Issue(#125, #122): Relocate stopping the AckTimeoutTimer to prevent the node from stucking
Issue(#125, #122): Relocate stopping the AckTimeoutTimer to prevent the node from stucking

imec-idlab/LoRaMac-node,abouillot/LoRaMac-node,imec-idlab/LoRaMac-node,abouillot/LoRaMac-node