Srdjan Veljkovic
Pubnub demo for AT&T IoT Starter Kit. Functionally similar to the Flow demo.
Dependencies: FXOS8700CQ MODSERIAL mbed
Pubnub demo for AT&T IoT Starter Kit
This demo is functionally similar to the Flow demo, so you can find general information here: https://developer.mbed.org/users/JMF/code/Avnet_ATT_Cellular_IOT/.
The only difference is that we use Pubnub to publish the measurements and subscribe to receiving the instructions to set the LED.
Settings
Pubnub related settings are:
Pubnub settings in `config_me.h`
PUBNUB_SUBSCRIBE_KEY PUBNUB_PUBLISH_KEY PUBNUB_CHANNEL
All are documented in their respective comments.
Pubnub context class
Similar to Pubnub SDKs, we provide a Pubnub context class. It is defined in pubnub.h header file and implemented in pubnub.cpp.
It provides only the fundamental "publish" and "subscribe" methods. They are documented in the header file.
This class is reusable in other code (it is not specific to this demo), it has a very narrow interface to the AT&T IoT cellular modem code. For example of use, you can look at the main() (in main.c).
Sample of published data
Published message w/measurement data
{"serial":"vstarterkit001","temp":89.61,"humidity":35,"accelX":0.97,"accelY":0.013,"accelZ":-0.038}
Don't worry, nobody got burnt, the temperature is in degrees Fahrenheit. :)
Publish a message (from, say, the Pubnub console http://pubnub.com/console) of the form {"LED":<name-of-the-color>} on the channel that this demo listens to (default is hello_world) to turn the LED to that color on the Starter Kit:
Turn LED to red
{"LED":"Red"}
Turn LED to green
{"LED":"Green"}
Turn LED to blue
{"LED":"Blue"}
wnc_control.cpp
- Committer:
- fkellermavnet
- Date:
- 2016-07-22
- Revision:
- 34:1a4498e3580e
- Parent:
- 32:1e052a3e73fe
- Child:
- 36:d4782eabff43
File content as of revision 34:1a4498e3580e:
#include "mbed.h"
#include <cctype>
#include <string>
#include "config_me.h"
#include "SerialBuffered.h"
#include "wnc_control.h"
extern Serial pc;
extern Serial mdm;
extern string MyServerIpAddress;
extern string MySocketData;
int reinitialize_mdm(void);
enum WNC_ERR_e {
WNC_OK =0,
WNC_CMD_ERR = -1,
WNC_NO_RESPONSE = -2
};
// Contains result of last call to send_wnc_cmd(..)
WNC_ERR_e WNC_MDM_ERR = WNC_OK;
// Contains the RAW WNC UART responses
static string wncStr;
static int socketOpen = 0;
void software_init_mdm(void)
{
do
{
WNC_MDM_ERR = WNC_OK;
at_init_wnc();
if (WNC_MDM_ERR == WNC_NO_RESPONSE)
reinitialize_mdm();
} while (WNC_MDM_ERR != WNC_OK);
}
void resolve_mdm(void)
{
do
{
WNC_MDM_ERR = WNC_OK;
at_dnsresolve_wnc(MY_SERVER_URL, &MyServerIpAddress);
if (WNC_MDM_ERR == WNC_NO_RESPONSE)
{
reinitialize_mdm();
software_init_mdm();
}
else if (WNC_MDM_ERR == WNC_CMD_ERR)
{
pc.puts("Bad URL!!!!!!\r\n");
MyServerIpAddress = "192.168.0.1";
WNC_MDM_ERR = WNC_OK;
}
} while (WNC_MDM_ERR != WNC_OK);
pc.printf("My Server IP: %s\r\n", MyServerIpAddress.c_str());
}
void sockopen_mdm(void)
{
do
{
at_at_wnc();
at_at_wnc();
WNC_MDM_ERR = WNC_OK;
at_sockopen_wnc(MyServerIpAddress, MY_PORT_STR);
if (WNC_MDM_ERR == WNC_NO_RESPONSE)
{
reinitialize_mdm();
software_init_mdm();
}
else if (WNC_MDM_ERR == WNC_CMD_ERR)
pc.puts("Socket open fail!!!!\r\n");
else
socketOpen = 1;
} while (WNC_MDM_ERR != WNC_OK);
}
void sockwrite_mdm(const char * s)
{
if (socketOpen == 1)
{
do
{
WNC_MDM_ERR = WNC_OK;
at_sockwrite_wnc(s);
if (WNC_MDM_ERR == WNC_NO_RESPONSE)
{
reinitialize_mdm();
software_init_mdm();
}
else if (WNC_MDM_ERR == WNC_CMD_ERR)
{
pc.puts("Socket Write fail!!!\r\n");
// Have seen when write fails modem gets stuck in bad state, try to recover
reinitialize_mdm();
software_init_mdm();
}
} while (WNC_MDM_ERR != WNC_OK);
}
else
puts("Socket is closed for write!\r\n");
}
unsigned sockread_mdm(string * sockData, int len, int retries)
{
unsigned n = 0;
// Clean slate:
sockData->erase();
if (socketOpen == 1)
{
do
{
WNC_MDM_ERR = WNC_OK;
n = at_sockread_wnc(sockData, len, retries);
if (WNC_MDM_ERR == WNC_NO_RESPONSE)
{
if (n == 0)
{
reinitialize_mdm();
software_init_mdm();
}
else
puts("Sock read partial data!!!\r\n");
}
else if (WNC_MDM_ERR == WNC_CMD_ERR)
puts("Sock read fail!!!!\r\n");
} while (WNC_MDM_ERR == WNC_NO_RESPONSE);
}
else
puts("Socket is closed for read\r\n");
return (n);
}
void sockclose_mdm(void)
{
do
{
WNC_MDM_ERR = WNC_OK;
at_sockclose_wnc();
// Assume close happened even if it went bad
// going bad will result in a re-init anyways and if close
// fails we're pretty much in bad state and not much can do
socketOpen = 0;
if (WNC_MDM_ERR == WNC_NO_RESPONSE)
{
reinitialize_mdm();
software_init_mdm();
}
else if (WNC_MDM_ERR == WNC_CMD_ERR)
puts("Sock close fail!!!\r\n");
} while (WNC_MDM_ERR != WNC_OK);
}
/**
* C++ version 0.4 char* style "itoa":
* Written by Lukás Chmela
* Released under GPLv3.
*/
char* itoa(int value, char* result, int base)
{
// check that the base if valid
if ( base < 2 || base > 36 ) {
*result = '\0';
return result;
}
char* ptr = result, *ptr1 = result, tmp_char;
int tmp_value;
do {
tmp_value = value;
value /= base;
*ptr++ = "zyxwvutsrqponmlkjihgfedcba9876543210123456789abcdefghijklmnopqrstuvwxyz"[35 + (tmp_value - value * base)];
} while ( value );
// Apply negative sign
if ( tmp_value < 0 )
*ptr++ = '-';
*ptr-- = '\0';
while ( ptr1 < ptr ) {
tmp_char = *ptr;
*ptr-- = *ptr1;
*ptr1++ = tmp_char;
}
return result;
}
extern int mdm_sendAtCmdRsp(const char *cmd, const char **rsp_list, int timeout_ms, string * rsp, int * len);
// Sets a global with failure or success, assumes 1 thread all the time
int send_wnc_cmd(const char * s, string ** r, int ms_timeout)
{
static const char * rsp_lst[] = { "OK", "ERROR", NULL };
int len;
pc.printf("Send: %s\r\n",s);
int res = mdm_sendAtCmdRsp(s, rsp_lst, ms_timeout, &wncStr, &len);
*r = &wncStr; // Return a pointer to the static string
if (res >= 0)
{
pc.puts("[");
pc.puts(wncStr.c_str());
pc.puts("]\n\r");
if (res > 0)
{
if (WNC_MDM_ERR != WNC_NO_RESPONSE)
WNC_MDM_ERR = WNC_CMD_ERR;
return -1;
}
else
return 0;
}
else
{
WNC_MDM_ERR = WNC_NO_RESPONSE;
pc.puts("No response from WNC!\n\r");
return -2;
}
}
void at_at_wnc(void)
{
string * pRespStr;
send_wnc_cmd("AT", &pRespStr, WNC_TIMEOUT_MS); // Heartbeat?
}
void at_init_wnc(void)
{
string * pRespStr;
send_wnc_cmd("AT", &pRespStr, WNC_TIMEOUT_MS); // Heartbeat?
send_wnc_cmd("ATE1", &pRespStr, WNC_TIMEOUT_MS); // Echo ON
string cmd_str("AT%PDNSET=1,");
cmd_str += MY_APN_STR;
cmd_str += ",IP";
send_wnc_cmd(cmd_str.c_str(), &pRespStr, 2*WNC_TIMEOUT_MS); // Set APN, cmd seems to take a little longer sometimes
send_wnc_cmd("AT@INTERNET=1", &pRespStr, WNC_TIMEOUT_MS); // Internet services enabled
send_wnc_cmd("AT@SOCKDIAL=1", &pRespStr, WNC_TIMEOUT_MS);
}
void at_sockopen_wnc(const string & ipStr, const char * port )
{
string * pRespStr;
send_wnc_cmd("AT@SOCKCREAT=1", &pRespStr, WNC_TIMEOUT_MS);
string cmd_str("AT@SOCKCONN=1,\"");
cmd_str += ipStr;
cmd_str += "\",";
cmd_str += port;
send_wnc_cmd(cmd_str.c_str(), &pRespStr, WNC_TIMEOUT_MS);
}
void at_sockclose_wnc(void)
{
string * pRespStr;
send_wnc_cmd("AT@SOCKCLOSE=1", &pRespStr, WNC_TIMEOUT_MS);
}
int at_dnsresolve_wnc(const char * s, string * ipStr)
{
string * pRespStr;
string str(s);
str = "AT@DNSRESVDON=\"" + str;
str += "\"\r\n";
if (send_wnc_cmd(str.c_str(), &pRespStr, WNC_TIMEOUT_MS) == 0)
{
size_t pos_start = pRespStr->find(":\"") + 2;
if (pos_start != string::npos)
{
size_t pos_end = pRespStr->rfind("\"") - 1;
if (pos_end != string::npos)
{
if (pos_end > pos_start)
{
// Make a copy for use later (the source string is re-used)
*ipStr = pRespStr->substr(pos_start, pos_end - pos_start + 1);
return 1;
}
else
pc.puts("URL Resolve fail, substr Err\r\n");
}
else
pc.puts("URL Resolve fail, no 2nd quote\r\n");
}
else
pc.puts("URL Resolve fail, no quotes\r\n");
}
else
pc.puts("URL Resolve fail, WNC cmd fail\r\n");
return -1;
}
void at_sockwrite_wnc(const char * s)
{
string * pRespStr;
char num2str[6];
size_t sLen = strlen(s);
if (sLen <= 99999)
{
string cmd_str("AT@SOCKWRITE=1,");
itoa(sLen, num2str, 10);
cmd_str += num2str;
cmd_str += ",\"";
while(*s != '\0')
{
itoa((int)*s++, num2str, 16);
// Always 2-digit ascii hex:
if (strlen(num2str) == 1)
{
num2str[2] = '\0';
num2str[1] = num2str[0];
num2str[0] = '0';
}
cmd_str += num2str;
}
cmd_str += "\"";
send_wnc_cmd(cmd_str.c_str(), &pRespStr, WNC_TIMEOUT_MS);
}
else
pc.puts("sockwrite Err, string to long\r\n");
}
unsigned at_sockread_wnc(string * pS, unsigned n, unsigned retries = 0)
{
unsigned i, numBytes = 0;
string * pRespStr;
string cmd_str("AT@SOCKREAD=1,");
if (n <= 1500)
{
char num2str[6];
itoa(n, num2str, 10);
cmd_str += num2str;
retries += 1;
while (retries--)
{
// Assuming someone is sending then calling this to receive response, invoke
// a pause to give the response some time to come back and then also
// between each retry.
wait_ms(10);
send_wnc_cmd(cmd_str.c_str(), &pRespStr, WNC_TIMEOUT_MS);
size_t pos_start = pRespStr->find("\"") + 1;
size_t pos_end = pRespStr->rfind("\"") - 1;
i = (pos_end - pos_start + 1); // Num hex chars, 2 per byte
if (i > 0)
{
retries = 1; // If any data found retry 1 more time to catch data that might be in another
// WNC payload
string byte;
while (pos_start < pos_end)
{
byte = pRespStr->substr(pos_start, 2);
*pS += (char)strtol(byte.c_str(), NULL, 16);
pos_start += 2;
}
numBytes += i/2;
}
}
return numBytes;
}
else
pc.puts("sockread Err, to many to read\r\n");
return 0;
}