Damien Frost / Mbed 2 deprecated IoT_Ex

Example program to create IoT devices for a local network, which connect to a local server.

Dependencies:   WebSocketClient WiflyInterface mbed messages

This code is used in the second part of my Internet of Things (IoT) blog post available here. The code is fairly simple, but its real value is in its reliability. I have worked hard to try to make the wireless connection as reliable, and as fast, as possible. There are a few lines of code that must be modified before it will work correctly, and those are described in the following Wiki pages.

It is designed to work with a Python WebSocket Server running on a PC, the source code of which is available here.

Once operating with the server, each microcontroller, or IoT device, will broadcast a counter and its internal temperature to your WebSocket Server.

main.cpp@2:7abdaa5a9209, 2016-10-04 (annotated)

Committer:
defrost
Date:
Tue Oct 04 13:59:13 2016 +0000
Revision:
2:7abdaa5a9209
Parent:
1:4403f2ed1c1f
Child:
3:f20e114eb2ee
- Internal temperature sensing works

Who changed what in which revision?

UserRevisionLine numberNew contents of line
defrost 0:c5607b31fb07 1 #include "mbed.h"
defrost 1:4403f2ed1c1f 2 #include "globals.h"
defrost 0:c5607b31fb07 3 #include "WiflyInterface.h"
defrost 1:4403f2ed1c1f 4 #include "Commands.h"
defrost 0:c5607b31fb07 5 #include "Websocket.h"
defrost 1:4403f2ed1c1f 6 #include "ADC.h"
defrost 0:c5607b31fb07 7
defrost 2:7abdaa5a9209 8 //#define DEBUG
defrost 0:c5607b31fb07 9 #define INFOMESSAGES
defrost 0:c5607b31fb07 10 #define WARNMESSAGES
defrost 0:c5607b31fb07 11 #define ERRMESSAGES
defrost 0:c5607b31fb07 12 #define FUNCNAME "IoT"
defrost 0:c5607b31fb07 13 #include "messages.h"
defrost 0:c5607b31fb07 14
defrost 0:c5607b31fb07 15 // Main Loop!
defrost 0:c5607b31fb07 16 int main() {
defrost 0:c5607b31fb07 17 unsigned int wifi_cmd = NO_WIFI_CMD;
defrost 0:c5607b31fb07 18 float wifi_data = 0.0f;
defrost 0:c5607b31fb07 19 unsigned int wifi_var = 0;
defrost 2:7abdaa5a9209 20 unsigned int ADCRaw;
defrost 0:c5607b31fb07 21
defrost 0:c5607b31fb07 22 // Set the IoT ID:
defrost 0:c5607b31fb07 23 IoT_ID = 1;
defrost 0:c5607b31fb07 24
defrost 0:c5607b31fb07 25 // Send a startup message to serial port:
defrost 1:4403f2ed1c1f 26 INFO("");
defrost 1:4403f2ed1c1f 27 INFO("");
defrost 0:c5607b31fb07 28 INFO("Starting up...");
defrost 0:c5607b31fb07 29 INFO("CPU SystemCoreClock is %d Hz", SystemCoreClock);
defrost 0:c5607b31fb07 30
defrost 2:7abdaa5a9209 31 ConfigureADC();
defrost 0:c5607b31fb07 32 SetupNetwork(5000);
defrost 0:c5607b31fb07 33 // Configure the baud rate of the wifi shield:
defrost 0:c5607b31fb07 34 ws.setBaud(115200);
defrost 0:c5607b31fb07 35 wait(0.5f);
defrost 0:c5607b31fb07 36
defrost 0:c5607b31fb07 37
defrost 0:c5607b31fb07 38
defrost 0:c5607b31fb07 39 char msg[128];
defrost 0:c5607b31fb07 40 if(IotStatus.CheckFlag(SF_WIRELESSCONNECTED)){
defrost 0:c5607b31fb07 41 sprintf(msg, "ws://%s:%d/ws", SERVER_IP, WS_PORT);
defrost 0:c5607b31fb07 42 ws.Initialize(msg);
defrost 0:c5607b31fb07 43 INFO("Connecting to Websocket Server on %s...", msg);
defrost 0:c5607b31fb07 44 if(ws.connect()){
defrost 0:c5607b31fb07 45 // Set a status flag:
defrost 0:c5607b31fb07 46 INFO("Connected.");
defrost 0:c5607b31fb07 47 IotStatus.SetFlag(SF_SERVERCONNECTED);
defrost 0:c5607b31fb07 48 }else{
defrost 0:c5607b31fb07 49 // We could not connect right now..
defrost 0:c5607b31fb07 50 IotStatus.ClearFlag(SF_SERVERCONNECTED);
defrost 0:c5607b31fb07 51 INFO("Could not connect to server, will try again later.");
defrost 0:c5607b31fb07 52 ReconnectAttempts++;
defrost 0:c5607b31fb07 53 if(ReconnectAttempts > 5){
defrost 0:c5607b31fb07 54 INFO("Failed after %d reconnect attempts. Resetting the Wifi Shield...", ReconnectAttempts);
defrost 0:c5607b31fb07 55 SetupNetwork(1);
defrost 0:c5607b31fb07 56 ReconnectAttempts = 0;
defrost 0:c5607b31fb07 57 }
defrost 0:c5607b31fb07 58 }
defrost 0:c5607b31fb07 59 }
defrost 0:c5607b31fb07 60
defrost 0:c5607b31fb07 61
defrost 0:c5607b31fb07 62 DisplayTimer.start();
defrost 0:c5607b31fb07 63 // Inifinite loop:
defrost 0:c5607b31fb07 64 while(1) {
defrost 0:c5607b31fb07 65
defrost 0:c5607b31fb07 66 // Process the wifi command:
defrost 0:c5607b31fb07 67 if(wifi_cmd > NO_WIFI_CMD){
defrost 0:c5607b31fb07 68 switch(wifi_cmd){
defrost 0:c5607b31fb07 69 case CHANGEVAR_WIFI_CMD:
defrost 0:c5607b31fb07 70 ModifyVariable(wifi_var, wifi_data);
defrost 0:c5607b31fb07 71 break;
defrost 0:c5607b31fb07 72 default:
defrost 0:c5607b31fb07 73 break;
defrost 0:c5607b31fb07 74 }
defrost 0:c5607b31fb07 75 wifi_cmd = NO_WIFI_CMD;
defrost 0:c5607b31fb07 76 }
defrost 0:c5607b31fb07 77
defrost 0:c5607b31fb07 78 // Check for new wifi data:
defrost 0:c5607b31fb07 79 if((wifi_cmd == NO_WIFI_CMD)){
defrost 0:c5607b31fb07 80 ReceiveNetworkData(&wifi_cmd, &wifi_var, &wifi_data);
defrost 0:c5607b31fb07 81 }
defrost 0:c5607b31fb07 82
defrost 0:c5607b31fb07 83 // Send the network data every 3 seconds:
defrost 0:c5607b31fb07 84 if(DisplayTimer.read()>(3.0f)){
defrost 1:4403f2ed1c1f 85 // Sample the internal temperature sensor:
defrost 1:4403f2ed1c1f 86 STARTADCCONVERSION;
defrost 1:4403f2ed1c1f 87 while(!ADCCONVERSIONCOMPLETE);
defrost 2:7abdaa5a9209 88 ADCRaw = ADC1->DR;
defrost 2:7abdaa5a9209 89 TempSensor = ((((float)ADCRaw)/ADC_MAX)*IT_VMAX - IT_V25)/IT_AVG_SLOPE + 25.0f;
defrost 1:4403f2ed1c1f 90 DBG("TempSensor = %.5f", TempSensor);
defrost 2:7abdaa5a9209 91 DBG("ADC1->DR = %d", ADCRaw);
defrost 0:c5607b31fb07 92
defrost 0:c5607b31fb07 93 // Send data over network:
defrost 0:c5607b31fb07 94 SendNetworkData();
defrost 0:c5607b31fb07 95
defrost 0:c5607b31fb07 96 // Increment a counter:
defrost 0:c5607b31fb07 97 SendCounter++;
defrost 0:c5607b31fb07 98
defrost 0:c5607b31fb07 99 // Reset the timer:
defrost 0:c5607b31fb07 100 DisplayTimer.reset();
defrost 2:7abdaa5a9209 101
defrost 2:7abdaa5a9209 102 if(Led == 1){
defrost 2:7abdaa5a9209 103 Led = 0;
defrost 2:7abdaa5a9209 104 }else{
defrost 2:7abdaa5a9209 105 Led = 1;
defrost 2:7abdaa5a9209 106 }
defrost 0:c5607b31fb07 107 }
defrost 0:c5607b31fb07 108
defrost 0:c5607b31fb07 109
defrost 0:c5607b31fb07 110 }
defrost 0:c5607b31fb07 111 }