Question

可能是一个愚蠢的问题，或者我问的是错误的问题，但这是我正在尝试做的事情。

我使用python作为在LabVIEW和AWS IoT之间进行通信的层。我可以轻松地从LabVIEW调用可与AWS进行通信的python函数；但是，为了通过来自AWS的回调获取消息，我需要保持python脚本运行。但是我知道如何保持它运行的唯一方法是一个无限循环，这使得它不再能够调用python函数。我认为这是一个多线程问题（我不擅长），我可以轻松地运行两个python脚本来执行此操作，但我宁愿让一个python脚本来处理所有问题。

这里有一些虚拟代码可以帮助可视化我正在尝试做的事情：

# This function is called from LabVIEW and sends data
def send_data_to_aws(msg):
    aws_publish(msg)

# This function is a callback from AWS and will get called.
# Even if I am in an infinite loop this function will be called
def callback_func(msg):
    send_to_labview(msg)

... Other AWS code to set up connections with IoT ...

myAWSIoTMQTTClient = AWSIoTMQTTClient(clientId)
myAWSIoTMQTTClient.configureCredentials(groupCA, privateKeyPath, certificatePath)
# This is how the client sets up the callback function.
myAWSIoTMQTTClient.onMessage = callback_func

while True:
    # Just keeping the code alive
    # so the callback function can be called
    # however because of this forever loop send_data_to_aws can no longer be called
    time.sleep(5)

保持Python脚本运行，但允许调用函数

0 个答案: