But seems in NimBLE max mtu limitted to 256.
Tested in default examlpe bluetooth/nimble/blehr:
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I (35182) NimBLE: mtu update event; conn_handle=0 mtu=256
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I (30086) GATTS_DEMO: ESP_GATTS_MTU_EVT, MTU 500
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I (35182) NimBLE: mtu update event; conn_handle=0 mtu=256
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I (30086) GATTS_DEMO: ESP_GATTS_MTU_EVT, MTU 500
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