From 1cdd4d1d8a1407ac92ae77d50283a4f3c23191d9 Mon Sep 17 00:00:00 2001
From: Andrew Cady <d@jerkface.net>
Date: Fri, 13 Jan 2017 07:43:02 +0000
Subject: Output dexcom connection status

Also output extra debug info with command line option '-v'
---
 dexcom_reader/dexcom_dumper.py | 60 +++++++++++++++++++++++++++++++++---------
 1 file changed, 48 insertions(+), 12 deletions(-)

diff --git a/dexcom_reader/dexcom_dumper.py b/dexcom_reader/dexcom_dumper.py
index 4a14762..9708f36 100644
--- a/dexcom_reader/dexcom_dumper.py
+++ b/dexcom_reader/dexcom_dumper.py
@@ -1,7 +1,8 @@
 import constants
 import readdata
-from sys import stdout
-from datetime import timedelta
+import sys
+from sys import stdout, stderr
+from datetime import timedelta, datetime
 from time import sleep
 
 from optparse import OptionParser
@@ -17,10 +18,12 @@ parser.add_option("-a", "--all",  action="store_const", dest="command", const="d
 parser.add_option("-p", "--poll", action="store_const", dest="command", const="poll",            help="poll for latest CGM record")
 
 parser.add_option("-n", type="int", dest="num_records", default=DEFAULT_PAGE_COUNT, help="number of pages of CGM records to display")
+parser.add_option("-v", "--verbose", action="store_true", dest="verbose", help="verbosity (currently for debugging)")
 
 (options, args) = parser.parse_args()
 
 command = options.command or "dump_cgm"
+VERBOSE = options.verbose
 
 def get_dexcom_reader():
         if options.g5:
@@ -56,33 +59,66 @@ def recent(t):
         now = dr.ReadSystemTime()
         return t.system_time > now - timedelta(minutes=5)
 
+def print_verbose(s):
+        global VERBOSE
+        if VERBOSE:
+                stderr.write('%s\n' % str(s))
+
 def read_recent_egv_data():
-        try:
-                r = dr.ReadRecords('EGV_DATA', options.num_records)[-1]
-                if recent(r) and not r.is_special and not r.display_only:
-                        return r
-                else:
-                        return None
-        except:
-                return None
+       try:
+               r = dr.ReadRecords('EGV_DATA', options.num_records)[-1]
+               if recent(r) and not r.is_special and not r.display_only:
+                       return r
+               else:
+                       return None
+       except ValueError as v:
+               if (v.args[0] == 'Attempting to use a port that is not open'):
+                       return False
+               else:
+                       print_verbose(v)
+                       return None
+       except:
+               print_verbose(sys.exc_info)
+               return None
 
 def format_times(now, stamp):
         diff = (stamp - now).total_seconds()
         operand = '-' if diff < 0 else '+' # should always be -
         return '%s %s %d' % (now.strftime('%s'), operand, abs(diff))
 
+def print_localtime(str):
+        print '%s (system): %s' % (datetime.now().strftime('%s'), str)
+
+CONNECTED = None
+def connected(state):
+        global CONNECTED
+        if (state == CONNECTED):
+                return
+        else:
+                CONNECTED = state
+                print_localtime('dexcom receiver %s connected' % ('is' if state else 'is not'))
+
+def sleep_verbose(n):
+        print_verbose('sleep(%d)' % n)
+        sleep(n)
+
 def poll():
+        print_localtime('dexcom_dumper started')
         while True:
                 r = read_recent_egv_data()
                 if r is None:
-                        sleep(10)
+                        connected(True)
+                        sleep_verbose(10)
+                elif r is False:
+                        connected(False)
+                        sleep_verbose(10)
                 else:
                         now = dr.ReadSystemTime()
                         print '%s: %s %s' % (format_times(now, r.system_time), r.glucose, r.trend_arrow)
                         stdout.flush()
                         next_reading = (r.system_time - now + timedelta(minutes=5, seconds=2)).total_seconds()
                         if (next_reading > 0):
-                                sleep(next_reading)
+                                sleep_verbose(next_reading)
 
 {"dump_everything": dump_everything,
  "dump_cgm":        dump_cgm,
-- 
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