problem: the project needs to develop 485 serial communication on the android panel. The serial port needs to be monitored after the read command is sent, and the communication is not considered to have failed after N time. Use java s FutureTask with F...
recently, after writing a PLC communication protocol, I sent it a command to read 1 byte after the address 0x0000 (the address 0x0000 exists in PLC, and sent successfully, and the data sent is correct), it should send me 12 bytes (including ACK, site nu...
problem description Open two serial ports at the same time in Android environment, one of them receives the instruction and sends the instruction to the other, but the command of the second serial port will block and often return garbled or the two in...
is using RXTX to write its own communication protocol. At present, one of the problems encountered is: a sends data to B, assuming that the header data of frame I received by B fails to pass, and B requires A to resend, so how can I correctly deal with ...
Where is the elegance of laravel? ...
ask how to define the parent elements of h3PowerH4 as in the following cases: <div class="p1"> <h3>< h3> <h4>< h4> < div> <div class="p2"> <h3>< h3> <h4>< h4> < ...
cannot call translateCallback function to report an error < script type= "text javascript " > API GPS var x = 116.32715863448607; var y = 39.990912172420714; var ggPoint = new BMap.Point(x,y); var bm = new BMap.Map("allmap"); bm.ce...
just now on a whim, F12 opened the browser console when logging in to codeshelper and found that the password was transmitted in plaintext and felt incomprehensible. ...
to visit a website, you need to include the parameter JSESSIONID in cookie. If I copied JSESSIONID directly from the browser, it can be accessed normally. If I use requests.sess to visit this website and pass the JSESSIONID in sess, I will not be able to...