zigbee-herdsman
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    Variable TX_POOL_BUFFERSConst

    TX_POOL_BUFFERS: number = ...

    The number of transmit buffers must be set to the number of receive buffers -- to hold the immediate ACKs sent for each callabck frame received -- plus 3 buffers for the retransmit queue and one each for an automatic ACK (due to data flow control) and a command.