In this case, connection rules should be created to limit the signal to which clients can connect to the APs. This is possible through access list from option “Range signals”

The issue described with CAPsMAN (Controlled Access Point system Manager) from MikroTik, where mobile devices experience frequent disconnections and reconnections when close to two access points (APs), may be due to several factors related to the roaming configuration, the signal of the APs, or the device's network selection policies.

Here are other possible causes and how to address them:

1. Signal Threshold for Roaming

If the signal threshold for roaming is set too aggressively, a device might try to constantly switch to the AP with the slightly better signal. Adjusting the signal threshold can help devices stay connected to an AP unless the signal difference is significant.

2. RSSI (Received Signal Strength Indicator) Settings

Reviewing the RSSI settings in CAPsMAN can be key. If the RSSI limits are too close together or not configured optimally, it could cause erratic behavior when roaming. Adjusting these limits can help improve connection stability.

3. Interference and Channel Overlay

Interference between channels can cause connectivity problems. Make sure nearby APs are set to channels that minimize interference. Using spectrum analysis tools can help identify the best channels.

4. AP Transmission Power

Very high transmit power on the APs can lead to devices seeing both APs with a strong signal, even if one should be clearly better due to proximity. Adjusting the transmit power to reflect the physical layout of the APs can improve this behavior.

5. Configuring Access List in CAPsMAN

Access Lists in CAPsMAN allow you to control device access to APs based on signal, time, and other criteria. Reviewing and adjusting these settings can improve the AP selection process by devices.

6. Client Device Behavior

Some devices have their own network selection algorithms that may not work well with CAPsMAN roaming logic. In these cases, experimenting with the device's settings or updating its firmware may offer improvements.

Solutions:

• Review and adjust the signal threshold for roaming and RSSI settings.
• Use spectrum analysis tools to optimize channel selection and reduce interference.
• Adjust the transmission power of the APs to reflect the physical distribution and avoid excessively strong signals.
• Properly configure Access Lists in CAPsMAN to improve connection stability.

Resolving roaming issues in an environment with multiple APs requires a careful balance between signal strength, roaming settings, and the physical environment. Experimenting with these settings and monitoring the results can help you find the optimal settings for your network.