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You could try to send via service call
. This is a command line example to set 2 parameters:
ros2 service call /your_node/set_parameters rcl_interfaces/srv/SetParameters "{parameters: [{name: "parameter_name", value: {type: 2, integer_value: 2}}, {name: "an_int_value", value: {type: 2, integer_value: 2}}]}"