packet

I am trying to use tcpdump to display the content of tcp packets flowing on my network. I have something like: tcpdump -i wlan0 -l -A The -A option displays the content as ASCII text, but my text seems to be UTF-8. Is there a way to display UTF-8 properly using tcpdump? Do you know any other tools which could help? Many thanks Make sure your terminal supports outputting UTF-8 and pipe the output to something which replaces non printable characters: tcpdump -lnpi lo tcp port 80 -s 16000 -w - | tr -t '[^[:print:]]' '' tcpdump -lnpi lo tcp port 80 -s 16000 -w - | strings -e S -n 1 If your

I have two machines which are set up to use Ip-Security and machine A (lets call them A and B) has a socket which is bound to a particular UDP port on the local machine and it polls it frequently to see if anything is received on it. When I disable Ip-security, the data between the two machines goes through fine and I send and receive the packets fine. But when Ip-Security is enabled, the packet doesn't get to that socket on machine A sent by machine B. I do a tcpdump on both the machines and I can see the (encrypted) packet being sent out from machine B and being received on machine A. But

Follow-Up question on Electrical Engineering Stackexchange I want to write the value of a Bluetooth Low Energy characteristic repeatedly in a short amount of time (as a possible use case, imagine a mouse). The characteristic with a 128bit UUID is 20 bytes long. Therefore, it can be written in a single Low Energy transaction. Writes occur at a rate of 50 Hz, that is equal to a write once every 20ms . Therefore, 20 * 50 * 8 = 8 kbit/s are written. I am using the Command / Write without response mode to write the characteristic. Therefore, no acknowledgments happen on the attribute layer. No

Question for C only, C++ and vectors do not solve problem. I have such structure: typedef __packed struct Packet_s { U8 head; U16 len; U32 id; U8 data; U8 end; U16 crc; } Packet_t, *Packet_p; ( EDIT : U8 is uint8_t (unsigned char) and so on) For example, I've received packet(hex): 24 0B 00 07 00 00 00 AA 0D 16 1C where head = 0x24 len = 0x0B 0x00 id = 0x07 0x00 0x00 0x00 data = 0xAA end = 0x0D crc = 0x16 0x1C I can copy it from incoming buffer like this U8 Buffer[SIZE]; // receives all bytes here memcpy(&Packet, &Buffer, buffer_len); and work futher with it. Is it possible to use my structure