diff --git a/.gitignore b/.gitignore
index c02743a..8413829 100644
--- a/.gitignore
+++ b/.gitignore
@@ -22,8 +22,10 @@ build-common/bleak
 build-common/python-win32*
 # dev config
 config.json
-# traffic dump
+# test files
 *.dump
+*.pf2
+*.pbm
 # some other junk
 .directory
 thumbs.db
diff --git a/.pylintrc b/.pylintrc
index a93dee8..368abe1 100644
--- a/.pylintrc
+++ b/.pylintrc
@@ -17,14 +17,5 @@ disable=broad-except,
         import-outside-toplevel
 
 [BASIC]
-good-names=i,
-           j,
-           k,
-           ex,
-           Run,
-           _,
-           e,
-           do_GET,
-           do_POST,
-           do_HEAD,
-           do_PUT
+good-names=i, j, k, ex, x, y, _, e,
+           Run, do_GET, do_POST, do_HEAD, do_PUT
diff --git a/.vscode/launch.json b/.vscode/launch.json
index 85ee271..8e2be98 100644
--- a/.vscode/launch.json
+++ b/.vscode/launch.json
@@ -4,6 +4,17 @@
     // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
     "version": "0.2.0",
     "configurations": [
+        {
+            "name": "Python: Text Print",
+            "type": "python",
+            "request": "launch",
+            "program": "printer.py",
+            "args": [
+                "-m", "-t", "-d", "-s", "1", "-"
+            ],
+            "console": "integratedTerminal",
+            "justMyCode": true
+        },
         {
             "name": "Python: Current File",
             "type": "python",
diff --git a/additional/pf2.py b/additional/pf2.py
new file mode 100644
index 0000000..1112865
--- /dev/null
+++ b/additional/pf2.py
@@ -0,0 +1,136 @@
+'Python lib to read PF2 font file: http://grub.gibibit.com/New_font_format'
+
+import io
+from typing import Dict, Tuple
+
+def uint32be(b: bytes):
+    'Translate 4 bytes as unsigned big-endian 32-bit int'
+    return (
+        (b[0] << 32) +
+        (b[1] << 16) +
+        (b[2] << 8) +
+        b[3]
+    )
+
+def int32be(b: bytes):
+    'Translate 4 bytes as signed big-endian 32-bit int'
+    u = uint32be(b)
+    return u - ((u >> 31 & 0b1) << 32)
+
+def uint16be(b: bytes):
+    'Translate 2 bytes as big-endian unsigned 16-bit int'
+    return (b[0] << 8) + b[1]
+
+def int16be(b: bytes):
+    'Translate 2 bytes as big-endian signed 16-bit int'
+    u = uint16be(b)
+    return u - ((u >> 15 & 0b1) << 16)
+
+class Character():
+    'A PF2 character'
+
+    width: int
+    height: int
+    x_offset: int
+    y_offset: int
+    device_width: int
+    bitmap_data: bytes
+
+
+class PF2():
+    'The PF2 class, for serializing a PF2 font file'
+
+    is_pf2: bool
+    'Sets to false if the read file is not PF2 font file'
+
+    missing_character_code: int
+    in_memory: bool
+
+    font_name: str
+    family: str
+    weight: str
+    slant: str
+    point_size: int
+    max_width: int
+    max_height: int
+    ascent: int
+    descent: int
+    character_index: Dict[int, Tuple[int, int]]
+    data_offset: int
+    data_io: io.IOBase
+
+    def __init__(self, path='font.pf2', *, read_to_mem=False, missing_character: str='?'):
+        self.missing_character_code = ord(missing_character)
+        self.in_memory = read_to_mem
+        file = open(path, 'rb')
+        self.is_pf2 = (file.read(12) == b'FILE\x00\x00\x00\x04PFF2')
+        if not self.is_pf2:
+            return
+        while True:
+            name = file.read(4)
+            data_length = int32be(file.read(4))
+            if name == b'CHIX':
+                self.character_index = {}
+                for _ in range(data_length // (4 + 1 + 4)):
+                    code_point = int32be(file.read(4))
+                    compression = file.read(1)[0]
+                    offset = int32be(file.read(4))
+                    self.character_index[code_point] = (
+                        compression, offset
+                    )
+                continue
+            elif name == b'DATA':
+                if read_to_mem:
+                    self.data_io = io.BytesIO(file.read())
+                    self.data_offset = -file.tell()
+                    file.close()
+                else:
+                    self.data_io = file
+                    self.data_offset = 0
+                break
+            data = file.read(data_length)
+            if name == b'NAME':
+                self.font_name = data
+            elif name == b'FAMI':
+                self.family = data
+            elif name == b'WEIG':
+                self.weight = data
+            elif name == b'SLAN':
+                self.slant = data
+            elif name == b'PTSZ':
+                self.point_size = uint16be(data)
+            elif name == b'MAXW':
+                self.max_width = uint16be(data)
+            elif name == b'MAXH':
+                self.max_height = uint16be(data)
+            elif name == b'ASCE':
+                self.ascent = uint16be(data)
+            elif name == b'DESC':
+                self.descent = uint16be(data)
+
+    def get_char(self, char: str):
+        'Get a character, returning a `Character` instance'
+        char_point = ord(char)
+        info = self.character_index.get(char_point)
+        if info is None:
+            info = self.character_index[self.missing_character_code]
+        _compression, offset = info
+        data = self.data_io
+        data.seek(offset + self.data_offset)
+        char = Character()
+        char.width = uint16be(data.read(2))
+        char.height = uint16be(data.read(2))
+        char.x_offset = int16be(data.read(2))
+        char.y_offset = int16be(data.read(2))
+        char.device_width = int16be(data.read(2))
+        char.bitmap_data = data.read(
+            (char.width * char.height + 7) // 8
+        )
+        return char
+
+    __getitem__ = get_char
+
+    def close(self):
+        'Close the data IO, if it\'s a real file'
+        if not self.in_memory:
+            self.data_io.close()
diff --git a/build-android/0-build-android.sh b/build-android/0-build-android.sh
index ba2c354..4306364 100755
--- a/build-android/0-build-android.sh
+++ b/build-android/0-build-android.sh
@@ -1,6 +1,6 @@
 #!/bin/sh
 p4a apk --private .. --dist_name="cat-printer" --package="io.github.naitlee.catprinter" --name="Cat Printer" \
-    --icon=icon.png --version="0.1.0" --bootstrap=webview --window --requirements=android,pyjnius,bleak \
+    --icon=icon.png --version="0.1.1" --bootstrap=webview --window --requirements=android,pyjnius,bleak \
     --blacklist-requirements=sqlite3,openssl --port=8095 --arch=arm64-v8a --blacklist="blacklist.txt" \
     --presplash=blank.png --presplash-color=black --add-source="advancedwebview" --orientation=user \
     --permission=BLUETOOTH --permission=BLUETOOTH_SCAN --permission=BLUETOOTH_CONNECT \
diff --git a/build-common/0-bundle-all.sh b/build-common/0-bundle-all.sh
index d57c827..aeba9f6 100755
--- a/build-common/0-bundle-all.sh
+++ b/build-common/0-bundle-all.sh
@@ -1,4 +1,5 @@
 #!/bin/sh
+for i in $(find | grep -E '.*\.pyc'); do rm $i; done
 python3 bundle.py $1
 python3 bundle.py -w $1
 python3 bundle.py -b $1
diff --git a/build-common/bundle.py b/build-common/bundle.py
index 008e10a..29a836c 100644
--- a/build-common/bundle.py
+++ b/build-common/bundle.py
@@ -38,7 +38,9 @@ additional_ignore = (
     '.pylintrc',
     '.gitignore',
     'dev-diary.txt',
-    'TODO'
+    'TODO',
+    # cache
+    '*.pyc',
     # other
     '.directory',
     'thumbs.db',
diff --git a/printer.py b/printer.py
index 6d04503..57025a3 100644
--- a/printer.py
+++ b/printer.py
@@ -119,6 +119,7 @@ class PBMData():
     height: int
     data: bytes
     args: dict
+    'Note: going to put this in `PrinterDriver` in the future'
 
     def __init__(self, width: int, height: int, data: bytes, args: dict = None):
         self.width = width
@@ -134,6 +135,57 @@ class PBMData():
             for arg in args:
                 self.args[arg] = args[arg]
 
+class TextCanvas():
+    'Canvas for text printing, requires PF2 lib'
+    width: int
+    height: int
+    canvas: bytearray = None
+    pf2 = None
+    def __init__(self, width):
+        if self.pf2 is None:
+            from additional.pf2 import PF2
+            self.pf2 = PF2()
+        self.width = width
+        self.height = self.pf2.max_height + self.pf2.descent
+        self.flush_canvas()
+    def flush_canvas(self):
+        'Flush the canvas, returning the canvas data'
+        if self.canvas is None:
+            pbm_data = None
+        else:
+            pbm_data = bytearray(self.canvas)
+        self.canvas = bytearray(self.width * self.height // 8)
+        return pbm_data
+    def puttext(self, text):
+        'Put the specified text to canvas'
+        current_width = 0
+        canvas_length = len(self.canvas)
+        pf2 = self.pf2
+        for i in text:
+            char = pf2[i]
+            if (
+                current_width + char.width + char.x_offset > self.width or
+                i == '\n'
+            ):
+                yield self.flush_canvas()
+                current_width = 0
+            if i in '\n':   # glyphs that should not be printed out
+                continue
+            for x in range(char.width):
+                for y in range(char.height):
+                    target_x = x + char.x_offset
+                    target_y = pf2.ascent + (y - char.height) - char.y_offset
+                    canvas_byte = (self.width * target_y + current_width + target_x) // 8
+                    canvas_bit = 7 - (self.width * target_y + current_width + target_x) % 8
+                    if canvas_byte < 0 or canvas_byte >= canvas_length:
+                        continue
+                    char_byte = (char.width * y + x) // 8
+                    char_bit = 7 - (char.width * y + x) % 8
+                    self.canvas[canvas_byte] |= (
+                        char.bitmap_data[char_byte] & (0b1 << char_bit)
+                    ) >> char_bit << canvas_bit
+            current_width += char.device_width
+        return
 
 class PrinterDriver():
     'Manipulator of the printer'
@@ -152,20 +204,26 @@ class PrinterDriver():
     feed_after = 128
     'Extra paper to feed at the end of printing, by pixel'
 
-    dry_run = False
+    dry_run = None
     'Is dry run (emulate print process but print nothing)'
 
-    standard_width = 384
+    dump = None
+    'Dump the traffic (and PBM image when text printing)?'
+
+    paper_width = 384
     'It\'s a constant for the printer'
 
-    pbm_data_per_line = int(standard_width / 8)  # 48
-    'Constant, determined by standard width & PBM data format'
+    pbm_data_per_line = int(paper_width / 8)  # 48
+    'Determined by paper width & PBM data format'
 
     characteristic = '0000ae01-0000-1000-8000-00805f9b34fb'
     'The BLE characteristic, a constant of the printer'
 
     mtu = 200
 
+    text_canvas: TextCanvas = None
+    'A `TextCanvas` instance'
+
     def __init__(self):
         pass
 
@@ -192,7 +250,7 @@ class PrinterDriver():
                 if line[0:1] != b'#':
                     break
             width, height = [int(x) for x in line.split(b' ')[0:2]]
-            if width != self.standard_width:
+            if width != self.paper_width:
                 raise Exception('PBM image width is not 384px')
             total_height += height
             expected_data_size = self.pbm_data_per_line * height
@@ -205,7 +263,7 @@ class PrinterDriver():
                 result += b'\x00' * expected_data_size
             else:
                 result += raw_data
-        return PBMData(self.standard_width, total_height, result)
+        return PBMData(self.paper_width, total_height, result)
 
     def _pbm_data_to_raw(self, data: PBMData):
         buffer = bytearray()
@@ -254,6 +312,9 @@ class PrinterDriver():
 
     async def send_buffer(self, buffer: bytearray, address: str = None):
         'Send manipulation data (buffer) to the printer via bluetooth'
+        if self.dump:
+            with open('traffic.dump', 'wb') as file:
+                file.write(buffer)
         address = address or self.address
         client = BleakClient(address, timeout=5.0)
         await client.connect()
@@ -316,7 +377,7 @@ class PrinterDriver():
                 if device.name == info:
                     self.name, self.address = device.name, device.address
                     break
-        elif info[2::3] == ':::::':
+        elif info[2::3] == ':::::' or len(info.replace('-', '')) == 32:
             for device in devices:
                 if device.address.lower() == info.lower():
                     self.name, self.address = device.name, device.address
@@ -326,6 +387,27 @@ class PrinterDriver():
             self.name, self.address = device.name, device.address
         return True
 
+    async def print_text(self, file_io: io.IOBase):
+        'Print some text from `file_io`'
+        if self.text_canvas is None:
+            self.text_canvas = TextCanvas(self.paper_width)
+        canvas = self.text_canvas
+        header = b'P4\n%i %i\n'
+        dump = bytearray()
+        current_height = 0
+        while True:
+            text = file_io.readline()
+            if not text:
+                break
+            for data in canvas.puttext(text):
+                if self.dump:
+                    dump += data
+                    current_height += canvas.height
+                    with open('dump.pbm', 'wb') as file:
+                        file.write(header % (canvas.width, current_height))
+                        file.write(dump)
+                await self.print_data(bytearray(header % (canvas.width, canvas.height)) + data)
+
 
 async def _main():
     'Main routine for direct command line execution'
@@ -347,6 +429,10 @@ async def _main():
                         help=i18n['communication-frequency-0.8-or-1-recommended'])
     parser.add_argument('-d', '--dry', required=False, action='store_true',
                         help=i18n['dry-run-test-print-process-only'])
+    parser.add_argument('-m', '--dump', required=False, action='store_true',
+                        help=i18n['dump-the-traffic-to-printer-and-pbm-image-when-text-printing'])
+    parser.add_argument('-t', '--text', required=False, action='store_true',
+                        help=i18n['text-printing-mode-input-text-from-stdin'])
     cmdargs = parser.parse_args()
     addr = cmdargs.address
     printer = PrinterDriver()
@@ -367,9 +453,19 @@ async def _main():
         'name': device.name,
         'address': device.address,
         'frequency': cmdargs.freq,
-        'dry_run': cmdargs.dry
+        'dry_run': cmdargs.dry,
+        'dump': cmdargs.dump
     })
-    await printer.print_file(cmdargs.file)
+    if cmdargs.text:
+        if cmdargs.file == '-':
+            file = sys.stdin
+        else:
+            file = open(cmdargs.file, 'r', encoding='utf-8')
+        await printer.print_text(file)
+        if cmdargs.file != '-':
+            file.close()
+    else:
+        await printer.print_file(cmdargs.file)
     print(i18n['finished'])
 
 
diff --git a/www/lang/en-US.json b/www/lang/en-US.json
index 48749a6..166f517 100644
--- a/www/lang/en-US.json
+++ b/www/lang/en-US.json
@@ -59,6 +59,9 @@
         "path-to-pbm-file-dash-for-stdin": "Path to PBM file. '-' for stdin.",
         "scan-for-specified-seconds": "Scan for specified seconds",
         "specify-printer-mac-address": "Specify printer MAC address",
-        "communication-frequency-0.8-or-1-recommended": "Communication frequency. 0.8 or 1 recommended."
+        "communication-frequency-0.8-or-1-recommended": "Communication frequency. 0.8 or 1 recommended.",
+
+        "dump-the-traffic-to-printer-and-pbm-image-when-text-printing": "Dump the traffic to printer, and PBM image when text printing.",
+        "text-printing-mode-input-text-from-stdin": "Text printing mode, input from stdin."
     }
 }
\ No newline at end of file
diff --git a/www/lang/zh-CN.json b/www/lang/zh-CN.json
index 55229d5..a079ee1 100644
--- a/www/lang/zh-CN.json
+++ b/www/lang/zh-CN.json
@@ -58,6 +58,9 @@
         "path-to-pbm-file-dash-for-stdin": "PBM 文件的位置。“-” 作为标准输入。",
         "scan-for-specified-seconds": "扫描指定的时长。",
         "specify-printer-mac-address": "指定打印机的 MAC 地址",
-        "communication-frequency-0.8-or-1-recommended": "通讯频率。推荐 0.8 或 1。"
+        "communication-frequency-0.8-or-1-recommended": "通讯频率。推荐 0.8 或 1。",
+
+        "dump-the-traffic-to-printer-and-pbm-image-when-text-printing": "转储到打印机的数据，和文字打印模式的 PBM 图像。",
+        "text-printing-mode-input-text-from-stdin": "文字打印模式，将从标准输入读取文字。"
     }
 }
\ No newline at end of file