Use unique SSRC for scan routine

auto_rx/autorx/__init__.py

@@ -12,7 +12,7 @@
 # MINOR - New sonde type support, other fairly big changes that may result in telemetry or config file incompatability issus.
 # PATCH - Small changes, or minor feature additions.
 
-__version__ = "1.8.0-beta1"
+__version__ = "1.8.0-beta2"
 
 # Global Variables
 

auto_rx/autorx/ka9q.py

@@ -16,17 +16,23 @@
 def ka9q_setup_channel(
     sdr_hostname,
     frequency,
-    sample_rate
+    sample_rate,
+    scan
 ):
+    if scan:
+        ssrc="04"
+    else:
+        ssrc="01"
+
     # tune --samprate 48000 --frequency 404m09 --mode iq --ssrc 404090000 --radio sonde.local
     _cmd = (
         f"{timeout_cmd()} 5 " # Add a timeout, because connections to non-existing servers block for ages
         f"tune "
         f"--samprate {int(sample_rate)} "
         f"--mode iq "
-        f"--low {int(sample_rate) / (-2.4)} --high {int(sample_rate) / 2.4} "
+        f"--low {int(int(sample_rate) / (-2.4))} --high {int(int(sample_rate) / 2.4)} "
         f"--frequency {int(frequency)} "
-        f"--ssrc {round(frequency / 1000)}01 "
+        f"--ssrc {round(frequency / 1000)}{ssrc} "
         f"--radio {sdr_hostname}"
     )
 
@@ -62,16 +68,21 @@ def ka9q_setup_channel(
 
 def ka9q_close_channel(
     sdr_hostname,
-    frequency
+    frequency,
+    scan
 ):
+    if scan:
+        ssrc="04"
+    else:
+        ssrc="01"
 
     _cmd = (
         f"{timeout_cmd()} 5 " # Add a timeout, because connections to non-existing servers block for ages
         f"tune "
         f"--samprate 48000 "
         f"--mode iq "
         f"--frequency 0 "
-        f"--ssrc {round(frequency / 1000)}01 "
+        f"--ssrc {round(frequency / 1000)}{ssrc} "
         f"--radio {sdr_hostname}"
     )
 
@@ -108,11 +119,16 @@ def ka9q_close_channel(
 def ka9q_get_iq_cmd(
         sdr_hostname,
         frequency,
-        sample_rate
+        sample_rate,
+        scan
 ):
+    if scan:
+        ssrc="04"
+    else:
+        ssrc="01"
 
     # We need to setup a channel before we can use it!
-    _setup_success = ka9q_setup_channel(sdr_hostname, frequency, sample_rate)
+    _setup_success = ka9q_setup_channel(sdr_hostname, frequency, sample_rate, scan)
 
     if not _setup_success:
         logging.critical(f"KA9Q ({sdr_hostname}) - Could not setup rx channel! Decoder will likely timeout.")
@@ -124,7 +140,7 @@ def ka9q_get_iq_cmd(
     # -2 option was removed sometime in early 2024.
     _cmd = (
         f"pcmcat "
-        f"-s {round(frequency / 1000)}01 "
+        f"-s {round(frequency / 1000)}{ssrc} "
         f"{_pcm_host} |"
     )
 

auto_rx/autorx/scan.py

@@ -330,7 +330,8 @@ def detect_sonde(
             bias = bias,
             sdr_hostname = sdr_hostname,
             sdr_port = sdr_port,
-            ss_iq_path = ss_iq_path
+            ss_iq_path = ss_iq_path,
+            scan = True
         )
 
         # rx_test_command = (
@@ -436,7 +437,7 @@ def detect_sonde(
         ret_output = ret_output.decode("utf8")
 
         # Release the SDR channel if necessary
-        shutdown_sdr(sdr_type, rtl_device_idx, sdr_hostname, frequency)
+        shutdown_sdr(sdr_type, rtl_device_idx, sdr_hostname, frequency, scan=True)
 
     except subprocess.CalledProcessError as e:
         # dft_detect returns a code of 1 if no sonde is detected.

auto_rx/autorx/sdr_wrappers.py

@@ -245,7 +245,8 @@ def shutdown_sdr(
     sdr_type: str,
     sdr_id: str,
     sdr_hostname = "",
-    frequency: int = None
+    frequency: int = None,
+    scan: bool = False,
     ):
     """
     Function to trigger shutdown/cleanup of some SDR types.
@@ -257,7 +258,7 @@ def shutdown_sdr(
 
     if sdr_type == "KA9Q":
         logging.debug(f"KA9Q - Closing Channel for {sdr_hostname} @ {frequency} Hz.")
-        ka9q_close_channel(sdr_hostname, frequency)
+        ka9q_close_channel(sdr_hostname, frequency, scan)
         pass
     else:
         logging.debug(f"No shutdown action required for SDR type {sdr_type}")
@@ -279,7 +280,8 @@ def get_sdr_iq_cmd(
     bias = False,
     sdr_hostname = "",
     sdr_port = 5555,
-    ss_iq_path = "./ss_iq"
+    ss_iq_path = "./ss_iq",
+    scan = False
 ):
     """
     Get a command-line argument to get IQ (signed 16-bit) from a SDR
@@ -301,6 +303,7 @@ def get_sdr_iq_cmd(
     Arguments for KA9Q SDR Server / SpyServer:
     sdr_hostname (str): Hostname of KA9Q Server
     sdr_port (int): Port number of KA9Q Server
+    scan (bool): Create unique SSRC for scan attempts
 
     Arguments for SpyServer Client:
     ss_iq_path (str): Path to spyserver IQ client utility.
@@ -358,7 +361,7 @@ def get_sdr_iq_cmd(
         return _cmd
 
     if sdr_type == "KA9Q":
-        _cmd = ka9q_get_iq_cmd(sdr_hostname, frequency, sample_rate)
+        _cmd = ka9q_get_iq_cmd(sdr_hostname, frequency, sample_rate, scan)
 
         if dc_block:
             _cmd += _dc_remove