diff --git a/ports/nrf/modules/machine/uart.c b/ports/nrf/modules/machine/uart.c
index e8c82e57dd..1fd2ccc06c 100644
--- a/ports/nrf/modules/machine/uart.c
+++ b/ports/nrf/modules/machine/uart.c
@@ -292,6 +292,12 @@ STATIC mp_obj_t machine_hard_uart_sendbreak(mp_obj_t self_in) {
 }
 STATIC MP_DEFINE_CONST_FUN_OBJ_1(machine_hard_uart_sendbreak_obj, machine_hard_uart_sendbreak);
 
+// Since uart.write() waits up to the last byte, uart.txdone() always returns True.
+STATIC mp_obj_t machine_uart_txdone(mp_obj_t self_in) {
+    return mp_const_true;
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_1(machine_uart_txdone_obj, machine_uart_txdone);
+
 STATIC const mp_rom_map_elem_t machine_hard_uart_locals_dict_table[] = {
     // instance methods
     { MP_ROM_QSTR(MP_QSTR_read), MP_ROM_PTR(&mp_stream_read_obj) },
@@ -302,6 +308,8 @@ STATIC const mp_rom_map_elem_t machine_hard_uart_locals_dict_table[] = {
     { MP_ROM_QSTR(MP_QSTR_writechar), MP_ROM_PTR(&machine_hard_uart_writechar_obj) },
     { MP_ROM_QSTR(MP_QSTR_readchar), MP_ROM_PTR(&machine_hard_uart_readchar_obj) },
     { MP_ROM_QSTR(MP_QSTR_sendbreak), MP_ROM_PTR(&machine_hard_uart_sendbreak_obj) },
+    { MP_ROM_QSTR(MP_QSTR_flush), MP_ROM_PTR(&mp_stream_flush_obj) },
+    { MP_ROM_QSTR(MP_QSTR_txdone), MP_ROM_PTR(&machine_uart_txdone_obj) },
 
     // class constants
 /*
@@ -347,6 +355,11 @@ STATIC mp_uint_t machine_hard_uart_write(mp_obj_t self_in, const void *buf_in, m
 STATIC mp_uint_t machine_hard_uart_ioctl(mp_obj_t self_in, mp_uint_t request, uintptr_t arg, int *errcode) {
     machine_hard_uart_obj_t *self = self_in;
     (void)self;
+
+    if (request == MP_STREAM_FLUSH) {
+        // Since uart.write() waits up to the last byte, uart.flush() always succeds.
+        return 0;
+    }
     return MP_STREAM_ERROR;
 }