NEW FEATURE: correct calculation of battery, more status details

Random Protocol Notes.txt

@@ -239,7 +239,7 @@ KR = last bolus reference
 SS = sensor status
 SU = sensor control?
 SC = sensor calibration minutes remaining
-SB = sensor battery
+SB = sensor battery (4 youngest bits)
 SX = sensor rate of change (div 100)
 
 SM = sensor mode active (incs each on and each off, if bit 0 is set then on)
@@ -303,7 +303,8 @@ Sensor/Transmitter:
 
 [SU] 8bit  = ?
 [SC] 16bit = time remaining to next calibration in minutes (720 mins max count, FFFF = unknown)
-[SB] 8bit  = ? unconfirmed as transmitter battery (0x3F 100% ... 0x27 47% . 0x23 20%)
+[SB] 8bit  = 4 youngest bits represent the sensor battery 0x0f = 100%. (0x3F & 0x0F = 0x0F = 100%, 0x27 & 0x0F = 0x07 = 47%, 0x23 & 0x0F = 0x03 = 20%)
+             bit 5 seems always set. bit 4 is only set with 100%.
 [SX] 16bit = isig rate of change? relates to use for trend arrows? (/100 for decimal value) (RATE_OF_CHANGE value in Carelink)
 
 sensor warm-up noted:

read_minimed_next24.py

@@ -583,6 +583,22 @@ def trendArrow( self ):
     @property
     def sensorStatus(self):
         status = int(struct.unpack('>B', self.responsePayload[0x41:0x42])[0])
+        if status == 0x00:
+            return "No sensor"
+        elif status & 0x01 == 0x01:
+            return "Calibrating 0x{:02X}".format(status)
+        elif status & 0x02 == 0x02:
+            return "Calibration complete 0x{:02X}".format(status)
+        elif status & 0x04 == 0x04:
+            return "SG value unavailable 0x{:02X}".format(status)
+        else:
+            return "Unknown sensor status: 0x{:02X}".format(status)
+        return status
+
+    @property
+    def sensorControl(self):
+        status = int(struct.unpack('>B', self.responsePayload[0x42:0x43])[0])
+        return "0x{0:02X} ({0:08b})".format(status)
         return status
 
     @property
@@ -592,7 +608,7 @@ def sensorCalibrationMinutesRemaining(self):
 
     @property
     def sensorBatteryPercent(self):
-        battery_percent = int(struct.unpack('>B', self.responsePayload[0x45:0x46])[0])
+        battery_percent = 100 * (0x0F & int(struct.unpack('>B', self.responsePayload[0x45:0x46])[0])) / 0x0F
         return battery_percent
 
     @property