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@3:f20e114eb2ee, 2016-10-04 (annotated)

Committer:
defrost
Date:
Tue Oct 04 16:20:14 2016 +0000
Revision:
3:f20e114eb2ee
Parent:
2:7abdaa5a9209
Child:
5:0c7d131e6089
- Works well with server

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 3:f20e114eb2ee 25 // Set the Auto reconnect flag:
defrost 3:f20e114eb2ee 26 IotStatus.SetFlag(SF_AUTOCONNECT);
defrost 3:f20e114eb2ee 27
defrost 0:c5607b31fb07 28 // Send a startup message to serial port:
defrost 1:4403f2ed1c1f 29 INFO("");
defrost 1:4403f2ed1c1f 30 INFO("");
defrost 0:c5607b31fb07 31 INFO("Starting up...");
defrost 0:c5607b31fb07 32 INFO("CPU SystemCoreClock is %d Hz", SystemCoreClock);
defrost 0:c5607b31fb07 33
defrost 2:7abdaa5a9209 34 ConfigureADC();
defrost 0:c5607b31fb07 35 SetupNetwork(5000);
defrost 0:c5607b31fb07 36 // Configure the baud rate of the wifi shield:
defrost 0:c5607b31fb07 37 ws.setBaud(115200);
defrost 0:c5607b31fb07 38 wait(0.5f);
defrost 0:c5607b31fb07 39
defrost 0:c5607b31fb07 40
defrost 0:c5607b31fb07 41
defrost 0:c5607b31fb07 42 char msg[128];
defrost 0:c5607b31fb07 43 if(IotStatus.CheckFlag(SF_WIRELESSCONNECTED)){
defrost 0:c5607b31fb07 44 sprintf(msg, "ws://%s:%d/ws", SERVER_IP, WS_PORT);
defrost 0:c5607b31fb07 45 ws.Initialize(msg);
defrost 0:c5607b31fb07 46 INFO("Connecting to Websocket Server on %s...", msg);
defrost 0:c5607b31fb07 47 if(ws.connect()){
defrost 0:c5607b31fb07 48 // Set a status flag:
defrost 0:c5607b31fb07 49 INFO("Connected.");
defrost 0:c5607b31fb07 50 IotStatus.SetFlag(SF_SERVERCONNECTED);
defrost 0:c5607b31fb07 51 }else{
defrost 0:c5607b31fb07 52 // We could not connect right now..
defrost 0:c5607b31fb07 53 IotStatus.ClearFlag(SF_SERVERCONNECTED);
defrost 0:c5607b31fb07 54 INFO("Could not connect to server, will try again later.");
defrost 0:c5607b31fb07 55 ReconnectAttempts++;
defrost 0:c5607b31fb07 56 if(ReconnectAttempts > 5){
defrost 0:c5607b31fb07 57 INFO("Failed after %d reconnect attempts. Resetting the Wifi Shield...", ReconnectAttempts);
defrost 0:c5607b31fb07 58 SetupNetwork(1);
defrost 0:c5607b31fb07 59 ReconnectAttempts = 0;
defrost 0:c5607b31fb07 60 }
defrost 0:c5607b31fb07 61 }
defrost 0:c5607b31fb07 62 }
defrost 0:c5607b31fb07 63
defrost 0:c5607b31fb07 64
defrost 3:f20e114eb2ee 65
defrost 0:c5607b31fb07 66 DisplayTimer.start();
defrost 0:c5607b31fb07 67 // Inifinite loop:
defrost 0:c5607b31fb07 68 while(1) {
defrost 0:c5607b31fb07 69
defrost 0:c5607b31fb07 70 // Process the wifi command:
defrost 0:c5607b31fb07 71 if(wifi_cmd > NO_WIFI_CMD){
defrost 0:c5607b31fb07 72 switch(wifi_cmd){
defrost 0:c5607b31fb07 73 case CHANGEVAR_WIFI_CMD:
defrost 0:c5607b31fb07 74 ModifyVariable(wifi_var, wifi_data);
defrost 0:c5607b31fb07 75 break;
defrost 0:c5607b31fb07 76 default:
defrost 0:c5607b31fb07 77 break;
defrost 0:c5607b31fb07 78 }
defrost 0:c5607b31fb07 79 wifi_cmd = NO_WIFI_CMD;
defrost 0:c5607b31fb07 80 }
defrost 0:c5607b31fb07 81
defrost 0:c5607b31fb07 82 // Check for new wifi data:
defrost 0:c5607b31fb07 83 if((wifi_cmd == NO_WIFI_CMD)){
defrost 0:c5607b31fb07 84 ReceiveNetworkData(&wifi_cmd, &wifi_var, &wifi_data);
defrost 0:c5607b31fb07 85 }
defrost 0:c5607b31fb07 86
defrost 0:c5607b31fb07 87 // Send the network data every 3 seconds:
defrost 0:c5607b31fb07 88 if(DisplayTimer.read()>(3.0f)){
defrost 1:4403f2ed1c1f 89 // Sample the internal temperature sensor:
defrost 1:4403f2ed1c1f 90 STARTADCCONVERSION;
defrost 1:4403f2ed1c1f 91 while(!ADCCONVERSIONCOMPLETE);
defrost 2:7abdaa5a9209 92 ADCRaw = ADC1->DR;
defrost 2:7abdaa5a9209 93 TempSensor = ((((float)ADCRaw)/ADC_MAX)*IT_VMAX - IT_V25)/IT_AVG_SLOPE + 25.0f;
defrost 1:4403f2ed1c1f 94 DBG("TempSensor = %.5f", TempSensor);
defrost 2:7abdaa5a9209 95 DBG("ADC1->DR = %d", ADCRaw);
defrost 0:c5607b31fb07 96
defrost 0:c5607b31fb07 97 // Send data over network:
defrost 0:c5607b31fb07 98 SendNetworkData();
defrost 0:c5607b31fb07 99
defrost 0:c5607b31fb07 100 // Increment a counter:
defrost 0:c5607b31fb07 101 SendCounter++;
defrost 0:c5607b31fb07 102
defrost 0:c5607b31fb07 103 // Reset the timer:
defrost 0:c5607b31fb07 104 DisplayTimer.reset();
defrost 2:7abdaa5a9209 105
defrost 0:c5607b31fb07 106 }
defrost 0:c5607b31fb07 107
defrost 0:c5607b31fb07 108
defrost 0:c5607b31fb07 109 }
defrost 0:c5607b31fb07 110 }