--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/cp_ping.py	Sat Feb 21 20:20:06 2009 +0800
@@ -0,0 +1,59 @@
+import struct
+
+CP_CMD_PING = 1
+CP_CMD_PONG = 2
+
+def csum_add(csum, c):
+    return (((csum << 3) | (csum >> 5)) ^ c) & 0xff
+
+def cp_ping(seq, data):
+    csum = 0
+    csum = csum_add(0, CP_CMD_PING)
+    for c in data:
+        csum = csum_add(csum, ord(c))
+        pass
+    csum = csum_add(csum, 0)
+    
+    cmd_str = struct.pack('BBBBB', ord('J'), ord('C'), seq,
+                          len(data) + 1, CP_CMD_PING)
+    cmd_str = cmd_str + data + chr(csum)
+    return cmd_str
+
+def get_reply(fo):
+    import fcntl, os
+    import time
+    
+    reply = ''
+    fcntl.fcntl(fo.fileno(), fcntl.F_SETFL, os.O_NONBLOCK)
+    while True:
+        try:
+            s = os.read(fo.fileno(), 256)
+        except OSError:
+            time.sleep(0.5)
+            try:
+                s = os.read(fo.fileno(), 256)
+            except OSError:
+                break
+            pass
+        reply = reply + s
+        pass
+    return reply
+
+if __name__ == '__main__':
+    import sys
+
+    if len(sys.argv) != 2:
+        print >> sys.stderr, 'Usage: prog <port device>'
+        sys.exit(1)
+        pass
+    
+    port = sys.argv[1]
+    
+    fo = open(port, 'r+b')
+    cmd_str = cp_ping(0, 'hello')
+    fo.write(cmd_str)
+    fo.flush()
+    
+    reply = get_reply(fo)
+    print repr(reply)
+    pass