Resolved an issue with the hexlify filter in the device monitor command // Resolve #4732

platformio/device/monitor/command.py

@@ -58,7 +58,7 @@ from platformio.project.options import ProjectOptions
     "--encoding",
     help=(
         "Set the encoding for the serial port "
-        "(e.g. hexlify, Latin1, UTF-8) [default=%s]"
+        "(e.g. hexlify, Latin-1, UTF-8) [default=%s]"
         % ProjectOptions["env.monitor_encoding"].default
     ),
 )

platformio/device/monitor/filters/base.py

@@ -25,11 +25,12 @@ from platformio.project.config import ProjectConfig
 class DeviceMonitorFilterBase(miniterm.Transform):
     def __init__(self, options=None):
         """Called by PlatformIO to pass context"""
-        miniterm.Transform.__init__(self)
+        super().__init__()
 
         self.options = options or {}
         self.project_dir = self.options.get("project_dir")
         self.environment = self.options.get("environment")
+        self._running_terminal = None
 
         self.config = ProjectConfig.get_instance()
         if not self.environment:
@@ -47,6 +48,12 @@ class DeviceMonitorFilterBase(miniterm.Transform):
     def NAME(self):
         raise NotImplementedError("Please declare NAME attribute for the filter class")
 
+    def set_running_terminal(self, terminal):
+        self._running_terminal = terminal
+
+    def get_running_terminal(self):
+        return self._running_terminal
+
 
 def register_filters(platform=None, options=None):
     # project filters

platformio/device/monitor/filters/hexlify.py

@@ -24,12 +24,18 @@ class Hexlify(DeviceMonitorFilterBase):
         super().__init__(*args, **kwargs)
         self._counter = 0
 
+    def set_running_terminal(self, terminal):
+        # force to Latin-1, issue #4732
+        if terminal.input_encoding == "UTF-8":
+            terminal.set_rx_encoding("Latin-1")
+        super().set_running_terminal(terminal)
+
     def rx(self, text):
         result = ""
-        for b in serial.iterbytes(text):
+        for c in serial.iterbytes(text):
             if (self._counter % 16) == 0:
                 result += "\n{:04X} | ".format(self._counter)
-            asciicode = ord(b)
+            asciicode = ord(c)
             if asciicode <= 255:
                 result += "{:02X} ".format(asciicode)
             else:

platformio/device/monitor/terminal.py

@@ -110,6 +110,12 @@ def new_terminal(options):
     term.raw = options["raw"]
     term.set_rx_encoding(options["encoding"])
     term.set_tx_encoding(options["encoding"])
+    for ts in (term.tx_transformations, term.rx_transformations):
+        for t in ts:
+            try:
+                t.set_running_terminal(term)
+            except AttributeError:
+                pass
     return term
 
 

platformio/project/options.py

@@ -549,7 +549,7 @@ ProjectOptions = OrderedDict(
             ConfigEnvOption(
                 group="monitor",
                 name="monitor_encoding",
-                description="Custom encoding (e.g. hexlify, Latin1, UTF-8)",
+                description="Custom encoding (e.g. hexlify, Latin-1, UTF-8)",
                 default="UTF-8",
             ),
             # Library