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The code has nothing wrong.

my master on raspberry and nodes on ubuntu system of PC.

Last night I recharge its li baterry and this morning the code works fine.

The problem cannot reappear again, I guess there is 2 possible reason.

  1. Battery is under voltage, so it works well after recharged.
  2. I restart the raspberry device, so the ros system is reset also.

The code has nothing wrong.

my master on raspberry and nodes on ubuntu system of PC.

Last night I recharge its li baterry and this morning the code works fine.

The problem cannot reappear again, I guess there is 2 possible reason.

  1. Battery is under voltage, so it works well after recharged.
  2. I restart the raspberry device, device and Ubuntu system, so the ros system is reset also. also.

The code has nothing wrong.

my master on raspberry and nodes on ubuntu system of PC.

Last night I recharge its the raspberry's li baterry battery and this morning the code works fine.

The problem cannot reappear again, I guess there is 2 possible reason.

  1. Battery is under voltage, so it works well after recharged.
  2. I restart the raspberry device and Ubuntu system, so the ros system is reset also.

The code has nothing wrong.

my master on raspberry and nodes on ubuntu system of PC.

Last night I recharge the raspberry's li battery and this morning the code works fine.

The problem cannot reappear again, I guess there is 2 possible reason.

  1. Battery is under voltage, so it works well after recharged.
  2. I restart the raspberry device and Ubuntu system, so the ros system is reset also.

After I change the master uri, the problem happened. And I restart my ubuntu system, the problem disappeared.