ESPNOW is not able to exit the write loop if the peer is not up

[teslawei]

I was trying to stream through ESPNOW, however, I found if the RX peer is not up, the TX will stay in the ESPNOW write loop, repeating the same error message:

[E] Communication.h : 229 - Write error

Not even able to start the retry in the copier process.
I'm not sure if I understand this error wrongly.
In the communication.h, I think the while loop will never exit if the peer is not up.
Because len is always larger than 0;

while (open > 0) {
      if (available_to_write > 0) {
        resetAvailableToWrite();
        size_t send_len = min(open, ESP_NOW_MAX_DATA_LEN);
        esp_err_t rc = esp_now_send(nullptr, data + result, send_len);
        // wait for confirmation
        if (cfg.use_send_ack) {
          while (available_to_write == 0) {
            delay(1);
          }
        } else {
          is_write_ok = true;
        }
        // check status
        if (rc == ESP_OK && is_write_ok) {
          open -= send_len;
          result += send_len;
        } else {
          LOGE("Write error");
                   
        }
        // if we do have no partner to write we stall and retry later
      } else {
        delay(cfg.delay_after_write_ms);
            
      }

      // Wait some time before we retry
      if (!is_write_ok) {
        delay(cfg.delay_after_failed_write_ms);
        // LOGI("write ok? %d\n", is_write_ok);
      }
      // if (retry <cfg.retry)
      // {
      //   retry ++;
      //   LOGI("retry num is: %d", retry);
      // } else {
      //   break;
      // }
    }

[pschatzmann]

In the ESPNowStreamConfig you can set the write_retry_count parameter to a value > 0