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"}
Diff: wnc_control.cpp
- Revision:
- 2:0e2ef866af95
- Child:
- 10:df54436ecd38
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/wnc_control.cpp Sun Jul 10 00:52:49 2016 +0000
@@ -0,0 +1,331 @@
+#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;
+
+void software_init_mdm(void)
+{
+ do
+ {
+ WNC_MDM_ERR = WNC_OK;
+ at_init_wnc();
+ if (WNC_MDM_ERR != WNC_OK)
+ 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.data());
+}
+
+void sockopen_mdm(void)
+{
+ do
+ {
+ 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");
+ } while (WNC_MDM_ERR != WNC_OK);
+}
+
+void sockwrite_mdm(const char * s)
+{
+ 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);
+}
+
+void sockread_mdm(string * sockData, int len, int retries)
+{
+ do
+ {
+ WNC_MDM_ERR = WNC_OK;
+ at_sockread_wnc(sockData, len, retries);
+ if (WNC_MDM_ERR == WNC_NO_RESPONSE)
+ {
+ reinitialize_mdm();
+ software_init_mdm();
+ }
+ else if (WNC_MDM_ERR == WNC_CMD_ERR)
+ puts("Sock read fail!!!!\r\n");
+ } while (WNC_MDM_ERR != WNC_OK);
+}
+
+void sockclose_mdm(void)
+{
+ do
+ {
+ WNC_MDM_ERR = WNC_OK;
+ at_sockclose_wnc();
+ 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.data());
+ 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_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.data(), &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.data(), &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.data(), &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.data(), &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;
+ 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--)
+ {
+ send_wnc_cmd(cmd_str.data(), &pRespStr, WNC_TIMEOUT_MS);
+ size_t pos_start = pRespStr->find("\"") + 1;
+ size_t pos_end = pRespStr->rfind("\"") - 1;
+ i = pos_end - pos_start + 1;
+ if (i > 0)
+ {
+ retries = 0; // If any data found stop retrying
+ string byte;
+ pS->erase();
+ while (pos_start < pos_end)
+ {
+ byte = pRespStr->substr(pos_start, 2);
+ *pS += (char)strtol(byte.data(), NULL, 16);
+ pos_start += 2;
+ }
+ return i;
+ }
+ }
+ }
+ else
+ pc.puts("sockread Err, to many to read\r\n");
+
+ return 0;
+}