.4 GHz band communications
  • Setup BackEnd and store certificates using this backend setup instruction
  • Find AWS_IOT_MQTT_HOST define and change it to HTTPS point mentioned in your AWS IoT thing properties named "interact"

#define AWS_IOT_MQTT_HOST              "xxxxxxxxxx.iot.us-east-1.amazonaws.com" //Use your own host.
  • Find the certificate defines clientCRT and clientKey in main.cpp file and change it to ones provided by Amazon.

/**********************************************************************************************
***********************************************************************************************
				Device Identity Certificates: Modify for your AWS IoT Thing
***********************************************************************************************
***********************************************************************************************/

/****************************************
(somecode)-certificate.pem.crt - Amazon signed PEM sertificate.
*****************************************/

//This Client cert is example. Use own instead.
const uint8_t clientCRT[] = "\
-----BEGIN CERTIFICATE-----\n\
MIIDBjCCAe6gAwIBAgIUVph856omeIxW3UPioq+UrX1DbwowDQYJKoZIhvcNAQEL\
BQAwTTFLMEkGA1UECwxCQW1hem9uIFdlYiBTZXJ2aWNlcyBPPUFtYXpvbi5jb20g\
SW5jLiBMPVNlYXR0bGUgU1Q9V2FzaGluZ3RvbiBDPVVTMB4XDTE3MDUyNTExNTEy\
OVoXDTQ5MTIzMTIzNTk1OVowgZUxCzAJBgNVBAYTAkJZMQ4wDAYDVQQIDAVNaW5z\
azEOMAwGA1UEBwwFTWluc2sxFzAVBgNVBAoMDktsaWthLVRlY2ggTExDMRcwFQYD\
VQQLDA5LbGlrYS1UZWNoIExMQzEMMAoGA1UEAwwDUm5EMSYwJAYJKoZIhvcNAQkB\
FhdtdmF0YWxldUBrbGlrYS10ZWNoLmNvbTBZMBMGByqGSM49AgEGCCqGSM49AwEH\
A0IABCJgOQJmoTBJVPfli9Hm/JVixaxkY5rtlgrYO3hSl633A2hg0P/ue0wXDbF3\
aQ0X57IRFE4k4FEbr3UXjT/IczKjYDBeMB8GA1UdIwQYMBaAFK3YzTUPlYB2Li75\
i/z8rEogr1d6MB0GA1UdDgQWBBT18HXBaXFJuAR/0SwegnxJ+pyJ6TAMBgNVHRMB\
Af8EAjAAMA4GA1UdDwEB/wQEAwIHgDANBgkqhkiG9w0BAQsFAAOCAQEAb0Ux1aH5\
RLxjrfGqXN6rPVqh8QQRS+AyBfzmaQN8HaPZMkX5WxXLvcn0A3uWlwQxPPkcZ4zf\
51GHtFFQWB4YZ8dx8mUQ0v/j7onHjCJgZ8iDgwOyKMGtnsDZWCakQw+a6cj+NrMZ\
tzhjwCzEEP6ePcbXwErI5OOzLuWns2L/JEr2wWNkokgRuS8ewr/SQ9OLWIWa2rFM\
ahPNTb3y/qBeWdjeJmhI+TOxdqIpsF8roWP25zwo/zkzCHCjXFBrL+0CA4MpxIl9\
x02i7aAhlJ6ys80lDxdeWeeQJXRKkGknP8mcmKn3iEqqJ5s1dQePj2b5d3ldatya\
wsxQBqqZXzIWEw==\
\n\
-----END CERTIFICATE-----\n";



/**********************************************************************************************
***********************************************************************************************
						Private Key: Modify for your AWS IoT Thing
***********************************************************************************************
***********************************************************************************************/

/********************************************************************8****************************************
nucleo.key.pem - client key generated according to readme.
**************************************************************************************************************/

//This Client Key is example. Use own instead.
const uint8_t clientKey[] ="\
-----BEGIN EC PARAMETERS-----\n\
BggqhkjOPQMBBw==\
-----END EC PARAMETERS-----\n\
-----BEGIN EC PRIVATE KEY-----\n\
MHcCAQEEIHPRfWSC8/k/BsqDWKuP15dXsI9fGwpkTIsLZe6mIrAAoAoGCCqGSM49\
AwEHoUQDQgAEImA5AmahMElU9+WL0eb8lWLFrGRjmu2WCtg7eFKXrfcDaGDQ/+57\
TBcNsXdpDRfnshEUTiTgURuvdReNP8hzMg==\
-----END EC PRIVATE KEY-----\n";

Build and Check

  1. Plugin your board to USB of your PC. USB Disk Drive and USB COM Port should appear in your system.
  2. Open any Serial Console, connect it to your USB Serial Port and setup speed equal to 115200.
  3. Compile this Project and save .bin file to USB Disk Drive
  4. After board reset you should see next log in serial console:

X-NUCLEO-IDW01M1 mbed Application

connecting to AP
LOG:   int main() L#361 Connected to WiFI.
LOG:   int connect(MQTT::Client<MQTTWiFi, Countdown, 350, 5> *, MQTTWiFi *) L#186 =====================================
LOG:   int connect(MQTT::Client<MQTTWiFi, Countdown, 350, 5> *, MQTTWiFi *) L#187 Connecting WiFi.
LOG:   int connect(MQTT::Client<MQTTWiFi, Countdown, 350, 5> *, MQTTWiFi *) L#188 Nucleo IP ADDRESS: X.X.X.X
LOG:   int connect(MQTT::Client<MQTTWiFi, Countdown, 350, 5> *, MQTTWiFi *) L#189 Nucleo MAC ADDRESS: 00:11:22:33:44:55
LOG:   int connect(MQTT::Client<MQTTWiFi, Countdown, 350, 5> *, MQTTWiFi *) L#190 Server Hostname: xxxxxxxx.iot.us-east-1.amazonaws.com port: 8883
LOG:   int connect(MQTT::Client<MQTTWiFi, Countdown, 350, 5> *, MQTTWiFi *) L#191 Client ID: Nucleo
LOG:   int connect(MQTT::Client<MQTTWiFi, Countdown, 350, 5> *, MQTTWiFi *) L#194 =====================================
LOG:   int MQTTSocket::getNTPtime(int) L#58 Success receiving time from ntp server. Tick from 1 Jan 1970 is equal to 1505399292.
--->TCP Connected
--->MQTT Connected
--->>>MQTT subscribed to: Nucleo/test
Length - 245, Publishing {"state": {"reported": {"temperature": 23.690001, "humidity": 98.190002, "pressure": 982.869141, "accelerometer": [-0.009000, 0.030000, 0.971000], "gyroscope": [0.420000, -2.660000, 1.750000], "magnetometer": [-3.600000, -7.100000, 53.300000]}}}
Length - 245, Publishing {"state": {"reported": {"temperature": 23.660000, "humidity": 98.010002, "pressure": 982.770264, "accelerometer": [-0.009000, 0.030000, 0.971000], "gyroscope": [0.770000, -2.310000, 1.470000], "magnetometer": [-3.100000, -8.300000, 54.200000]}}}
Length - 245, Publishing {"state": {"reported": {"temperature": 23.670000, "humidity": 98.129997, "pressure": 982.724121, "accelerometer": [-0.008000, 0.029000, 0.971000], "gyroscope": [0.630000, -2.380000, 1.400000], "magnetometer": [-3.100000, -7.900000, 53.400000]}}}
Length - 245, Publishing {"state": {"reported": {"temperature": 23.690001, "humidity": 98.019997, "pressure": 982.840088, "accelerometer": [-0.009000, 0.030000, 0.972000], "gyroscope": [0.700000, -2.450000, 1.540000], "magnetometer": [-3.700000, -7.900000, 53.400000]}}}
Length - 245, Publishing {"state": {"reported": {"temperature": 23.709999, "humidity": 98.040001, "pressure": 982.828613, "accelerometer": [-0.009000, 0.030000, 0.971000], "gyroscope": [0.630000, -2.520000, 1.470000], "magnetometer": [-2.900000, -7.400000, 52.400000]}}}
Length - 245, Publishing {"state": {"reported": {"temperature": 23.719999, "humidity": 97.860001, "pressure": 982.917236, "accelerometer": [-0.026000, 0.103000, 0.891000], "gyroscope": [1.050000, -2.310000, 1.260000], "magnetometer": [-3.300000, -7.100000, 53.500000]}}}

Information

Device connection state might be checked by Green Led on the board. Green light means that device is connected and transferring data to cloud.

  1. Configure and start your dashboard using instruction and corresponding sources from github
  2. Use Blue button to set up markers to charts.
  3. Use AWS IoT console MQTT Client to test device subscription to "Nucleo/test". Just publish any message to this topic and serial port output.
  4. PROFIT!
Committer:
PavelSavyhin
Date:
Thu Oct 19 11:36:41 2017 +0000
Revision:
1:042ca9148926
Parent:
0:4cdaf9b1e7d0
Connection times are optimized and logging is extended.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
PavelSavyhin 0:4cdaf9b1e7d0 1 /* Socket
PavelSavyhin 0:4cdaf9b1e7d0 2 * Copyright (c) 2015 ARM Limited
PavelSavyhin 0:4cdaf9b1e7d0 3 *
PavelSavyhin 0:4cdaf9b1e7d0 4 * Licensed under the Apache License, Version 2.0 (the "License");
PavelSavyhin 0:4cdaf9b1e7d0 5 * you may not use this file except in compliance with the License.
PavelSavyhin 0:4cdaf9b1e7d0 6 * You may obtain a copy of the License at
PavelSavyhin 0:4cdaf9b1e7d0 7 *
PavelSavyhin 0:4cdaf9b1e7d0 8 * http://www.apache.org/licenses/LICENSE-2.0
PavelSavyhin 0:4cdaf9b1e7d0 9 *
PavelSavyhin 0:4cdaf9b1e7d0 10 * Unless required by applicable law or agreed to in writing, software
PavelSavyhin 0:4cdaf9b1e7d0 11 * distributed under the License is distributed on an "AS IS" BASIS,
PavelSavyhin 0:4cdaf9b1e7d0 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
PavelSavyhin 0:4cdaf9b1e7d0 13 * See the License for the specific language governing permissions and
PavelSavyhin 0:4cdaf9b1e7d0 14 * limitations under the License.
PavelSavyhin 0:4cdaf9b1e7d0 15 */
PavelSavyhin 0:4cdaf9b1e7d0 16
PavelSavyhin 0:4cdaf9b1e7d0 17 #include "Socket.h"
PavelSavyhin 0:4cdaf9b1e7d0 18
PavelSavyhin 0:4cdaf9b1e7d0 19 Socket::Socket()
PavelSavyhin 0:4cdaf9b1e7d0 20 : _iface(0)
PavelSavyhin 0:4cdaf9b1e7d0 21 , _socket(0)
PavelSavyhin 0:4cdaf9b1e7d0 22 , _timeout(-1)
PavelSavyhin 0:4cdaf9b1e7d0 23 {
PavelSavyhin 0:4cdaf9b1e7d0 24 }
PavelSavyhin 0:4cdaf9b1e7d0 25
PavelSavyhin 0:4cdaf9b1e7d0 26 Socket::~Socket()
PavelSavyhin 0:4cdaf9b1e7d0 27 {
PavelSavyhin 0:4cdaf9b1e7d0 28 if (_socket) {
PavelSavyhin 0:4cdaf9b1e7d0 29 close();
PavelSavyhin 0:4cdaf9b1e7d0 30 }
PavelSavyhin 0:4cdaf9b1e7d0 31 }
PavelSavyhin 0:4cdaf9b1e7d0 32
PavelSavyhin 0:4cdaf9b1e7d0 33 int Socket::open(NetworkStack *iface, nsapi_protocol_t proto)
PavelSavyhin 0:4cdaf9b1e7d0 34 {
PavelSavyhin 0:4cdaf9b1e7d0 35 _iface = iface;
PavelSavyhin 0:4cdaf9b1e7d0 36
PavelSavyhin 0:4cdaf9b1e7d0 37 void *socket;
PavelSavyhin 0:4cdaf9b1e7d0 38 int err = _iface->socket_open(&socket, proto);
PavelSavyhin 0:4cdaf9b1e7d0 39 if (err) {
PavelSavyhin 0:4cdaf9b1e7d0 40 return err;
PavelSavyhin 0:4cdaf9b1e7d0 41 }
PavelSavyhin 0:4cdaf9b1e7d0 42
PavelSavyhin 0:4cdaf9b1e7d0 43 _socket = socket;
PavelSavyhin 0:4cdaf9b1e7d0 44 _iface->socket_attach(_socket, &Socket::thunk, this);
PavelSavyhin 0:4cdaf9b1e7d0 45
PavelSavyhin 0:4cdaf9b1e7d0 46 return 0;
PavelSavyhin 0:4cdaf9b1e7d0 47 }
PavelSavyhin 0:4cdaf9b1e7d0 48
PavelSavyhin 0:4cdaf9b1e7d0 49 int Socket::close()
PavelSavyhin 0:4cdaf9b1e7d0 50 {
PavelSavyhin 0:4cdaf9b1e7d0 51 if (!_socket) {
PavelSavyhin 0:4cdaf9b1e7d0 52 return 0;
PavelSavyhin 0:4cdaf9b1e7d0 53 }
PavelSavyhin 0:4cdaf9b1e7d0 54
PavelSavyhin 0:4cdaf9b1e7d0 55 _iface->socket_attach(_socket, 0, 0);
PavelSavyhin 0:4cdaf9b1e7d0 56
PavelSavyhin 0:4cdaf9b1e7d0 57 void *volatile socket = _socket;
PavelSavyhin 0:4cdaf9b1e7d0 58 _socket = 0;
PavelSavyhin 0:4cdaf9b1e7d0 59 return _iface->socket_close(socket);
PavelSavyhin 0:4cdaf9b1e7d0 60 }
PavelSavyhin 0:4cdaf9b1e7d0 61
PavelSavyhin 0:4cdaf9b1e7d0 62 int Socket::bind(uint16_t port)
PavelSavyhin 0:4cdaf9b1e7d0 63 {
PavelSavyhin 0:4cdaf9b1e7d0 64 SocketAddress addr(0, port);
PavelSavyhin 0:4cdaf9b1e7d0 65 return bind(addr);
PavelSavyhin 0:4cdaf9b1e7d0 66 }
PavelSavyhin 0:4cdaf9b1e7d0 67
PavelSavyhin 0:4cdaf9b1e7d0 68 int Socket::bind(const char *address, uint16_t port)
PavelSavyhin 0:4cdaf9b1e7d0 69 {
PavelSavyhin 0:4cdaf9b1e7d0 70 SocketAddress addr(address, port);
PavelSavyhin 0:4cdaf9b1e7d0 71 return bind(addr);
PavelSavyhin 0:4cdaf9b1e7d0 72 }
PavelSavyhin 0:4cdaf9b1e7d0 73
PavelSavyhin 0:4cdaf9b1e7d0 74 int Socket::bind(const SocketAddress &address)
PavelSavyhin 0:4cdaf9b1e7d0 75 {
PavelSavyhin 0:4cdaf9b1e7d0 76 if (!_socket) {
PavelSavyhin 0:4cdaf9b1e7d0 77 return NSAPI_ERROR_NO_SOCKET;
PavelSavyhin 0:4cdaf9b1e7d0 78 }
PavelSavyhin 0:4cdaf9b1e7d0 79
PavelSavyhin 0:4cdaf9b1e7d0 80 return _iface->socket_bind(_socket, address);
PavelSavyhin 0:4cdaf9b1e7d0 81 }
PavelSavyhin 0:4cdaf9b1e7d0 82
PavelSavyhin 0:4cdaf9b1e7d0 83 void Socket::set_blocking(bool blocking)
PavelSavyhin 0:4cdaf9b1e7d0 84 {
PavelSavyhin 0:4cdaf9b1e7d0 85 set_timeout(blocking ? -1 : 0);
PavelSavyhin 0:4cdaf9b1e7d0 86 }
PavelSavyhin 0:4cdaf9b1e7d0 87
PavelSavyhin 0:4cdaf9b1e7d0 88 void Socket::set_timeout(int timeout)
PavelSavyhin 0:4cdaf9b1e7d0 89 {
PavelSavyhin 0:4cdaf9b1e7d0 90 _timeout = timeout;
PavelSavyhin 0:4cdaf9b1e7d0 91 }
PavelSavyhin 0:4cdaf9b1e7d0 92
PavelSavyhin 0:4cdaf9b1e7d0 93 int Socket::setsockopt(int level, int optname, const void *optval, unsigned optlen)
PavelSavyhin 0:4cdaf9b1e7d0 94 {
PavelSavyhin 0:4cdaf9b1e7d0 95 if (!_socket) {
PavelSavyhin 0:4cdaf9b1e7d0 96 return NSAPI_ERROR_NO_SOCKET;
PavelSavyhin 0:4cdaf9b1e7d0 97 }
PavelSavyhin 0:4cdaf9b1e7d0 98
PavelSavyhin 0:4cdaf9b1e7d0 99 return _iface->setsockopt(_socket, level, optname, optval, optlen);
PavelSavyhin 0:4cdaf9b1e7d0 100 }
PavelSavyhin 0:4cdaf9b1e7d0 101
PavelSavyhin 0:4cdaf9b1e7d0 102 int Socket::getsockopt(int level, int optname, void *optval, unsigned *optlen)
PavelSavyhin 0:4cdaf9b1e7d0 103 {
PavelSavyhin 0:4cdaf9b1e7d0 104 if (!_socket) {
PavelSavyhin 0:4cdaf9b1e7d0 105 return NSAPI_ERROR_NO_SOCKET;
PavelSavyhin 0:4cdaf9b1e7d0 106 }
PavelSavyhin 0:4cdaf9b1e7d0 107
PavelSavyhin 0:4cdaf9b1e7d0 108 return _iface->getsockopt(_socket, level, optname, optval, optlen);
PavelSavyhin 0:4cdaf9b1e7d0 109
PavelSavyhin 0:4cdaf9b1e7d0 110 }
PavelSavyhin 0:4cdaf9b1e7d0 111
PavelSavyhin 0:4cdaf9b1e7d0 112 void Socket::wakeup()
PavelSavyhin 0:4cdaf9b1e7d0 113 {
PavelSavyhin 0:4cdaf9b1e7d0 114 }
PavelSavyhin 0:4cdaf9b1e7d0 115
PavelSavyhin 0:4cdaf9b1e7d0 116 void Socket::thunk(void *data)
PavelSavyhin 0:4cdaf9b1e7d0 117 {
PavelSavyhin 0:4cdaf9b1e7d0 118 Socket *self = (Socket *)data;
PavelSavyhin 0:4cdaf9b1e7d0 119 if (self->_callback) {
PavelSavyhin 0:4cdaf9b1e7d0 120 self->_callback();
PavelSavyhin 0:4cdaf9b1e7d0 121 }
PavelSavyhin 0:4cdaf9b1e7d0 122 }
PavelSavyhin 0:4cdaf9b1e7d0 123
PavelSavyhin 0:4cdaf9b1e7d0 124 void Socket::attach(FunctionPointer callback)
PavelSavyhin 0:4cdaf9b1e7d0 125 {
PavelSavyhin 0:4cdaf9b1e7d0 126 _callback = callback;
PavelSavyhin 0:4cdaf9b1e7d0 127 }