Srdjan Veljkovic / Mbed 2 deprecated Avnet_ATT_Cellular_Pubnub

Pubnub demo for AT&T IoT Starter Kit. Functionally similar to the Flow demo.

Dependencies:   FXOS8700CQ MODSERIAL mbed

http://pubnub.github.io/slides/workshop/pictures/broadcast.png

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"}

Files at this revision

API Documentation at this revision

Revision 48:93a4ab6ac177, committed 2016-07-24

Comitter:
fkellermavnet
Date:
Sun Jul 24 20:18:33 2016 +0000
Parent:
47:c07656706ca1
Parent:
41:9b14c40eebf6
Child:
49:97f823273dc0
Commit message:
Merged (hopefully correctly) Stefan's changes into mine. Also changed it to copy from the C++ string to the char buffer so that the C based JSON parser will work correctly everytime. The latter is what was causing an OS exception when no readback.

Changed in this revision

main.cpp Show annotated file Show diff for this revision Revisions of this file 
--- a/main.cpp	Sun Jul 24 19:54:06 2016 +0000
+++ b/main.cpp	Sun Jul 24 20:18:33 2016 +0000
@@ -353,10 +353,10 @@
     char* endquote;
     beginquote = strchr(search_field, '{'); //start of JSON
     endquote = strchr(search_field, '}'); //end of JSON
-    if (beginquote != 0)
+    if (beginquote)
     {
         uint16_t ifoundlen;
-        if (endquote != 0)
+        if (endquote)
         {
             ifoundlen = (uint16_t) (endquote - beginquote) + 1;
             strncpy(found_string, beginquote, ifoundlen );
@@ -504,32 +504,32 @@
             read_sensors(); //read available external sensors from a PMOD and the on-board motion sensor
             char modem_string[512];
             GenerateModemString(&modem_string[0]);
-            printf(BLU "Sending to modem : %s" DEF "\n", modem_string); 
+            printf(BLU "\r\nSending to modem : %s" DEF "\r\n", modem_string); 
             sockwrite_mdm(modem_string);
             sockread_mdm(&MySocketData, 1024, 20);
-            printf("DONE with READ!\r\n");
-            
-            // If any non-zero response from server, make it GREEN one-time
-            //  then the actual FLOW responses will set the color. 
-            if ((!ledOnce) && (MySocketData.length() > 0))
+         
+            if (sockread_mdm(&MySocketData, 1024, 20))
             {
-                ledOnce = 1;
-                SetLedColor(0x2);
-            }
-            
-            printf(BLU "Read back : %s" DEF "\n", MySocketData.c_str());
-            char myJsonResponse[512];
-            char stringToCharBuf[1501]; // 1500 is the max length WNC can return
-            strcpy(stringToCharBuf, MySocketData.c_str());
-            if (extract_JSON(stringToCharBuf, &myJsonResponse[0]))
-            {
-                printf(GRN "JSON : %s" DEF "\n", &myJsonResponse[0]);
-                parse_JSON(&myJsonResponse[0]);
+                // If any non-zero response from server, make it GREEN one-time
+                //  then the actual FLOW responses will set the color.
+                if (!ledOnce)
+                {
+                    ledOnce = 1;
+                    SetLedColor(0x2);
+                }
+                printf(YEL "Read back : %s" DEF "\r\n", &MySocketData[0]);
+                char myJsonResponse[512];
+                char stringToCharBuf[1501]; // WNC can return max of 1500
+                strcpy(stringToCharBuf, MySocketData.c_str());
+                if (extract_JSON(stringToCharBuf, &myJsonResponse[0]))
+                {
+                    printf(GRN "JSON : %s" DEF "\n", &myJsonResponse[0]);
+                    parse_JSON(&myJsonResponse[0]);
+                }
             }
             else
             {
-                printf(RED "JSON : %s" DEF "\n", &myJsonResponse[0]); //most likely an incomplete JSON string
-                parse_JSON(&myJsonResponse[0]); //This is risky, as the string may be corrupted
+                printf(RED "No response..." DEF "\r\n");
             }
         } //bTimerExpiredFlag
     } //forever loop