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:
17:38a8cc0c6ba5
Parent:
16:17c5916f2d12
Child:
18:b08471eb1d1c
--- a/main.cpp	Wed Jul 13 06:10:58 2016 +0000
+++ b/main.cpp	Wed Jul 13 15:48:37 2016 +0000
@@ -135,51 +135,39 @@
 }
 
 int mdm_init(void) {
-    // 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
+
+    // disable signal level translator (necessary
+    // for the modem to boot properly).  All signals
+    // except mdm_reset go through the level translator
+    // and have internal pull-up/down in the module. While
+    // the level translator is disabled, these pins will
+    // be in the correct state.  
+    shield_3v3_1v8_sig_trans_ena = 0;
+
+    // While the level translator is disabled and ouptut pins
+    // are tristated, make sure the inputs are in the same state
+    // as the WNC Module pins so that when the level translator is
+    // enabled, there are no differences.
+    mdm_uart2_rx_boot_mode_sel = 1;   // UART2_RX should be high
+    mdm_power_on = 0;                 // powr_on should be low
+    mdm_wakeup_in = 1;                // wake-up should be high
+    mdm_uart1_cts = 0;                // indicate that it is ok to send
+
+   // Now, wait for the WNC Module to perform its initial boot correctly
     wait(1.0);
-    
-    // power modem on //off
-    mdm_power_on = 0; //1;
-    
-    // insure modem boots into normal operating mode
-    // and does not go to sleep when powered on
-    mdm_uart2_rx_boot_mode_sel = 1;
-    mdm_wakeup_in = 1;
+  
+    // The WNC module initializes comms at 115200 8N1 so set it up
+    mdm.baud(115200);
     
-    // initialze comm with the modem
-    mdm.baud(115200);
-    // clear out potential garbage
-    while (mdm.readable())
-      mdm.getc();
+    //Now, enable the level translator, the input pins should now be the
+    //same as how the M14A module is driving them with internal pull ups/downs.
+    //When enabled, there will be no changes in these 4 pins...
+    shield_3v3_1v8_sig_trans_ena = 1;
 
-    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;
-    
-    // Give the modem 60 secons to start responding by
+    // Now, give the modem 60 secons to start responding by
     // sending simple 'AT' commands to modem once per second.
     Timer timer;
     timer.start();