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BLE Central disconnect after exactly 65.5 sec


I'm having a problem at the moment with code based on Espruino on nrf52.

I connect as follows:

  ble_gap_scan_params_t     m_scan_param;
  memset(&m_scan_param, 0, sizeof(m_scan_param));       = 1;            // Active scanning set.
  m_scan_param.interval     = MSEC_TO_UNITS(100, UNIT_0_625_MS); // Scan interval.
  m_scan_param.window       = MSEC_TO_UNITS(90, UNIT_0_625_MS); // Scan window.
  m_scan_param.timeout      = 4;            // 4 second timeout.

  ble_gap_conn_params_t   gap_conn_params;
  memset(&gap_conn_params, 0, sizeof(gap_conn_params));
  gap_conn_params.min_conn_interval = MSEC_TO_UNITS(7.5, UNIT_1_25_MS);
  gap_conn_params.max_conn_interval = MSEC_TO_UNITS(500, UNIT_1_25_MS);
  gap_conn_params.slave_latency     = 0;
  gap_conn_params.conn_sup_timeout  = MSEC_TO_UNITS(4000, UNIT_10_MS);

  ble_gap_addr_t addr;
  addr = peer_addr;

  err_code = sd_ble_gap_connect(&addr, &m_scan_param, &gap_conn_params);

Connecting from one device running Espruino to another (both nRF52832DK), and 65.5 seconds after getting a BLE_GAP_EVT_CONNECTED the DK acting as central Espruino gets a BLE_GAP_EVT_DISCONNECTED event. Every time it disconnects, and every time it takes 65.5 seconds.

This doesn't happen when a PC/Android phone acts as Central connecting to a DK, and it doesn't happen when a DK acting as central connects to something else. It's only when one DK connects to another.

Any idea what might be the problem?

If needed I can supply a hex file and the sample code to reproduce this.


Original Sniffer trace (sniffingbroken?): nrf52dk_disconnect.pcapng

Connected, start notifications, send one notification, then it exits

These traces I just connected it and didn't do anything else:

Android nRF Connect -> DK trace (disconnected by me after 70s) : nrf52dk_android.pcapng

iOS nRF Connect -> DK trace (disconnected by me after 70s) : nrf52dk_ios_nrfconnect.pcapng

DK -> DK trace (disconnected itself after 65.5s) : nrf52dk_espruino.pcapng

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