What is order of communication say and hear between agents?

[cp-lab-uts]

For example, if agent1 say to ask help, agent2 get that and say some information, before hearing this information, agent1 cannot take action.

[cp-lab-uts]

When the agent tries to communicate, there is an error:

Traceback (most recent call last):
File "./example/transferL.py", line 407, in
main()
File "./example/transferL.py", line 326, in main
msg = hfo_env.hear()
File "/home/congcong/.local/lib/python3.6/site-packages/hfo/hfo.py", line 171, in hear
return hfo_lib.hear(self.obj).decode('utf-8')
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xd0 in position 0: invalid continuation byte

[pedMatias]

@congyoubanmian777 I didn't understood your problem. But answering to your question, "hear" should be called after the command "say".
Although, "hear" and "say" shouldn't throw any exception by themselves, per say. I think the problem is more related with the characters that you are using.
I have been using the hear and say commands. If you use "hear" before "say", it should return an empty string