Serialization issues while sending struct over socket

Question

I am developing a Client/Server based on UDP I want to send different messages to the client from the server. There are different C structures defined for each message.

Answer 1

OP has 2 problems in serializeTask()

for(int i=0; icCnt; i++)
  msg = serialize_int(msg,t->cId[i*4]); [i*4]
...
for(int i=0; idata[i]); strlen(data)

Should be (assuming i should have been idata)

for(int i=0; icCnt; i++)
  msg = serialize_int(msg,t->cId[i]);  // [i]
...
for(int i=0; idata); i++)   // strlen(data) + 1
  msg = serialize_char(msg,t->data[i]);

The first for loop serialize every 4th cId[]. OP certainly wanted to serialize consecutive cId[].
Only the length of the data string was serialized. OP certainly wanted to serialize all that and a NUL terminating byte.

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The data in the posted buffer is more likely the below, which does not match the serialization code. This implies the higher level code populating Task* t is wrong. I am confident that the values seen in fields mType and tkType are either pointers or float, again Task* t is likely amiss before the serialization.

0xb6700300 or -3.576453e-06
0xb6700388 or -3.576484e-06
0xb6700568 or -3.576593e-06
0xb6700568 or -3.576593e-06
0x000000 or 0.000000e+00
0x000000 or 0.000000e+00
0xb67005a8 or -3.576608e-06
0xb67005ac or -3.576609e-06
0xb67005b4 or -3.576611e-06
0xb67005c9 or -3.576615e-06
0xb67005de or -3.576620e-06
0xb67005e6 or -3.576622e-06
0xb67005ee or -3.576624e-06
0xb67005fb or -3.576627e-06
def\0cohorts\0pending_assign_tasks\0pending_assign_tasks\0message\0message\0?\0
...