Created basic script for reading stomp data traffic + stomp bytes explained

2 files changed, 84 insertions, 0 deletions

diff --git a/Stomps/README.md b/Stomps/README.md
new file mode 100644
index 0000000..33e23e1
--- /dev/null
+++ b/Stomps/README.md
@@ -0,0 +1,34 @@
+## Stomp message byte examples:
+
+**Action: button | Value: pressed**
+```
+9a e5 01 65 92 bf 0c 00 01 00 11 01 01 00 00 00 9a e5 01 65 92 bf 0c 00 00 00 00 00 00 00 00 00
+```
+
+**Action: button | Value: released**
+```
+9b e5 01 65 4b 74 0b 00 01 00 11 01 00 00 00 00 9b e5 01 65 4b 74 0b 00 00 00 00 00 00 00 00 00
+```
+
+**Action: rotary | Value: clock wise**
+```
+9d e5 01 65 ac 83 04 00 02 00 08 00 01 00 00 00 9d e5 01 65 ac 83 04 00 00 00 00 00 00 00 00 00
+```
+
+**Action: rotary | Value: counter clock**
+```
+9e e5 01 65 40 e8 05 00 02 00 08 00 ff 00 00 00 9e e5 01 65 40 e8 05 00 00 00 00 00 00 00 00 00
+```
+
+It seems that a 32 bytes message is divided into 2 parts of 16 bytes.
+
+### Part 1 (First 16 bytes)
+| 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10     | 11     | 12    | 13      | 14      | 15      |
+|---|---|---|---|---|---|---|---|---|---|--------|--------|-------|---------|---------|---------|
+| time | time | time | time | time | time | time | padding? | action | action | action | action | value | padding | padding | padding |
+
+### Part 1 (First 16 bytes)
+- 0 -> 6 are duplicates
+- 7 -> 15 are padding
+
+From first sight, this part look quite useless. Not sure why it's even there.
\ No newline at end of file
diff --git a/Stomps/read_stomp.py b/Stomps/read_stomp.py
new file mode 100644
index 0000000..516db24
--- /dev/null
+++ b/Stomps/read_stomp.py
@@ -0,0 +1,50 @@
+class StompEvent:
+    def __init__(self, raw_bytes):
+        self.raw_bytes = raw_bytes
+        self.action = "unknown"
+        self.value = "unknown"
+        self.decode_bytes()
+
+    def print_bytes(self):
+        bytes_str = ""
+        for i in range(len(self.raw_bytes)):
+            bytes_str = bytes_str + self.raw_bytes[i].encode('hex') + ' '
+        print bytes_str
+        print '---'*32
+
+    def decode_bytes(self):
+        action_byte_1 = self.raw_bytes[10].encode('hex')
+        action_byte_2 = self.raw_bytes[11].encode('hex')
+        value_byte = self.raw_bytes[12].encode('hex')
+
+        if(action_byte_1 == "11" and action_byte_2 == "01"):
+            self.action = "button"
+        elif(action_byte_1 == "08" and action_byte_2 == "00"):
+            self.action = "rotary"
+
+        if(value_byte == "00"):
+            self.value = "released"
+        elif(value_byte == "01"):
+            if(self.action == "button"):
+                self.value = "pressed"
+            elif(self.action == "rotary"):
+                self.value = "clock wise"
+        elif(value_byte == "ff"):
+            self.value = "counter clock"
+
+    def __str__(self):
+        return "Action: " + self.action + " | Value: " + self.value
+
+with open('/dev/zencoder/knob_stomp2', 'rb') as file:
+    byte_buffer = []
+    while True:
+        byte = file.read(1)
+        if not byte:
+            break
+
+        byte_buffer.append(byte)
+        if len(byte_buffer) is 32:
+            event = StompEvent(byte_buffer)
+            print event
+            event.print_bytes()
+            byte_buffer = []
\ No newline at end of file