Update allcall.py

Tested, it is all functioning well, I created a new decoder since I couldn't understand yours. It may not be the most optimum, I am quite new into coding so it may no be optimal, but for sure it is working :) Hope you like it!

pyModeS/decoder/allcall.py

@@ -1,5 +1,54 @@
+from pyModeS import common
 """
 Decoding all call replies DF=11
-
-[To be implemented]
 """
+
+
+def ipcode(msg):
+    '''Returns the IP code of the Mode S all-call reply (DF11)'''
+    binaryraw=common.hex2bin(msg)
+    PI=binaryraw[-24:]
+    DATA=binaryraw[:-24]
+
+    Gx='1111111111111010000001001000'
+    Mx=DATA[::-1].zfill(len(DATA)+24)[::-1]
+    initialdifference=len(Mx)-len(Gx)
+    Gx = Gx[::-1].zfill(len(Mx))[::-1]
+    while len(Mx)>initialdifference:
+        MSB=Mx[0]
+        if MSB=='1':
+            result=int(Mx,2)^int(Gx,2)
+            Mx = str(bin(result)[2:])
+            Gx = Gx.rstrip('0')[::-1].zfill(len(Mx))[::-1]
+
+        else: #If the Mx starts with a 0
+            Mx=Mx[1:]
+            Gx=Gx[:-1]
+
+    SIcode=(int(Mx,2)^int(PI,2)) #Mx is the parity sequence and PI is the last field of the DF11.
+    return SIcode
+
+
+def capability(msg):
+    '''return the capability code'''
+    if common.df(msg) == 11:#check that the msg is DF11
+        binaryraw=common.hex2bin(msg)
+        CA = (int(binaryraw[5:8],2))
+        if CA == 0: #level 1 transponder
+            return 0
+        if CA in [1, 2,  3]: #reserved
+            return None
+        if CA == 4:#level 2 transponder, ability to set CA to 7 and on ground
+            return 4
+        if CA == 5:#level 2 transponder, ability to set CA to 7 and airborn
+            return 5
+        if CA == 6:#level 2 transponder, ability to set CA to 7 and either airborn on ground
+            return 6
+        if CA == 7:# (either DR field is 0 or FS field is 2,3,4 or 5), and either airborn on ground
+            return 7
+    else:
+        raise RuntimeError("Incorrect or inconsistent message types")
+
+def AA(msg):
+    '''returns the icao code of the aircraft'''
+    return (msg[2:8])