ELINK_FLOW_CTRL_BOTH
phy->req_flow_ctrl = ELINK_FLOW_CTRL_BOTH;
case ELINK_FLOW_CTRL_BOTH:
case ELINK_FLOW_CTRL_BOTH:
vars->flow_ctrl = ELINK_FLOW_CTRL_BOTH;
u16_t req_fc_auto_adv = ELINK_FLOW_CTRL_BOTH;