Example showing the ublox Cellular GPS/GNSS module with the online PubNub service on an LPC4088 Experiment Base Board
Dependencies: C027_Support C12832 EALib LM75B MMA7660 PubNub mbed-rtos mbed picojson
PubNubDemo.cpp
- Committer:
- mazgch
- Date:
- 2014-05-13
- Revision:
- 2:5f22df5ec656
- Parent:
- 0:e2c6c039dfbe
- Child:
- 4:84e8940cf7ef
File content as of revision 2:5f22df5ec656:
#include <cstring> #include "mbed.h" #include "C12832.h" #include "MMA7660.h" #include "LM75B.h" #include "picojson.h" #include "PubNub.h" #include "C027.h" #include "MDM.h" //---------------------------------------------------------------------- // You may need to configure these parameters /** Set your secret SIM pin here "1234" */ #define SIMPIN NULL /** The APN of your network operator, sometimes it is "internet" check your contract with the network operator */ #define APN "gprs.swisscom.ch" /** Set the user name for your APN, or NULL if not needed */ #define USERNAME NULL /** Set the password for your APN, or NULL if not needed */ #define PASSWORD NULL C027 c027; /* Demo of PubNub + the mbed application board. */ /* How to get things set up: */ /* 1. Tune in at the PubNub Developer Console, with the following * keys (press Subscribe afterwards): */ const char pubkey[] = "demo"; const char subkey[] = "demo"; const char channel[] = "hello_world2"; /* 2. Attach your mbed board to your computer. A folder should pop up like * if you plug in a USB memory stick. */ /* 3. Open this example in the mbed web IDE and hit the Compile button. */ /* 4. A download popup with a .bin file will appear; save it in the USB * mbed folder. */ /* 5. Press reset button on the mbed to start things up. */ /* You will see the board publish a "status" message that shows its * current temperature and physical tilt. The board's LCD should * print some progress messages regarding that. */ /* You can make the board do things too, by sending messages like: * { "send_status": true } * { "lcd": "Hi there!" } * { "beep": true } * { "rgbled": {"r": 0.5, "g": 1, "b": 0} } * Try it out! Paste these in the Message window and press the send icon. */ Serial pc(USBTX, USBRX); // tx, rx MMA7660 MMA(SDA, SCL); LM75B tmp(SDA, SCL); C12832 lcd(D11, D13, D12, D7, D10); PwmOut led_r(D5); // RGB LED with 3 PWM outputs for dimmer control PwmOut led_g(D9); PwmOut led_b(D8); PwmOut speaker(D6); // Speaker with PWM driver PubNub pn(pubkey, subkey); void status_msg(PubNub &pn) { /* Read sensors. */ float m[3]; MMA.readData(m); float temp = tmp.read(); /* Print on LCD. */ lcd.printf("pub: mx=%.2f, my=%.2f, mz=%.2f, t=%.2f \n", m[0], m[1], m[2], temp); /* Prepare JSON message. */ char jsonmsg[128]; snprintf(jsonmsg, sizeof(jsonmsg), "{\"status\":{\"mx\":%.2f,\"my\":%.2f,\"mz\":%.2f,\"temp\":%.2f}}", m[0], m[1], m[2], temp); #if 0 /* In some rare situations, you might want to instead use picojson * to construct JSON messages, even though it takes a lot of memory: */ printf("%d: ", __LINE__); __heapstats((__heapprt)fprintf, stdout); picojson::value msg(picojson::object_type, false); picojson::object &msgo = msg.get<picojson::object>(); msgo["status"] = picojson::value(picojson::object_type, false); picojson::object &status = msgo["status"].get<picojson::object>(); status["mx"] = picojson::value(double(mx)); status["my"] = picojson::value(double(my)); status["temp"] = picojson::value(temp); strcpy(jsonmsg, msg.serialize().c_str()); printf("%d: ", __LINE__); __heapstats((__heapprt)fprintf, stdout); #endif /* Publish on PubNub. */ PubNubRes ret = pn.publish(channel, jsonmsg); if (ret != PNR_OK) lcd.printf("puberr: %d \n", ret); } void process_msg(PubNub &pn, const char *jsonmsg) { /* Use the picojson parser since we want to deal with complex messages. * If you are short on memory, you can find an example for parsing simple * JSON messages in the PubNub::subscribe() API docs. */ picojson::value msg; std::string err = picojson::parse(msg, jsonmsg, jsonmsg + strlen(jsonmsg)); if (!err.empty()) { lcd.printf("JSON parse: %s \n", err.c_str()); return; } if (msg.get("send_status").get<bool>()) { status_msg(pn); } if (msg.get("lcd").is<std::string>()) { lcd.printf("in: %s \n", msg.get("lcd").get<std::string>().c_str()); } if (msg.get("beep").is<bool>()) { speaker = msg.get("beep").get<bool>() ? 0.5 : 0; } if (msg.get("led").is<picojson::object>()) { picojson::value led = msg.get("led"); if (led.get("r").is<double>()) led_r = 1.0 - led.get("r").get<double>(); if (led.get("g").is<double>()) led_g = 1.0 - led.get("g").get<double>(); if (led.get("b").is<double>()) led_b = 1.0 - led.get("b").get<double>(); } } int main() { /* For debugging, you may find it useful to print memory usage * stats. AvailableMemory may be flaky, but the following is nice. * It will get printed to the USB serial port interface. */ printf("%d: ", __LINE__); __heapstats((__heapprt)fprintf, stdout); /* Generate a 800Hz tone using PWM hardware output */ speaker.period(1.0/800.0); // 800hz period led_r = led_g = led_b = 1.0; // lights out lcd.cls(); lcd.locate(0,0); if (!MMA.testConnection()) lcd.printf("MMA error \n"); // turn on the supplies of the Modem and the GPS c027.mdmPower(true); printf("Modem Initialize\r\n"); MDMSerial mdm; if (!mdm.connect(SIMPIN, APN,USERNAME,PASSWORD, true)) return -1; status_msg(pn); // lcd.printf("pub... "); while (1) { // lcd.printf("sub... "); printf("%d: ", __LINE__); __heapstats((__heapprt)fprintf, stdout); char *reply = NULL; PubNubRes ret = pn.subscribe(channel, &reply); if (ret != PNR_OK) { lcd.printf("suberr: %d \n", ret); wait(1.0); continue; } if (reply) { // lcd.printf("recv(%s)\n", reply); process_msg(pn, reply); } wait(0.5); // avoid busy loop in bad situations } mdm.disconnect(); mdm.powerOff(); c027.mdmPower(false); }