Error: SRSP - SYS - ping after 6000ms
I recently got Error: SRSP - SYS - ping after 6000ms on my CC2351 Zigbee adapter.
As per https://www.zigbee2mqtt.io/guide/installation/20_zigbee2mqtt-fails-to-start.html#error-srsp-sys-ping-after-6000ms - the fix is to reflash the firmware.
Luckily a friend of mine had a CC debugger at hand, and following these instructions got my small Zigbee network back on track in no time.
UPDATE 2023-09-18: I started to get this same error again :( Good that up-do-date CC2652P21 is on its' way, should get it within couple of days.
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Zigbee2mqtt documentation has a good explanation of difference of various chips - read them before buying a new adapter!