Add support for CTCSS or DCS on transmit or receive ONLY (#26)

* Add None support for RX or TX CTCSS or DCS

* Improve DCS

* Update README

README.md

@@ -46,6 +46,9 @@ SA818: INFO: +DMOSETVOLUME:0 Volume level: 5
 
 It is possible to specify a different CTCSS or DCS code for transmit and receive by separating the two codes by a comma (no spaces). For example, `--ctcss 100,88.5` will set the CTCSS 100Hz for transmit and 88.5Hz for receive.
 
+> [!NOTE]
+> It is also possible to specify CTCSS or DCS on transmit or receive only. For example, `--ctcss 100,None` will set the CTCSS 100Hz for transmit only (nothing for receive).
+
 ## Usage
 
 This program has for sections:

sa818.py

@@ -32,6 +32,7 @@
 )
 
 DCS_CODES = [
+  "None",
   "023", "025", "026", "031", "032", "036", "043", "047", "051", "053", "054",
   "065", "071", "072", "073", "074", "114", "115", "116", "125", "131", "132",
   "134", "143", "152", "155", "156", "162", "165", "172", "174", "205", "223",
@@ -157,9 +158,11 @@ def set_radio(self, frequency, offset, bw, squelch, ctcss, dcs, tail):
         logger.info(msg, response, bw_label, rx_freq, tx_freq,
                     CTCSS[int(tx_tone)], CTCSS[int(rx_tone)], squelch)
       elif dcs:
-        msg = "%s, BW: %s Frequency (RX: %s / TX: %s), DCD (TX: %s / RX: %s), squelch: %s, OK"
+        tx_tone_display = None if tx_tone == '0000' else tx_tone
+        rx_tone_display = None if rx_tone == '0000' else rx_tone
+        msg = "%s, BW: %s Frequency (RX: %s / TX: %s), DCS (TX: %s / RX: %s), squelch: %s, OK"
         logger.info(msg, response, bw_label, rx_freq, tx_freq,
-                    tx_tone, rx_tone, squelch)
+                    tx_tone_display, rx_tone_display, squelch)
       else:
         msg = "%s, BW: %s, RX frequency: %s, TX frequency: %s, squelch: %s, OK"
         logger.info(msg, response, bw_label, rx_freq, tx_freq, squelch)
@@ -227,15 +230,18 @@ def type_ctcss(parg):
     raise argparse.ArgumentError from None
 
   for code in codes:
-    try:
-      ctcss = str(float(code))
-      if ctcss not in CTCSS:
-        raise ValueError
-      ctcss = CTCSS.index(ctcss)
-      tone_codes.append(f"{ctcss:04d}")
-    except ValueError:
-      logger.error(err_msg)
-      raise argparse.ArgumentTypeError from None
+    if code.lower() == "none":
+      tone_codes.append("0000")  # No CTCSS
+    else:
+      try:
+        ctcss = str(float(code))
+        if ctcss not in CTCSS:
+          raise ValueError
+        ctcss = CTCSS.index(ctcss)
+        tone_codes.append(f"{ctcss:04d}")
+      except ValueError:
+        logger.error(err_msg)
+        raise argparse.ArgumentTypeError from None
 
   return tone_codes
 
@@ -251,19 +257,22 @@ def type_dcs(parg):
     raise argparse.ArgumentError from None
 
   for code in codes:
-    if code[-1] not in ('N', 'I'):
-      logger.error(err_msg)
-      raise argparse.ArgumentError from None
-
-    code, direction = code[:-1], code[-1]
-    try:
-      dcs = f"{int(code):03d}"
-      if dcs not in DCS_CODES:
+    if code.lower() == "none":
+      dcs_codes.append("0000")  # No DCS
+    else:
+      if code[-1] not in ('N', 'I'):
         logger.error(err_msg)
-        raise argparse.ArgumentError
-    except ValueError:
-      raise argparse.ArgumentTypeError from None
-    dcs_codes.append(dcs + direction)
+        raise argparse.ArgumentError from None
+
+      code, direction = code[:-1], code[-1]
+      try:
+        dcs = f"{int(code):03d}"
+        if dcs not in DCS_CODES:
+          logger.error(err_msg)
+          raise argparse.ArgumentError
+      except ValueError:
+        raise argparse.ArgumentTypeError from None
+      dcs_codes.append(dcs + direction)
 
   return dcs_codes