semi-experimentally, add fallback code for message_to_json, allowing older protobuf library versions

meshtastic/util.py

@@ -675,5 +675,8 @@ def check_if_newer_version() -> Optional[str]:
 
 def message_to_json(message: Message, multiline: bool=False) -> str:
     """Return protobuf message as JSON. Always print all fields, even when not present in data."""
-    json = MessageToJson(message, always_print_fields_with_no_presence=True)
+    try:
+        json = MessageToJson(message, always_print_fields_with_no_presence=True)
+    except TypeError:
+        json = MessageToJson(message, including_default_value_fields=True)
     return stripnl(json) if not multiline else json

pyproject.toml

@@ -9,7 +9,7 @@ readme = "README.md"
 [tool.poetry.dependencies]
 python = "^3.9,<3.14"                                               # 3.9 is needed for pandas, bleak requires <3.14
 pyserial = "^3.5"
-protobuf = ">=5.26.0"
+protobuf = ">=4.21.12"
 dotmap = "^1.3.30"
 pexpect = "^4.9.0"
 pyqrcode = "^1.2.1"
@@ -37,7 +37,7 @@ autopep8 = "^2.1.0"
 pylint = "^3.2.3"
 pyinstaller = "^6.8.0"
 mypy = "^1.10.0"
-mypy-protobuf = "^3.6.0"
+mypy-protobuf = { version = "^3.3.0", optional = true }
 types-protobuf = "^5.26.0.20240422"
 types-tabulate = "^0.9.0.20240106"
 types-requests = "^2.31.0.20240406"