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"}

Diff: main.cpp

Revision:
14:0c353e212296
Parent:
12:7c94ec5069dc
Child:
16:17c5916f2d12
--- a/main.cpp	Tue Jul 12 21:58:17 2016 +0000
+++ b/main.cpp	Wed Jul 13 00:39:08 2016 +0000
@@ -47,6 +47,8 @@
 DigitalOut  mdm_power_on(PTB9);                 // 0 = turn modem on, 1 = turn modem off (should be held high for >5 seconds to cycle modem)
 DigitalOut  mdm_wakeup_in(PTC2);                // 0 = let modem sleep, 1 = keep modem awake -- Note: pulled high on shield
 
+DigitalOut  mdm_reset(PTC12);                   // active high      
+
 DigitalOut  shield_3v3_1v8_sig_trans_ena(PTC4); // 0 = disabled (all signals high impedence, 1 = translation active
 DigitalOut  mdm_uart1_cts(PTD0);
 
@@ -132,9 +134,23 @@
 }
 
 int mdm_init(void) {
-    // disable signal level translator
+    // disable signal level translator (necessary
+    // for the modem to boot properly)
     shield_3v3_1v8_sig_trans_ena = 0;
 
+    // Hard reset the modem (doesn't go through
+    // the signal level translator)
+    mdm_reset = 1;
+    
+   // wait a moment for the modem to react
+    wait_ms(10);
+    
+    // Let modem boot
+    mdm_reset = 0;
+    
+    // wait a moment for the modem to react
+    wait(1.0);
+    
     // power modem on //off
     mdm_power_on = 0; //1;
     
@@ -151,6 +167,13 @@
 
     mdm_uart1_cts = 0;
     
+    // wait a moment for the modem to react to signal
+    // conditions while the level translator is disabled
+    // (sorry, don't have enough information to know
+    // what exactly the modem is doing with the current
+    // pin settings)
+    wait(1.0);
+
     // enable the signal level translator to start
     // modem reset process (modem will be powered down)
     shield_3v3_1v8_sig_trans_ena = 1;
@@ -163,7 +186,7 @@
         const char * rsp_lst[] = { ok_str, error_str, NULL };
         int rc = mdm_sendAtCmd("AT", rsp_lst, 500);
         if (rc == 0)
-            return timer.read();
+            return true; //timer.read();
         wait_ms(1000 - (timer.read_ms() % 1000));
         pc.printf("\r%d",timer.read_ms()/1000);
     }
@@ -332,11 +355,12 @@
 
     // Initialize the modem
     printf(GRN "Modem initializing... will take up to 60 seconds" DEF "\r\n");
-    i=mdm_init();
-    if (!i) {
-        pc.printf(RED "Modem initialization failed!" DEF "\n");
-        while (1);
-    }
+    do {
+        i=mdm_init();
+        if (!i) {
+            pc.printf(RED "Modem initialization failed!" DEF "\n");
+        }
+    } while (!i);
     
     //Software init
     software_init_mdm();