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import hashlib
from typing import Optional
from .._payload import MqttPayload
from .._node import MqttModule, MqttNode
MODULE_NAME = 'MqttOtaModule'
class OtaResultPayload(MqttPayload):
FORMAT = '=BB'
result: int
error_code: int
class OtaPayload(MqttPayload):
secret: str
filename: str
# structure of returned data:
#
# uint8_t[len(secret)] secret;
# uint8_t[16] md5;
# *uint8_t data
def pack(self):
buf = bytearray(self.secret.encode())
m = hashlib.md5()
with open(self.filename, 'rb') as fd:
content = fd.read()
m.update(content)
buf.extend(m.digest())
buf.extend(content)
return buf
def unpack(cls, buf: bytes):
raise RuntimeError(f'{cls.__class__.__name__}.unpack: not implemented')
# secret = buf[:12].decode()
# filename = buf[12:].decode()
# return OTAPayload(secret=secret, filename=filename)
class MqttOtaModule(MqttModule):
_ota_request: Optional[tuple[str, int]]
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
self._ota_request = None
def on_connect(self, mqtt: MqttNode):
super().on_connect(mqtt)
mqtt.subscribe_module("otares", self)
if self._ota_request is not None:
filename, qos = self._ota_request
self._ota_request = None
self.do_push_ota(self._mqtt_node_ref.secret, filename, qos)
def handle_payload(self, mqtt: MqttNode, topic: str, payload: bytes) -> Optional[MqttPayload]:
if topic == 'otares':
message = OtaResultPayload.unpack(payload)
self._logger.debug(message)
return message
def do_push_ota(self, secret: str, filename: str, qos: int):
payload = OtaPayload(secret=secret, filename=filename)
self._mqtt_node_ref.publish('ota',
payload=payload.pack(),
qos=qos)
def push_ota(self,
filename: str,
qos: int):
if not self._initialized:
self._ota_request = (filename, qos)
else:
self.do_push_ota(self._mqtt_node_ref.secret, filename, qos)
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