add test conn, add settable attr to

add test connection into enter dunder TextRequestHeader dataclass

name, bitrate and channel for outgoing string requests are now settable.

vban_cmd/dataclass.py

@@ -154,15 +154,24 @@ class RegisterRTHeader:
 @dataclass
 class TextRequestHeader:
     """ VBAN-TEXT request header """
-    name='Command1'
+    name: str
+    bps_index: int
+    channel: int
     vban: bytes='VBAN'.encode()
-    sr: bytes=(0x52).to_bytes(1, 'little')
     nbs: bytes=(0).to_bytes(1, 'little')
-    nbc: bytes=(0).to_bytes(1, 'little')
     bit: bytes=(0x10).to_bytes(1, 'little')
-    streamname: bytes=name.encode() + bytes(16-len(name))
     framecounter: bytes=(0).to_bytes(4, 'little')
 
+    @property
+    def sr(self):
+        return (0x40 + self.bps_index).to_bytes(1, 'little')
+    @property
+    def nbc(self):
+        return (self.channel).to_bytes(1, 'little')
+    @property
+    def streamname(self):
+        return self.name.encode() + bytes(16-len(self.name))
+
     @property
     def header(self):
         header  = self.vban

vban_cmd/vban_cmd.py

@@ -26,13 +26,18 @@ class VbanCmd(abc.ABC):
         self._bps = kwargs['bps']
         self._channel = kwargs['channel']
         self._delay =  kwargs['delay']
-        self._max_polls = kwargs['max_polls']
         self._bps_opts = \
-        [0, 110, 150, 300, 600, 1200, 2400, 4800, 9600, 14400,19200, 31250, 
+        [0, 110, 150, 300, 600, 1200, 2400, 4800, 9600, 14400, 19200, 31250, 
         38400, 57600, 115200, 128000, 230400, 250000, 256000, 460800,921600, 
         1000000, 1500000, 2000000, 3000000]
 
-        self._text_header = TextRequestHeader()
+        if self._channel not in range(256):
+            raise VMCMDErrors('Channel must be in range 0 to 255')
+        self._text_header = TextRequestHeader(
+            name=self._streamname, 
+            bps_index=self._bps_opts.index(self._bps),
+            channel=self._channel
+            )
         self._register_rt_header = RegisterRTHeader()
         self.expected_packet = VBAN_VMRT_Packet_Header()
         self.buff = None
@@ -46,8 +51,13 @@ class VbanCmd(abc.ABC):
         is_error = []
         self.ready_to_read, self.ready_to_write, in_error = select.select(is_readable, is_writable, is_error, 60)
 
-
     def __enter__(self):
+        s =  socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+        res = s.connect_ex((self._ip, self._port))
+        s.close()
+        if res:
+            raise VMCMDErrors('Could not connect to remote Voicemeeter')
+
         self._rt_packet_socket.bind((socket.gethostbyname(socket.gethostname()), self._port))
         worker = Thread(target=self._send_register_rt, daemon=True)
         worker.start()
@@ -64,6 +74,7 @@ class VbanCmd(abc.ABC):
                 sleep(10)
 
     def _fetch_rt_packet(self):
+        if self._rt_packet_socket in self.ready_to_write:
             data, _ = self._rt_packet_socket.recvfrom(1024*1024*2)
             # check for packet data
             if len(data) > HEADER_SIZE:
@@ -106,7 +117,7 @@ class VbanCmd(abc.ABC):
                 data = self._fetch_rt_packet()
             return data
         private_packet = fget()
-        return private_packet if private_packet.__eq__(self.buff) else fget()
+        return private_packet if private_packet == self.buff else fget()
 
     def set_rt(self, id_, param, val):
         cmd = f'{id_}.{param}={val}'
@@ -157,7 +168,7 @@ def _make_remote(kind: NamedTuple) -> VbanCmd:
     def init(self, **kwargs):
         defaultkwargs = {
             'ip': None, 'port': 6990, 'streamname': 'Command1', 'bps': 0, 
-            'channel': 0, 'delay': 0.001, 'max_polls': 2
+            'channel': 0, 'delay': 0.001
             }
         kwargs = defaultkwargs | kwargs
         VbanCmd.__init__(self, **kwargs)