diff --git a/proxyclient/addrdump.py b/proxyclient/addrdump.py
index f9806cfe..b1ca9b8b 100755
--- a/proxyclient/addrdump.py
+++ b/proxyclient/addrdump.py
@@ -3,10 +3,7 @@
 import serial, os
 from proxy import *
 
-uartdev = os.environ.get("M1N1DEVICE", "/dev/ttyUSB0")
-usbuart = serial.Serial(uartdev, 115200)
-
-iface = UartInterface(usbuart, debug=False)
+iface = UartInterface()
 proxy = M1N1Proxy(iface, debug=False)
 
 SCRATCH = 0x24F00000
diff --git a/proxyclient/proxy.py b/proxyclient/proxy.py
index a3064504..d369cb81 100755
--- a/proxyclient/proxy.py
+++ b/proxyclient/proxy.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python3
 # SPDX-License-Identifier: MIT
 
-import os, sys, struct
+import os, sys, struct, serial
 from serial.tools.miniterm import Miniterm
 
 def hexdump(s, sep=" "):
@@ -80,8 +80,21 @@ class UartInterface:
     CMD_LEN = 56
     REPLY_LEN = 36
 
-    def __init__(self, device, debug=False):
+    def __init__(self, device=None, debug=False):
         self.debug = debug
+        self.devpath = None
+        if device is None:
+            device = os.environ.get("M1N1DEVICE", "/dev/ttyUSB0:115200")
+        if isinstance(device, str):
+            baud = 115200
+            if ":" in device:
+                device, baud = device.rsplit(":", 1)
+                baud = int(baud)
+            self.devpath = device
+            self.baudrate = baud
+
+            device = serial.Serial(self.devpath, baud)
+
         self.dev = device
         self.dev.timeout = 0
         self.dev.flushOutput()
diff --git a/proxyclient/setup.py b/proxyclient/setup.py
index 59c81fee..fcb58a84 100644
--- a/proxyclient/setup.py
+++ b/proxyclient/setup.py
@@ -3,21 +3,18 @@ from proxy import *
 from tgtypes import *
 from utils import *
 
-uartdev = os.environ.get("M1N1DEVICE", "/dev/ttyUSB0")
-uart = serial.Serial(uartdev, 115200)
-
-iface = UartInterface(uart, debug=False)
+iface = UartInterface()
 p = M1N1Proxy(iface, debug=False)
 
 try:
-    uart.timeout = 0.15
+    iface.dev.timeout = 0.15
     iface.nop()
     p.set_baud(1500000)
 except UartTimeout:
-    uart.baudrate = 1500000
+    iface.dev.baudrate = 1500000
     iface.nop()
 
-uart.timeout = 3
+iface.dev.timeout = 3
 
 u = ProxyUtils(p)
 mon = RegMonitor(u)